Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Aug. 02, 2019
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	CSTR
Entity Registrant Name	CAPSTAR FINANCIAL HOLDINGS, INC.
Entity Central Index Key	0001676479
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-37886
Entity Tax Identification Number	811527911
Entity Address, Address Line One	1201 Demonbreun Street
Entity Address, Address Line Two	Suite 700
Entity Address, City or Town	Nashville
Entity Address, State or Province	Tennessee
Entity Address, Postal Zip Code	37203
City Area Code	615
Local Phone Number	732-6400
Voting
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		17,428,994
Nonvoting
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		132,561

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 22,621	$ 17,967
Interest-bearing deposits in financial institutions	133,464	76,714
Federal funds sold		10,762
Total cash and cash equivalents	156,085	105,443
Securities available-for-sale, at fair value	194,957	243,808
Securities held-to-maturity, fair value of $3,820, and $3,785 at June 30, 2019 and December 31, 2018, respectively	3,721	3,734
Loans held for sale (includes $37,604 and $0 measured at fair value at June 30, 2019 and December 31, 2018, respectively)	89,629	57,618
Loans	1,440,617	1,429,794
Less allowance for loan losses	(12,903)	(12,113)
Loans, net	1,427,714	1,417,681
Premises and equipment, net	19,503	18,821
Restricted equity securities	14,150	12,038
Accrued interest receivable	6,045	5,964
Goodwill	37,510	37,510
Core deposit intangible, net	7,689	8,538
Other real estate owned, net	914	988
Other assets	60,504	51,740
Total assets	2,018,421	1,963,883
Deposits:
Non-interest-bearing	326,550	289,552
Interest-bearing	491,137	434,921
Savings and money market accounts	508,443	497,108
Time	396,640	348,427
Total deposits	1,722,770	1,570,008
Federal Home Loan Bank advances	10,000	125,000
Other liabilities	22,987	14,496
Total liabilities	1,755,757	1,709,504
Shareholders’ equity:
Series A convertible preferred stock, $1 par value; 5,000,000 shares authorized; 878,049 shares issued and outstanding at June 30, 2019 and December 31, 2018	878	878
Additional paid-in capital	207,873	211,789
Retained earnings	36,165	27,303
Accumulated other comprehensive income (loss), net of income tax	186	(3,316)
Total shareholders’ equity	262,664	254,379
Total liabilities and shareholders’ equity	2,018,421	1,963,883
Voting
Shareholders’ equity:
Common stock	17,429	17,592
Nonvoting
Shareholders’ equity:
Common stock	$ 133	$ 133

Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Securities held to maturity, fair value	$ 3,820,000	$ 3,785,000
Loans held for sale carried at fair value	$ 37,604,000	$ 0
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	878,049	878,049
Preferred stock, shares outstanding	878,049	878,049
Voting
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	17,428,915	17,592,160
Common stock, shares outstanding	17,428,915	17,592,160
Nonvoting
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	132,561	132,561
Common stock, shares outstanding	132,561	132,561

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Loans, including fees	$ 20,999	$ 13,796	$ 41,591	$ 26,030
Securities:
Taxable	1,165	943	2,512	1,823
Tax-exempt	363	257	739	538
Federal funds sold	6	19	25	39
Restricted equity securities	214	128	401	257
Interest-bearing deposits in financial institutions	411	211	857	411
Total interest income	23,158	15,354	46,125	29,098
Interest expense:
Interest-bearing deposits	1,827	892	3,420	1,646
Savings and money market accounts	1,782	1,413	3,500	2,418
Time deposits	2,217	834	4,030	1,483
Federal funds purchased		1	4	1
Securities sold under agreements to repurchase			5
Federal Home Loan Bank advances	324	627	1,156	1,117
Total interest expense	6,150	3,767	12,115	6,665
Net interest income	17,008	11,587	34,010	22,433
Provision for loan losses		169	886	846
Net interest income after provision for loan losses	17,008	11,418	33,124	21,587
Noninterest income:
Noninterest income			4,472	2,695
Net gain (loss) on sale of securities	(121)	3	(108)	3
Tri-Net fees	1,024	325	1,664	853
Other noninterest income	2,229	627	4,128	1,474
Total noninterest income	7,032	2,765	11,767	5,854
Noninterest expense:
Salaries and employee benefits	8,563	6,340	16,995	12,598
Data processing and software	1,862	810	3,336	1,608
Professional fees	501	344	1,043	819
Occupancy	809	535	1,692	1,056
Equipment	1,026	602	1,878	1,141
Regulatory fees	272	233	546	436
Merger related expenses	1,711	335	2,305	335
Amortization of intangibles	419	10	850	20
Other operating	1,307	796	2,551	1,573
Total noninterest expense	16,470	10,005	31,196	19,586
Income before income taxes	7,570	4,178	13,695	7,855
Income tax expense	1,814	665	3,160	1,148
Net income	$ 5,756	$ 3,513	$ 10,535	$ 6,707
Per share information:
Basic net income per share of common stock	$ 0.33	$ 0.30	$ 0.59	$ 0.57
Diluted net income per share of common stock	$ 0.31	$ 0.27	$ 0.56	$ 0.52
Weighted average shares outstanding:
Basic	17,663,992	11,845,822	17,723,286	11,755,535
Diluted	18,650,706	13,067,223	18,740,322	13,021,744
Treasury Management And Other Deposit Service Charges
Noninterest income:
Noninterest income	$ 813	$ 427	$ 1,611	$ 829
Mortgage Banking Income
Noninterest income:
Noninterest income	$ 3,087	$ 1,383	$ 4,472	$ 2,695

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,756	$ 3,513	$ 10,535	$ 6,707
Unrealized gains (losses) on securities available-for-sale:
Unrealized holding gains (losses) arising during the period	2,125	(573)	5,390	(4,927)
Reclassification adjustment for (gains) losses included in net income	121	(3)	108	(3)
Tax effect	(588)	151	(1,438)	1,289
Net of tax	1,658	(425)	4,060	(3,641)
Unrealized losses on securities transferred to held-to-maturity:
Reclassification adjustment for losses included in net income				14
Tax effect				(4)
Net of tax				10
Unrealized gains (losses) on cash flow hedges:
Unrealized holding gains (losses) arising during the period	(461)	144	(701)	567
Reclassification adjustment for losses included in net income	165	224	362	475
Tax effect	(272)	(54)	(219)	(189)
Net of tax	(568)	314	(558)	853
Other comprehensive income (loss)	1,090	(111)	3,502	(2,778)
Comprehensive income	$ 6,846	$ 3,402	$ 14,037	$ 3,929

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock, Voting	Common Stock, Nonvoting	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017	$ 146,946	$ 878	$ 11,450	$ 133	$ 118,120	$ 18,892	$ (2,527)
Beginning balance, shares at Dec. 31, 2017			11,449,465	132,561
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations	(329)		$ 25		(354)
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations, shares			24,729
Stock-based compensation expense	305				305
Exercise of employee common stock options	300		$ 62		238
Exercise of employee common stock options, shares			61,822
Exercise of common stock warrants	942		$ 104		838
Exercise of common stock warrants, shares			104,781
Net income	3,194					3,194
Other comprehensive income (loss)	(2,667)						(2,667)
Ending balance at Mar. 31, 2018	148,691	878	$ 11,641	$ 133	119,147	22,086	(5,194)
Ending balance, shares at Mar. 31, 2018			11,640,797	132,561
Beginning balance at Dec. 31, 2017	146,946	878	$ 11,450	$ 133	118,120	18,892	(2,527)
Beginning balance, shares at Dec. 31, 2017			11,449,465	132,561
Net income	6,707
Other comprehensive income (loss)	(2,778)						(2,778)
Ending balance at Jun. 30, 2018	153,146	878	$ 11,799	$ 133	120,555	25,086	(5,305)
Ending balance, shares at Jun. 30, 2018			11,798,570	132,561
Beginning balance at Mar. 31, 2018	148,691	878	$ 11,641	$ 133	119,147	22,086	(5,194)
Beginning balance, shares at Mar. 31, 2018			11,640,797	132,561
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations	(24)		$ 5		(29)
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations, shares			5,419
Stock-based compensation expense	325				325
Exercise of employee common stock options	897		$ 106		791
Exercise of employee common stock options, shares			106,550
Exercise of common stock warrants	368		$ 47		321
Exercise of common stock warrants, shares			45,804
Common and preferred dividends declared	(513)					(513)
Net income	3,513					3,513
Other comprehensive income (loss)	(111)						(111)
Ending balance at Jun. 30, 2018	153,146	878	$ 11,799	$ 133	120,555	25,086	(5,305)
Ending balance, shares at Jun. 30, 2018			11,798,570	132,561
Beginning balance at Dec. 31, 2018	254,379	878	$ 17,592	$ 133	211,789	27,303	(3,316)
Beginning balance, shares at Dec. 31, 2018			17,592,160	132,561
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations	(168)		$ 14		(182)
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations, shares			13,801
Stock-based compensation expense	344				344
Exercise of employee common stock options	1,180		$ 182		998
Exercise of employee common stock options, shares			182,002
Repurchase of commonstock	(2,431)		$ (155)		(2,276)
Repurchase of common, shares			(155,400)
Common and preferred dividends declared	(744)					(744)
Net income	4,779					4,779
Other comprehensive income (loss)	2,412						2,412
Ending balance at Mar. 31, 2019	259,751	878	$ 17,633	$ 133	210,673	31,338	(904)
Ending balance, shares at Mar. 31, 2019			17,632,563	132,561
Beginning balance at Dec. 31, 2018	$ 254,379	878	$ 17,592	$ 133	211,789	27,303	(3,316)
Beginning balance, shares at Dec. 31, 2018			17,592,160	132,561
Exercise of employee common stock options, shares	218,954
Net income	$ 10,535
Other comprehensive income (loss)	3,502						3,502
Ending balance at Jun. 30, 2019	262,664	878	$ 17,429	$ 133	207,873	36,165	186
Ending balance, shares at Jun. 30, 2019			17,428,915	132,561
Beginning balance at Mar. 31, 2019	259,751	878	$ 17,633	$ 133	210,673	31,338	(904)
Beginning balance, shares at Mar. 31, 2019			17,632,563	132,561
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations	(13)		$ (7)		(6)
Issuance of restricted common stock, net of forfeitures and withholdings to satisfy employee tax obligations, shares			(6,826)
Stock-based compensation expense	340				340
Exercise of employee common stock options	74		$ 23		51
Exercise of employee common stock options, shares			22,778
Repurchase of commonstock	(3,405)		$ (220)		(3,185)
Repurchase of common, shares			(219,600)
Common and preferred dividends declared	(929)					(929)
Net income	5,756					5,756
Other comprehensive income (loss)	1,090						1,090
Ending balance at Jun. 30, 2019	$ 262,664	$ 878	$ 17,429	$ 133	$ 207,873	$ 36,165	$ 186
Ending balance, shares at Jun. 30, 2019			17,428,915	132,561

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 10,535	$ 6,707
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	886	846
Accretion of discounts on acquired loans and deferred fees	(1,106)	(653)
Depreciation and amortization	1,461	205
Net amortization of premiums on investment securities	400	541
Net (gain) loss on sale of securities	108	(3)
Mortgage banking income	$ (4,472)	$ (2,695)
Type of Revenue [Extensible List]	us-gaap:MortgageBankingMember	us-gaap:MortgageBankingMember
Tri-Net fees	$ (1,664)	$ (853)
Net gain on sale of loans	(361)
Net gain on sale of other real estate owned	(3)
Stock-based compensation	684	630
Deferred income tax expense	342	124
Origination of loans held for sale	(327,460)	(261,924)
Proceeds from loans held for sale	301,585	274,245
Net increase in accrued interest receivable and other assets	(10,852)	(464)
Net increase in accrued interest payable and other liabilities	9,655	934
Net cash provided by (used in) operating activities	(20,262)	17,640
Activities in securities available-for-sale:
Purchases	(12,751)	(11,708)
Sales	54,133	5,778
Maturities, prepayments and calls	12,471	9,746
Purchase of restricted equity securities	(2,112)	(3)
Net increase in loans	(9,502)	(98,197)
Purchase of premises and equipment	(1,285)	(132)
Proceeds from sale of other real estate	127
Net cash provided by (used in) investing activities	41,081	(94,516)
Cash flows from financing activities:
Net increase in deposits	152,762	25,147
Proceeds from Federal Home Loan Bank advances	75,000	80,000
Payments on Federal Home Loan Bank advances	(190,000)	(55,000)
Repurchase of common stock	(5,836)
Exercise of common stock options and warrants, net of repurchase of restricted shares	1,073	2,154
Common and preferred stock dividends paid	(1,673)
Termination of interest rate swap agreement	(1,503)
Net cash provided by financing activities	29,823	52,301
Net increase (decrease) in cash and cash equivalents	50,642	(24,575)
Cash and cash equivalents at beginning of period	105,443	82,797
Cash and cash equivalents at end of period	156,085	58,222
Supplemental disclosures of cash paid:
Interest paid	12,294	6,452
Income taxes	251	176
Cash paid for operating lease liabilities	894	809
Supplemental disclosures of noncash transactions:
Transfer of loans to other real estate	50
Loans charged off to the allowance for loan losses	$ 200	251
Dividends declared not paid		$ 513

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

NOTE 1 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited consolidated financial statements as of and for the period ended June 30, 2019 include CapStar Financial Holdings, Inc. and its wholly owned subsidiary, CapStar Bank (the “Bank”, together referred to as the “Company”). Significant intercompany transactions and accounts are eliminated in consolidation.

The accompanying unaudited consolidated financial statements have been prepared in accordance with instructions to Form 10-Q and do not include all information and footnotes required by U.S. generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. All adjustments consisting of normally recurring accruals that, in the opinion of management, are necessary for a fair presentation of the financial position and results of operations for the periods presented have been included. These unaudited consolidated financial statements should be read in conjunction with the Company’s consolidated financial statements and related notes appearing in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, determination of impairment of intangible assets, including goodwill, the valuation of our investment portfolio, loans held for sale, derivative assets and liabilities, deferred tax assets and estimated liabilities.

Loans Held For Sale and Fair Value Option

The Company classifies loans as loans held for sale when originated with the intent to sell. As of April 1, 2019, the Company elected the fair value option for all residential mortgage loans originated with the intent to sell. This election allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting. The Company has not elected the fair value option for other loans held for sale primarily because they are not economically hedged using derivative instruments. The fair value of residential mortgage loans originated with the intent to sell is based on traded market prices of similar assets. Other loans held for sale that are recorded at lower of cost or fair value may be carried at fair value on a nonrecurring basis when the fair value is less than cost. For further information, see Note 13 - Fair Value. The Company does not securitize mortgage loans. If the Company sells loans with servicing rights retained, the carrying value of the mortgage loan sold is reduced by the amount allocated to the servicing right. Fair values of residential mortgage loans held for sale are based on traded market prices of similar assets. The changes in fair value are recorded as a component of mortgage banking income and included gains of $0.9 million for the three and six months ended June 30, 2019. There were no loans held for sale recorded at fair value as of December 31, 2018. The following table summarizes the difference between the fair value and the aggregate unpaid principal balance for residential real estate loans held for sale as of June 30, 2019 (dollars in thousands):

	Fair Value		Aggregate Unpaid Principal Balance		Difference
June 30, 2019
Residential mortgage loans held for sale	$	37,604	$	36,692	$	912

No residential mortgage loans held for sale were greater than 89 days past due or on nonaccrual status as of June 30, 2019 or December 31, 2018.

Subsequent Events

Accounting Standards Codification (“ASC”) 855, Subsequent Events, establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued. The Company evaluated all events or transactions that occurred after June 30, 2019 through the date of the issued financial statements.

Securities

6 Months Ended

Jun. 30, 2019

Investments Debt And Equity Securities [Abstract]

Securities

NOTE 2 – SECURITIES

The amortized cost and fair value of securities available-for-sale and held-to-maturity at June 30, 2019 and December 31, 2018 are summarized as follows (dollars in thousands):

	June 30, 2019									December 31, 2018
	Amortized Cost		Gross unrealized gains		Gross unrealized (losses)			Estimated fair value		Amortized Cost		Gross unrealized gains		Gross unrealized (losses)			Estimated fair value
Securities available-for-sale:
U. S. government agency securities	$	6,491	$	41	$	(55	)	$	6,477	$	11,053	$	—	$	(347	)	$	10,706
State and municipal securities		49,911		1,665		(77	)		51,499		62,142		765		(981	)		61,926
Mortgage-backed securities		124,073		1,552		(785	)		124,840		146,547		776		(3,165	)		144,158
Asset-backed securities		3,402		—		(103	)		3,299		15,437		4		(157	)		15,284
Other debt securities		8,816		68		(42	)		8,842		11,863		71		(200	)		11,734
Total	$	192,693	$	3,326	$	(1,062	)	$	194,957	$	247,042	$	1,616	$	(4,850	)	$	243,808
Securities held-to-maturity:
State and municipal securities	$	3,721	$	99	$	—		$	3,820	$	3,734	$	54	$	(3	)	$	3,785
Total	$	3,721	$	99	$	—		$	3,820	$	3,734	$	54	$	(3	)	$	3,785

Security fair values are established by an independent pricing service as of the dates indicated. The difference between amortized cost and fair value reflects current interest rates and represents the potential gain (loss) had the portfolio been liquidated on those dates. Security gains (losses) are realized only in the event of dispositions prior to maturity or other-than-temporary impairment. Securities with unrealized losses as of June 30, 2019 and December 31, 2018, and the length of time they were in continuous loss positions as of such dates are as follows (dollars in thousands):

	Less than 12 months					12 months or more					Total
June 30, 2019	Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses
U. S. government agency securities	$	—	$	—		$	3,715	$	(55	)	$	3,715	$	(55	)
State and municipal securities		—		—			6,340		(77	)		6,340		(77	)
Mortgage-backed securities		3,002		(7	)		61,711		(778	)		64,713		(785	)
Asset-backed securities		3,299		(103	)		—		—			3,299		(103	)
Other debt securities		985		(15	)		2,489		(27	)		3,474		(42	)
Total temporarily impaired securities	$	7,286	$	(125	)	$	74,255	$	(937	)	$	81,541	$	(1,062	)

December 31, 2018
U. S. government agency securities	$	—	$	—		$	10,706	$	(347	)	$	10,706	$	(347	)
State and municipal securities		13,455		(212	)		17,376		(772	)		30,831		(984	)
Mortgage-backed securities		7,075		(17	)		87,232		(3,148	)		94,307		(3,165	)
Asset-backed securities		8,262		(145	)		2,439		(12	)		10,701		(157	)
Other debt securities		5,362		(200	)		—		—			5,362		(200	)
Total temporarily impaired securities	$	34,154	$	(574	)	$	117,753	$	(4,279	)	$	151,907	$	(4,853	)

As noted in the table above, as of June 30, 2019, the Company had unrealized losses of $1.1 million in its investment securities portfolio. The unrealized losses associated with these investment securities are driven by changes in interest rates and are recorded as a component of equity. These investment securities will continue to be monitored as a part of our ongoing impairment analysis. Management evaluates the financial performance of the issuers on a quarterly basis to determine if it is probable that the issuers can make all contractual principal and interest payments. If a shortfall in future cash flows is identified, a credit loss will be deemed to have occurred and will be recognized as a charge to earnings and a new cost basis for the security will be established. At June 30, 2019 and December 31, 2018, the Company had 59 and 127, respectively of securities in an unrealized loss position.

Because the Company currently does not intend to sell any investment securities that have an unrealized loss at June 30, 2019, and it is not more-likely-than-not that we will be required to sell these investment securities before recovery of their amortized cost bases, which may be at maturity, we do not consider these securities to be other-than-temporarily impaired at June 30, 2019.

Securities with a market value of $80.8 million at June 30, 2019 were pledged to collateralize public deposits, derivative positions and Federal Home Loan Bank advances.

Results from sales of debt and equity securities were as follows (dollars in thousands):

	Six Months Ended			Six Months Ended
	June 30, 2019			June 30, 2018
Proceeds	$	54,133		$	5,778
Gross gains		370			107
Gross losses		(478	)		(104	)

The amortized cost and fair value of securities at June 30, 2019, by contractual maturity, are shown below (dollars in thousands). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

	Available-for-sale				Held-to-maturity
	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Due in less than one year	$	6,794	$	6,870	$	998	$	999
Due one to five years		24,757		25,289		2,723		2,821
Due five to ten years		30,966		32,009		—		—
Due beyond ten years		2,701		2,650		—		—
Mortgage-backed securities		124,073		124,840		—		—
Asset-backed securities		3,402		3,299		—		—
Total	$	192,693	$	194,957	$	3,721	$	3,820

Loans and Allowance for Loan Losses

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

Loans and Allowance for Loan and Lease Losses

NOTE 3 – LOANS AND ALLLOWANCE FOR LOAN LOSSES

A summary of the loan portfolio as of June 30, 2019 and December 31, 2018 follows (dollars in thousands):

	June 30, 2019			December 31, 2018
Commercial real estate	$	594,812		$	550,446
Consumer real estate		255,043			253,562
Construction and land development		123,901			174,670
Commercial and industrial		404,745			404,600
Consumer		26,704			25,615
Other		35,412			20,901
Total		1,440,617			1,429,794
Allowance for loan losses		(12,903	)		(12,113	)
Total loans, net	$	1,427,714		$	1,417,681

The adequacy of the allowance for loan losses (ALL) is assessed at the end of each quarter. The ALL includes a specific component related to loans that are individually evaluated for impairment and a general component related to loans that are segregated into homogeneous pools and collectively evaluated for impairment. The ALL factors applied to these pools are an estimate of probable incurred losses based on management’s evaluation of historical net losses from loans with similar characteristics, which are adjusted by management to reflect current events, trends, and conditions. The adjustments include consideration of the following: changes in lending policies and procedures, economic conditions, nature and volume of the portfolio, experience of lending management, volume and severity of past due loans, quality of the loan review system, value of underlying collateral for collateral dependent loans, concentrations, and other external factors.

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes all commercial loans, and consumer relationships with an outstanding balance greater than $500,000, individually and assigns each loan a risk rating. This analysis is performed on a continual basis by the relationship managers and credit department personnel. On at least an annual basis an independent party performs a formal credit risk review of a sample of the loan portfolio. Among other things, this review assesses the appropriateness of the loan’s risk rating. The Company uses the following definitions for risk ratings:

Special Mention – A special mention asset possesses deficiencies or potential weaknesses deserving of management’s attention. If uncorrected, such weaknesses or deficiencies may expose the Company to an increased risk of loss in the future.

Substandard – A substandard asset is inadequately protected by the current sound net worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if deficiencies are not corrected. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets classified substandard.

Doubtful – A doubtful asset has all weaknesses inherent in one classified substandard, with the added characteristic that weaknesses make collection or liquidation in full, on the basis of existing facts, conditions, and values, highly questionable and improbable. The probability of loss is extremely high, but certain important and reasonable specific pending factors which may work to the advantage and strengthening of the asset exist, therefore, its classification as an estimated loss is deferred until a more exact status may be determined. Pending factors include proposed merger, acquisition or liquidation procedures, capital injection, perfecting liens on additional collateral, and refinancing plans.

Loans not falling into the criteria above are considered to be pass-rated loans. The Company utilizes six loan grades within the pass risk rating.

The following tables present the loan balances by category as well as risk rating (dollars in thousands):

	Non-impaired Loans
June 30, 2019	Pass/Watch		Special Mention		Substandard		Total Non-impaired		Total Impaired Loans		Total
Commercial real estate	$	592,071	$	164	$	1,228	$	593,463	$	1,349	$	594,812
Consumer real estate		250,647		1,677		1,820		254,144		899		255,043
Construction and land development		123,710		50		17		123,777		124		123,901
Commercial and industrial		383,040		10,856		9,531		403,427		1,318		404,745
Consumer		26,661		—		4		26,665		39		26,704
Other		35,412		—		—		35,412		—		35,412
Total	$	1,411,541	$	12,747	$	12,600	$	1,436,888	$	3,729	$	1,440,617

December 31, 2018
Commercial real estate	$	547,616	$	177	$	1,262	$	549,055	$	1,391	$	550,446
Consumer real estate		249,273		1,676		1,691		252,640		922		253,562
Construction and land development		174,591		52		19		174,662		8		174,670
Commercial and industrial		388,719		7,790		6,545		403,054		1,546		404,600
Consumer		25,556		1		27		25,584		31		25,615
Other		20,901		—		—		20,901		—		20,901
Total	$	1,406,656	$	9,696	$	9,544	$	1,425,896	$	3,898	$	1,429,794

None of the Company’s loans had a risk rating of “Doubtful” as of June 30, 2019 or December 31, 2018.

The following tables detail the changes in the ALL for the three and six months ended June 30, 2019 and 2018 (dollars in thousands):

	Commercial real estate		Consumer real estate		Construction and land development			Commercial and industrial			Consumer			Other			Total
Three Months Ended June 30, 2019
Balance, beginning of period	$	3,514	$	1,017	$	2,366		$	5,524		$	139		$	399		$	12,959
Charged-off loans		—		—		—			(26	)		(41	)		(51	)		(118	)
Recoveries		6		13		—			14			22			7			62
Provision for loan losses		402		112		(633	)		6			46			67			—
Balance, end of period	$	3,922	$	1,142	$	1,733		$	5,518		$	166		$	422		$	12,903

Three Months Ended June 30, 2018
Balance, beginning of period	$	3,512	$	1,036	$	1,742		$	7,798		$	122		$	353		$	14,563
Charged-off loans				—		—			(79	)		(12	)		—			(91	)
Recoveries		6		1		—			53			4			—			64
Provision for loan losses		33		20		22			7			6			81			169
Balance, end of period	$	3,551	$	1,057	$	1,764		$	7,779		$	120		$	434		$	14,705

	Commercial real estate		Consumer real estate			Construction and land development			Commercial and industrial			Consumer			Other			Total
Six Months Ended June 30, 2019
Balance, beginning of period	$	3,309	$	1,005		$	2,431		$	5,036		$	105		$	227		$	12,113
Charged-off loans		—		—			—			(26	)		(78	)		(96	)		(200	)
Recoveries		12		16						16			41			19			104
Provision for loan losses		601		121			(698	)		492			98			272			886
Balance, end of period	$	3,922	$	1,142		$	1,733		$	5,518		$	166		$	422		$	12,903

Six Months Ended June 30, 2018
Balance, beginning of period	$	3,324	$	1,063		$	1,628		$	7,209		$	91		$	406		$	13,721
Charged-off loans		—		—			—			(226	)		(25	)		—			(251	)
Recoveries		10		2			—			326			51			—			389
Provision for loan losses		217		(8	)		136			470			3			28			846
Balance, end of period	$	3,551	$	1,057		$	1,764		$	7,779		$	120		$	434		$	14,705

A breakdown of the ALL and the loan portfolio by loan category at June 30, 2019 and December 31, 2018 follows (dollars in thousands):

	Commercial real estate		Consumer real estate		Construction and land development		Commercial and industrial		Consumer		Other		Total
June 30, 2019
Allowance for Loan Losses:
Collectively evaluated for impairment	$	3,922	$	1,142	$	1,733	$	5,348	$	166	$	422	$	12,733
Individually evaluated for impairment		—		—		—		170		—		—		170
Acquired with deteriorated credit quality		—		—		—		—		—		—		—
Balances, end of period	$	3,922	$	1,142	$	1,733	$	5,518	$	166	$	422	$	12,903
Loans:
Collectively evaluated for impairment	$	593,463	$	254,144	$	123,777	$	403,427	$	26,665	$	35,412	$	1,436,888
Individually evaluated for impairment		1,238		213		117		616		8		—		2,192
Acquired with deteriorated credit quality		111		686		7		702		31		—		1,537
Balances, end of period	$	594,812	$	255,043	$	123,901	$	404,745	$	26,704	$	35,412	$	1,440,617

December 31, 2018
Allowance for Loan Losses:
Collectively evaluated for impairment	$	3,309	$	1,005	$	2,431	$	5,036	$	105	$	227	$	12,113
Individually evaluated for impairment		—		—		—		—		—		—		—
Acquired with deteriorated credit quality		—		—		—		—		—		—		—
Balances, end of period	$	3,309	$	1,005	$	2,431	$	5,036	$	105	$	227	$	12,113
Loans:
Collectively evaluated for impairment	$	549,055	$	252,640	$	174,662	$	403,054	$	25,584	$	20,901	$	1,425,896
Individually evaluated for impairment		1,278		183		—		817		—		—		2,278
Acquired with deteriorated credit quality		113		739		8		729		31		—		1,620
Balances, end of period	$	550,446	$	253,562	$	174,670	$	404,600	$	25,615	$	20,901	$	1,429,794

The following table presents the allocation of the ALL for each respective loan category with the corresponding percentage of the ALL in each category to total loans, net of deferred fees as of June 30, 2019 and December 31, 2018 (dollars in thousands):

	June 30, 2019					December 31, 2018
	Amount		Percent of total loans			Amount		Percent of total loans
Commercial real estate	$	3,922		0.27	%	$	3,309		0.23	%
Consumer real estate		1,142		0.08			1,005		0.07
Construction and land development		1,733		0.12			2,431		0.17
Commercial and industrial		5,518		0.39			5,036		0.35
Consumer		166		0.01			105		0.01
Other		422		0.03			227		0.02
Total allowance for loan losses	$	12,903		0.90	%	$	12,113		0.85	%

The following table presents the Company’s impaired loans that were evaluated for specific loss allowance as of June 30, 2019 and December 31, 2018 (dollars in thousands):


	June 30, 2019						December 31, 2018
	Recorded investment		Unpaid principal balance		Related allowance		Recorded investment		Unpaid principal balance		Related allowance
With no related allowance recorded:
Commercial real estate	$	1,349	$	1,416	$	—	$	1,391	$	1,775	$	—
Consumer real estate		899		1,307		—		922		1,204		—
Construction and land development		124		151		—		8		18		—
Commercial and industrial		704		1,478		—		1,546		6,350		—
Consumer		39		68		—		31		56		—
Other		—		—		—		—		—		—
Subtotal		3,115		4,420		—		3,898		9,403		—
With an allowance recorded:
Commercial real estate		—		—		—		—		—		—
Consumer real estate		—		—		—		—		—		—
Construction and land development		—		—		—		—		—		—
Commercial and industrial		614		4,744		170		—		—		—
Consumer		—		—		—		—		—		—
Other		—		—		—		—		—		—
Subtotal		614		4,744		170		—		—		—
Total	$	3,729	$	9,164	$	170	$	3,898	$	9,403	$	—

The following table presents information related to the average recorded investment and interest income recognized on impaired loans for the three and six months ended June 30, 2019 and 2018 (dollars in thousands):

	Three Months Ended				Three Months Ended				Six Months Ended				Six Months Ended
	June 30, 2019				June 30, 2018				June 30, 2019				June 30, 2018
	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
With no related allowance recorded:
Commercial real estate	$	1,356	$	19	$	1,181	$	15	$	1,365	$	35	$	1,189	$	25
Consumer real estate		916		4		—		—		917		4		—		—
Construction and land development		128		1		—		—		128		1		—		—
Commercial and industrial		709		19		—		—		709		19		—		—
Consumer		44		—		—		—		44		—		—		—
Other		—		—		—		—		—		—		—		—
Subtotal		3,153		43		1,181		15		3,163		59		1,189		25
With an allowance recorded:
Commercial real estate		—		—		—		—		—		—		—		—
Consumer real estate		—		—		—		—		—		—		—		—
Construction and land development		—		—		—		—		—		—		—		—
Commercial and industrial		732		—		5,425		31		760		—		5,345		118
Consumer		—		—		—		—		—		—		—		—
Other		—		—		—		—		—		—		—		—
Subtotal		732		—		5,425		31		760		—		5,345		118
Total	$	3,885	$	43	$	6,606	$	46	$	3,923	$	59	$	6,534	$	143

Interest income recognized on a cash basis for impaired loans amounted to $15,000 and $25,000 for the three and six months ended June 30, 2018. No interest income was recognized on a cash basis for impaired loans during the three or six months ended June 30, 2019.

The following table presents the aging of the recorded investment in past-due loans as of June 30, 2019 and December 31, 2018 by class of loans (dollars in thousands):

	30 - 59		60 - 89		Greater Than
	Days		Days		89 Days		Total		Loans Not
	Past Due		Past Due		Past Due		Past Due		Past Due		Total
June 30, 2019
Commercial real estate	$	—	$	1,307	$	—	$	1,307	$	593,505	$	594,812
Consumer real estate		378		947		733		2,058		252,985		255,043
Construction and land development		—		51		—		51		123,850		123,901
Commercial and industrial		89		271		614		974		403,771		404,745
Consumer		161		29		54		245		26,459		26,704
Other		—		—		—		—		35,412		35,412
Total	$	628	$	2,605	$	1,402	$	4,635	$	1,435,982	$	1,440,617

December 31, 2018
Commercial real estate	$	300	$	227	$	—	$	527	$	549,919	$	550,446
Consumer real estate		69		75		775		919		252,643		253,562
Construction and land development		—		—		—		—		174,670		174,670
Commercial and industrial		54		—		—		54		404,546		404,600
Consumer		52		—		43		95		25,520		25,615
Other		—		—		—		—		20,901		20,901
Total	$	475	$	302	$	818	$	1,595	$	1,428,199	$	1,429,794

The following table presents the recorded investment in non-accrual loans, past due loans over 89 days outstanding and accruing and troubled debt restructurings (“TDR”) by class of loans as of June 30, 2019 and December 31, 2018 (dollars in thousands):

	Non-Accrual		Past Due Over 89 Days and Accruing		Troubled Debt Restructurings
June 30, 2019
Commercial real estate	$	—	$	—	$	1,238
Consumer real estate		676		278		—
Construction and land development		124		—		—
Commercial and industrial		616		—		—
Consumer		27		24		—
Other		—		—		—
Total	$	1,443	$	302	$	1,238

December 31, 2018
Commercial real estate	$	—	$	—	$	1,391
Consumer real estate		1,187		214		—
Construction and land development		19		—		—
Commercial and industrial		817		—		—
Consumer		55		—		—
Other		—		—		—
Total	$	2,078	$	214	$	1,391

As of June 30, 2019 and December 31, 2018, all loans classified as nonperforming were deemed to be impaired.

As of June 30, 2019 and December 31, 2018, the Company had a recorded investment in TDR of $1.2 million and $1.4 million, respectively. The Company had no specific allowance for those loans at June 30, 2019 or December 31, 2018 and there were no commitments to lend additional amounts. Loans accounted for as TDR include modifications from original terms such as those due to bankruptcy proceedings, certain modifications of amortization periods or extended suspension of principal payments due to customer financial difficulties. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Bank’s loan policy. Loans accounted for as TDR are individually evaluated for impairment.

There were no new TDR identified during the three or six months ended June 30, 2019 or 2018. There were no TDR for which there was a payment default within twelve months following the modification during the three or six months ended June 30, 2019 or 2018.

A loan is considered to be in payment default once it is 30 days contractually past due under the modified terms.

Acquired Loans

The following table presents changes in the carrying value of purchased credit impaired (“PCI”) loans (in thousands):

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Balance at beginning of period	$	1,608		$	1,620
Change due to payments received and accretion		(71	)		(83	)
Change due to loan charge-offs		—			—
Other		—			—
Balance at end of period	$	1,537		$	1,537

The following table presents changes in the accretable yield for PCI loans (in thousands):

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Balance at beginning of period	$	438		$	440
Accretion		(33	)		(45	)
Reclassification from (to) nonaccretable difference		—			—
Other, net					10
Balance at end of period	$	405		$	405

PCI loans had no impact on the ALL for the three or six months ended June 30, 2019 or 2018.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Premises and Equipment

6 Months Ended

Jun. 30, 2019

Property Plant And Equipment [Abstract]

Premises and Equipment

NOTE 4 – PREMISES AND EQUIPMENT

The Company leases certain premises and equipment under operating leases. At June 30, 2019, the Company had lease liabilities totaling $12.9 million and right-of-use assets totaling $12.2 million related to these leases. Lease liabilities and right-of-use assets are reflected in other liabilities and other assets, respectively. At June 30, 2019, the weighted average remaining lease term for operating leases was 11.1 years and the weighted average discount rate used in the measurement of operating lease liabilities was 3.53%.

Lease costs were as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
Operating lease cost	$	455	$	937
Short-term lease cost		—		—
Variable least cost		—		—
Total lease cost	$	455	$	937

Rent expense for the three and six months ended June 30, 2018, prior to the adoption of ASU 2016-02 was $415,000 and $809,000, respectively.

There were no sale and leaseback transactions, leveraged leases, or lease transactions with related parties during the three or six months ended June 30, 2019 or 2018.

A maturity analysis of operating lease liabilities and reconciliation of the undiscounted cash flows to the total operating lease liability is as follows (in thousands):

	June 30, 2019
Lease payments due:
Within one year	$	1,536
After one but within two years		1,553
After two but within three years		1,517
After three but within four years		1,457
After four but within five years		1,221
After five years		8,267
Total undiscounted cash flows		15,551
Discount on cash flows		(2,662	)
Total lease liability	$	12,889

Federal Home Loan Bank Advances

6 Months Ended

Jun. 30, 2019

Federal Home Loan Banks [Abstract]

Federal Home Loan Bank Advances

NOTE 5 – FEDERAL HOME LOAN BANK ADVANCES

The Company had outstanding borrowings totaling of $10.0 million and $125.0 million at June 30, 2019 and December 31, 2018, respectively, via various advances. These advances are non-callable; interest payments are due monthly, with principal due at maturity.

The following is a summary of the contractual maturities and average effective rates of outstanding advances (dollars in thousands):

	June 30, 2019					December 31, 2018
Year	Amount		Interest Rates			Amount		Interest Rates
2019	$	—		—		$	125,000		2.48	%
2020		10,000		2.42	%		—		—
2021		—		—			—		—
2022		—		—			—		—
2023		—		—			—		—
Thereafter		—		—			—		—
Total	$	10,000		2.42	%	$	125,000		2.48	%

Advances from the FHLB are collateralized by investment securities with a market value of $4.1 million, FHLB stock and certain commercial and residential real estate mortgage loans totaling $728.5 million under a blanket mortgage collateral agreement. At June 30, 2019, the amount of available credit from the FHLB totaled $150.7 million.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2019

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

NOTE 6 – ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following were changes in accumulated other comprehensive income (loss) by component, net of tax, for the six months ended June 30, 2019 and 2018 (dollars in thousands):

				Unrealized Gains			Unrealized
	Gains and			and Losses			Losses on
	Losses on			on Available			Securities
	Cash Flow			for Sale			Transferred to
	Hedges			Securities			Held to Maturity			Total
Six Months Ended June 30, 2019
Beginning Balance	$	(2,636	)	$	(680	)	$	—		$	(3,316	)
Other comprehensive income (loss) before reclassification, net of tax		(205	)		4,140			—			3,935
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(353	)		(80	)		—			(433	)
Net current period other comprehensive income (loss)		(558	)		4,060			—			3,502
Ending Balance	$	(3,194	)	$	3,380		$	—		$	186

Six Months Ended June 30, 2018
Beginning Balance	$	(3,679	)	$	1,162		$	(10	)	$	(2,527	)
Other comprehensive income (loss) before reclassification, net of tax		1,288			(3,643	)		20			(2,335	)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(435	)		2			(10	)		(443	)
Net current period other comprehensive income (loss)		853			(3,641	)		10			(2,778	)
Ending Balance	$	(2,826	)	$	(2,479	)	$	—		$	(5,305	)

The following were significant amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2019 and 2018 (dollars in thousands):

													Affected Line Item
Details about Accumulated Other	Three Months Ended June 30,						Six Months Ended June 30,						in the Statement Where
Comprehensive Income (Loss) Components	2019			2018			2019			2018			Net Income is Presented
Unrealized losses on cash flow hedges	$	(114	)	$	(111	)	$	(224	)	$	(218	)	Interest expense - money market
		(51	)		(113	)		(138	)		(257	)	Interest expense - Federal Home Loan Bank advances
		—			16			9			40		Income tax benefit
	$	(165	)	$	(208	)	$	(353	)	$	(435	)	Net of tax
Unrealized gains (losses) on available- for-sale securities	$	(121	)	$	3		$	(108	)	$	3		Net gain (loss) on sale of securities
		32			(1	)		28			(1	)	Income tax benefit (expense)
	$	(89	)	$	2		$	(80	)	$	2		Net of tax
Unrealized losses on securities transferred to held-to-maturity	$	—		$	—		$	—		$	(14	)	Interest income - securities
		—			—			—			4		Income tax benefit
	$	—		$	—		$	—		$	(10	)	Net of tax

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 8 – COMMITMENTS AND CONTINGENCIES

In the normal course of business, the Company has outstanding commitments and contingent liabilities, such as commitments to extend credit and standby letters of credit, which are not included in the accompanying financial statements. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instruments for commitments to extend credit and standby letters of credit is represented by the contractual or notional amount of those instruments. The Company uses the same credit policies in making such commitments as it does for instruments that are included in the balance sheet.

The following table sets forth outstanding financial instruments whose contract amounts represent credit risk as of June 30, 2019 and December 31, 2018 (dollars in thousands):

	Contract or notional amount
	June 30, 2019		December 31, 2018
Financial instruments whose contract amounts represent credit risk:
Unused commitments to extend credit	$	702,007	$	707,675
Standby letters of credit		11,124		12,273
Total	$	713,131	$	719,948

The Company is party to litigation and claims arising in the normal course of business. Management believes that the liabilities, if any, arising from such litigation and claims as of June 30, 2019, will not have a material impact on the financial statements of the Company.

Derivatives

6 Months Ended

Jun. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivatives

NOTE 9 – DERIVATIVES

The Company utilizes derivative financial instruments, interest rate swaps and mortgage banking related derivatives, as part of its ongoing efforts to manage its interest rate risk exposure as well as the exposure for its customers. The notional amount of the interest rate swaps does not represent amounts exchanged by the parties. The amount exchanged is determined by reference to the notional amount and the other terms of the individual interest rate swap agreements.

Interest Rate Swaps Designated as Cash Flow Hedges

There were no interest rate swaps designated as cash flow hedges as of June 30, 2019. Forward starting interest rate swaps with notional amounts totaling $20 million as of December 31, 2018 were designated as cash flow hedges of certain liabilities and were determined to be fully effective during all periods presented. As such, no amount of ineffectiveness was included in net income. Therefore, the aggregate fair value of the swaps is recorded in other liabilities with changes in fair value recorded in other comprehensive income. The Company terminated an interest rate swap during the second quarter of 2019 with a notional amount of $20 million, which resulted in a termination fee of $1.5 million. Cash flow swaps that have been terminated resulting in cash settlement equal to previously unrealized gains or losses are included in accumulated other comprehensive income and are being amortized to net income over the remaining contractual terms of the swaps.

Summary information about the interest-rate swaps designated as cash flow hedges was as follows (dollars in thousands):

	June 30, 2019		December 31, 2018
Notional amounts	$	—	$	20,000
Weighted average pay rates		—		3.54	%
Weighted average receive rates		—	3 month LIBOR
Weighted average maturity		—	4.5 years
Fair value	$	—	$	(836	)
Amount of unrealized loss recognized in accumulated other comprehensive income, net of tax	$	—	$	(617	)

Pursuant to its interest rate swap agreements, the Company pledged collateral to the counterparties in the form of investment securities with a market value of $1.9 million at June 30, 2019. There was no collateral posted from the counterparties to the Company as of June 30, 2019.

Other Interest Rate Swaps

The Company also enters into swaps to facilitate customer transactions and meet their financing needs. Upon entering into these transactions the Company enters into offsetting positions with large U.S. financial institutions in order to minimize risk to the Company. A summary of the Company’s customer related interest rate swaps was as follows (dollars in thousands):

	June 30, 2019					December 31, 2018
	Notional		Estimated			Notional		Estimated
	amount		fair value			amount		fair value
Interest rate swap agreements:
Pay fixed/receive variable swaps	$	27,940	$	(741	)	$	29,126	$	24
Pay variable/receive fixed swaps		27,940		741			29,126		(24	)
Total	$	55,880	$	—		$	58,252	$	—

Mortgage Banking Derivatives

The Company enters into various derivative agreements with customers in the form of interest-rate lock commitments which are commitments to originate mortgage loans whereby the interest rate on the loan is determined prior to funding and the customers have locked into that interest rate. The derivatives are valued using a model that utilizes market interest rates and other unobservable inputs. Changes in the fair value of these commitments due to fluctuations in interest rates that are to be originated to our loans held for sale portfolio are economically hedged through the use of forward sale commitments of mortgage-backed securities. The gains and losses arising from this derivative activity are reflected in current period earnings under mortgage banking income. Interest rate lock commitments are valued using a model with significant unobservable market parameters. Forward sale commitments are valued based on quoted prices for similar assets in an active market with inputs that are observable.

The net gains (losses) relating to mortgage banking derivative instruments included in mortgage banking income were as follows (dollars in thousands):

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Mortgage loan interest rate lock commitments	$	592		$	592
Mortgage-backed securities forward sales commitments		(353	)		(353	)
Total	$	239		$	239

There were no gains (losses) relating to mortgage banking derivative instruments for the three or six months ended June 30, 2018.

The amount and fair value of mortgage banking derivatives included in the consolidated balance sheets was as follows (dollars in thousands):

	June 30, 2019					December 31, 2018
	Notional		Estimated			Notional		Estimated
	amount		fair value			amount		fair value
Included in other assets:
Mortgage loan interest rate lock commitments	$	52,100	$	592		$	—	$	—
Included in other liabilities:
Mortgage-backed securities forward sales commitments	$	49,750	$	(278	)	$	—	$	—

Stock Options and Restricted Shares

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Options and Restricted Shares

NOTE 10 - STOCK OPTIONS AND RESTRICTED SHARES

During 2008, the board of directors of the Bank approved the CapStar Bank 2008 Stock Incentive Plan. Following the formation of CapStar Financial Holdings, Inc. in 2016, and in connection with the Share Exchange, the outstanding awards of restricted stock and stock options under the CapStar Bank 2008 Stock Incentive Plan were exchanged for similar awards of restricted stock and stock options issued by CapStar Financial Holdings, Inc. under the CapStar Financial Holdings, Inc. Stock Incentive Plan (the “Plan”), which the board of directors adopted in 2016. The Stock Incentive Plan provides for the grant of stock-based incentives, including stock options, restricted stock units, performance awards and restricted stock, to employees, directors and service providers that are subject to forfeiture until vesting conditions have been satisfied by the award recipient under the terms of the award. The Plan is intended to help align the interests of employees and our shareholders and reward our employees for improved Company performance. The Plan reserved 1,569,475 shares of stock for issuance of stock incentives. In April 2018 the board of directors reserved an additional 400,000 shares of stock for issuance of stock incentives. Stock incentives include both restricted share and stock option grants. Total shares issuable under the plan were 354,518 at June 30, 2019.

The Company has recognized stock-based compensation expense, within salaries and employee benefits for employees, and within other non-interest expense for directors, in the consolidated statements of income as follows (dollars in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
Stock-based compensation expense before income taxes	$	340		$	325		$	684		$	630
Less: deferred tax benefit		(89	)		(85	)		(179	)		(165	)
Reduction of net income	$	251		$	240		$	505		$	465

Restricted Shares

Compensation expense is recognized over the vesting period of the awards based on the fair value of the stock at the issue date. The fair value of each restricted stock grant is based on valuations performed by independent consultants. The recipients have the right to vote and receive dividends but cannot sell, transfer, assign, pledge, hypothecate, or otherwise encumber the restricted stock until the shares have vested. Restricted shares fully vest on the third anniversary of the grant date. A summary of the changes in the Company’s nonvested restricted shares for the six months ended June 30, 2019 follows:

				Weighted
				Average
	Restricted			Grant Date
Nonvested Shares	Shares			Fair Value
Nonvested at beginning of period		157,616		$	17.00
Granted		30,183			15.91
Vested		(55,650	)		15.13
Forfeited		(11,801	)		17.73
Nonvested at end of period		120,348		$	17.52

As of June 30, 2019, there was $2.6 million of unrecognized compensation cost related to nonvested shares granted under the Plan. The cost is expected to be recognized over a weighted-average period of 1.9 years. The total fair value of shares vested during the six months ended June 30, 2019 and 2018 was $0.9 million and $1.6 million.

Stock Options

Option awards are generally granted with an exercise price equal to the fair value of the Company’s common stock at the date of grant. Option awards generally have a four year vesting period and a ten year contractual term.

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model that uses the assumptions noted in the table below. Expected volatility is based on historical volatilities of the Company’s common stock. The expected term of options granted was calculated using the “simplified” method for plain vanilla options. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. There were no options granted in 2018. The Company granted 50,000 options during 2019.

The fair value of options granted during 2019 was determined using the following weighted average assumptions as of the grant date.

	2019
Dividend yield		1.35	%
Expected term (in years)		6.50
Expected stock price volatility		29.55	%
Risk-free interest rate		2.25	%

A summary of the activity in stock options for the six months ended June 30, 2019 follows:

						Weighted
				Weighted		Average
				Average		Remaining
				Exercise		Contractual
	Shares			Price		Term (years)
Outstanding at beginning of period		507,903		$	8.66
Granted		50,000			14.84
Exercised		(218,954	)		6.68
Forfeited or expired		—			—
Outstanding at end of period		338,949		$	10.86		4.8
Fully vested and expected to vest		338,508		$	10.85		4.8
Exercisable at end of period		282,699		$	10.10		3.8

Information related to stock options during each year follows:

	2019		2018
Intrinsic value of options exercised	$	2,007,300	$	2,081,344
Cash received from option exercises		1,253,233		2,186,420
Tax benefit realized from option exercises		14,979		544,063
Weighted average fair value of options granted		5.35		—

As of June 30, 2019, there was $0.3 million of unrecognized compensation cost related to nonvested stock options granted under the Plan. The cost is expected to be recognized over a weighted-average period of 2.8 years.

Regulatory Capital Requirements

6 Months Ended

Jun. 30, 2019

Banking And Thrift [Abstract]

Regulatory Capital Requirements

NOTE 11 – REGULATORY CAPITAL REQUIREMENTS

The Company and the Bank are subject to regulatory capital requirements administered by the Federal Reserve and the Bank is also subject to the regulatory capital requirements of the Tennessee Department of Financial Institutions. Failure to meet capital requirements can initiate certain mandatory – and possibly additional discretionary – actions by regulators that could, in that event, have a material adverse effect on the institutions’ financial statements. The relevant regulations require the Company and the Bank to meet specific capital adequacy guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting principles. The capital classifications of the Company and the Bank are also subject to qualitative judgments by their regulators about components, risk weightings, and other factors. Those qualitative judgments could also affect the capital status of the Company and the Bank and the amount of dividends the Company and the Bank may distribute. The final rules implementing the Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) became effective for the Bank on January 1, 2015 with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. The net unrealized gain or loss on available for sale securities is not included in computing regulatory capital. Management believes as of June 30, 2019, the Company and the Bank met all regulatory capital adequacy requirements to which they are subject.

The Company’s and the Bank’s capital amounts and ratios as of June 30, 2019 and December 31, 2018 are presented in the following table (dollars in thousands).

	Actual					Minimum capital requirement (1)					Minimum to be well-capitalized (2)
	Amount		Ratio			Amount		Ratio			Amount		Ratio
At June 30, 2019:
Total capital to risk-weighted assets:
CapStar Financial Holdings, Inc.	$	228,302		13.29	%	$	137,394		8.00	%	N/A		N/A
CapStar Bank		213,170		12.41			137,368		8.00		$	171,710		10.00
Tier I capital to risk-weighted assets:
CapStar Financial Holdings, Inc.		215,220		12.53			103,046		6.00		N/A		N/A
CapStar Bank		200,088		11.65			103,026		6.00			137,368		8.00
Common equity Tier 1 capital to risk weighted assets:
CapStar Financial Holdings, Inc.		206,220		12.01			77,284		4.50		N/A		N/A
CapStar Bank		183,588		10.69			77,270		4.50			111,612		6.50
Tier I capital to average assets:
CapStar Financial Holdings, Inc.		215,220		11.01			78,224		4.00		N/A		N/A
CapStar Bank		200,088		10.24			78,186		4.00			97,733		5.00

At December 31, 2018:
Total capital to risk-weighted assets:
CapStar Financial Holdings, Inc.	$	222,030		12.84	%	$	138,336		8.00	%	N/A		N/A
CapStar Bank		201,972		11.68			138,294		8.00		$	172,868		10.00
Tier I capital to risk-weighted assets:
CapStar Financial Holdings, Inc.		209,738		12.13			103,752		6.00		N/A		N/A
CapStar Bank		189,680		10.97			103,721		6.00			138,294		8.00
Common equity Tier 1 capital to risk weighted assets:
CapStar Financial Holdings, Inc.		200,738		11.61			77,814		4.50		N/A		N/A
CapStar Bank		173,180		10.02			77,791		4.50			112,364		6.50
Tier I capital to average assets:
CapStar Financial Holdings, Inc.		209,738		11.06			75,867		4.00		N/A		N/A
CapStar Bank		189,680		10.01			75,828		4.00			94,785		5.00

(1)

For the calendar year 2019, the Company must maintain a capital conservation buffer of Tier 1 common equity capital in excess of minimum risk-based capital ratios by at least 2.5% to avoid limits on capital distributions and certain discretionary bonus payments to executive officers and similar employees.

(2)

For the Company to be well-capitalized, the Bank must be well-capitalized and the Company must not be subject to any written agreement, order, capital directive, or prompt corrective action directive issued by the Federal Reserve to meet and maintain a specific capital level for any capital measure.

- Definition

The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time.

+ References

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+ Details

Earnings Per Share

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 12 – EARNINGS PER SHARE

The following is a summary of the basic and diluted earnings per share calculation for the three and six months ended June 30, 2019 and 2018 (dollars in thousands, except share data):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Basic net income per share calculation:
Numerator – Net income	$	5,756	$	3,513	$	10,535	$	6,707
Denominator – Average common shares outstanding		17,663,992		11,845,822		17,723,286		11,755,535
Basic net income per share	$	0.33	$	0.30	$	0.59	$	0.57
Diluted net income per share calculation:
Numerator – Net income	$	5,756	$	3,513	$	10,535	$	6,707
Denominator – Average common shares outstanding		17,663,992		11,845,822		17,723,286		11,755,535
Dilutive shares contingently issuable		986,714		1,221,401		1,017,036		1,266,209
Average diluted common shares outstanding		18,650,706		13,067,223		18,740,322		13,021,744
Diluted net income per share	$	0.31	$	0.27	$	0.56	$	0.52

Fair Value

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value

NOTE 13 – FAIR VALUE

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values:

Level 1:

Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2:

Significant observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

Level 3:

Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

The Bank used the following methods and significant assumptions to estimate fair value:

Investment Securities: The fair values for investment securities are determined by quoted market prices, if available (Level 1). For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2), using matrix pricing. Matrix pricing is a mathematical technique commonly used to price debt securities that are not actively traded and, values debt securities by relying on quoted prices for the specific securities and the securities’ relationship to other benchmark quoted securities (Level 2 inputs). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows or other market indicators (Level 3). See below for additional discussion of Level 3 valuation methodologies and significant inputs. The fair values of all securities are determined from third party pricing services without adjustment.

Other Real Estate Owned: Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals which are updated no less frequently than annually. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach with data from comparable properties. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Appraisals may be adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and/or management’s expertise and knowledge of the collateral. Such adjustments result in a Level 3 classification of the inputs for determining fair value. Real estate owned properties are evaluated on a quarterly basis for additional impairment and adjusted accordingly. The Company had no other real estate owned carried at fair value as of June 30, 2019 or December 31, 2018.

Loans Held For Sale: Loans held for sale are carried at either fair value, if elected, or the lower of cost or fair value on a pool-level basis. Origination fees and costs for loans held for sale recorded at lower of cost or market are capitalized in the basis of the loan and are included in the calculation of realized gains and losses upon sale. Origination fees and costs are recognized in earnings at the time of origination for loans held for sale that are recorded at fair value. Fair value is determined using quoted prices for similar assets, adjusted for specific attributes of that loan or other observable market data, such as outstanding commitments from third party investors (Level 2). There were no loans held for sale carried at fair value at December 31, 2018.

Impaired Loans: The fair value of impaired loans with specific allocations of the allowance for loan losses is generally based on recent appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and collateral underlying such loans. Such adjustments result in a Level 3 classification of the inputs for determining fair value. Collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on at least a quarterly basis for additional impairment and adjusted in accordance with the loan policy.

Derivatives-Interest Rate Swaps: The fair values of derivatives are based on valuation models using observable market data as of the measurement date (Level 2). The Bank’s derivatives are traded in an over-the-counter market where quoted market prices are not always available. Therefore, the fair values of derivatives are determined using quantitative models that utilize multiple market inputs. The inputs will vary based on the type of derivative, but could include interest rates, prices and indices to generate continuous yield or pricing curves, prepayment rates, and volatility factors to value the position. The majority of market inputs are actively quoted and can be validated through external sources, including brokers, market transactions and third-party pricing services. The fair values of all interest rate swaps are determined from third party pricing services without adjustment.

Derivatives-Mortgage Loan Interest Rate Lock Commitments: Interest rate lock commitments that relate to the origination of mortgage loans that will be held for sale are recorded at fair value, determined as the amount that would be required to settle each derivative instrument at the balance sheet date. The fair value of the interest rate lock commitment is derived from the fair value of related mortgage loans, which is based on observable market data and includes the expected net future cash flows related to servicing of the loans. In estimating the fair value of an interest rate lock commitment, the Company assigns a probability to the interest rate lock commitment based on an expectation that it will be exercised and the loan will be funded (a “pull through” rate). The expected pull through rates are applied to the fair value of the unclosed mortgage pipeline, resulting in a Level 3 fair value classification. The pull through rate is a statistical analysis of our actual rate lock fallout history to determine the sensitivity of the residential mortgage loan pipeline compared to interest rate changes and other deterministic values. New market prices are applied based on updated loan characteristics and new fallout ratios (i.e., the inverse of the pull through rate) are applied accordingly. Significant increases (decreases) in the pull through rate in isolation result in a significantly higher (lower) fair value measurement. Changes to the fair value of interest rate lock commitments are recognized based on interest rate changes, changes in the probability that the commitment will be exercised, and the passage of time.

Derivatives-Mortgage-Backed Securities Forward Sales Commitments: The Company utilizes mortgage-backed securities forward sales commitments to hedge mortgage loan interest rate lock commitments. Mortgage-backed securities forward sales commitments are recorded at fair value based on quoted prices for similar assets in an active market with inputs that are observable, resulting in a Level 2 fair value classification.

Assets and liabilities measured at fair value on a recurring basis are summarized below (dollars in thousands):

	Fair value measurements at June 30, 2019
				Quoted prices
				in active		Significant
				markets for		other			Significant
				identical		observable			unobservable
	Carrying			assets		inputs			inputs
	Value			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities available-for-sale:
U.S. government-sponsored agencies	$	6,477		$	—	$	6,477		$	—
Obligations of states and political subdivisions		51,499			—		51,499			—
Mortgage-backed securities-residential		124,840			—		124,840			—
Asset-backed securities		3,299			—		3,299			—
Other debt securities		8,842			—		8,842			—
Loans held for sale		37,604			—		37,604			—
Derivative assets:
Non-hedging derivatives:
Interest rate swaps - customer related		752			—		752			—
Mortgage loan interest rate lock commitments		592			—		—			592
Liabilities:
Derivative liabilities:
Non-hedging derivatives:
Interest rate swaps - customer related		(752	)		—		(752	)		—
Mortgage-backed securities forward sales commitments		(278	)		—		(278	)		—

	Fair value measurements at December 31, 2018
				Quoted prices
				in active		Significant
				markets for		other			Significant
				identical		observable			unobservable
	Carrying			assets		inputs			inputs
	Value			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities available-for-sale:
U.S. government-sponsored agencies	$	10,706		$	—	$	10,706		$	—
Obligations of states and political subdivisions		61,926			—		61,926			—
Mortgage-backed securities-residential		144,158			—		144,158			—
Asset-backed securities		15,284			—		15,284			—
Other debt securities		11,734			—		11,734			—
Derivative assets:
Non-hedging derivatives:
Interest rate swaps - customer related		494			—		494			—
Liabilities:
Derivative liabilities:
Cash flow hedges:
Interest rate swaps - cash flow hedges		(836	)		—		(836	)		—
Non-hedging derivatives:
Interest rate swaps - customer related		(494	)		—		(494	)		—

The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the six months ended June 30, 2019 and 2018 (dollars in thousands):

	Mortgage Loan Interest Rate
	Lock Commitments
	2019		2018

Balance of recurring Level 3 assets at January 1st	$	—	$	—
Total gains or losses for the period:
Include in mortgage banking income		592		—
Balance of recurring Level 3 assets at June 30th	$	592	$	—

The following table presents quantitative information about recurring Level 3 fair value measurements at June 30, 2019 (dollars in thousands). There were no Level 3 fair value measurements at December 31, 2018.

					Range
	Fair		Valuation		(Weighted-
June 30, 2019	Value		Technique(s)	Unobservable Input(s)	Average)
Assets:
Non-hedging derivatives:
Mortgage loan interest rate lock commitments	$	592	Consensus pricing	Origination pull-through rate	68% - 96% (80%)

Assets measured at fair value on a nonrecurring basis are summarized below (dollars in thousands): There were no assets measured at fair value on a nonrecurring basis at December 31, 2018.

Fair value measurements at June 30, 2019

Quoted prices

in active

Significant

markets for

other

Significant

identical

observable

unobservable

Carrying

assets

inputs

Value

(level 1)

(level 2)

(level 3)

Assets:

Impaired loans:

Commercial and industrial

444

—

444

The following table presents quantitative information about Level 3 fair value measurements for assets measured at fair value on a non-recurring basis at June 30, 2019 (dollars in thousands):

Range

Fair

Valuation

(Weighted-

June 30, 2019

Value

Technique(s)

Unobservable Input(s)

Average)

Impaired loans:

Commercial and industrial

444

Sales Comparison approach

Appraisal discounts

25%

Fair Value of Financial Instruments

The carrying value and estimated fair values of the Bank’s financial instruments at June 30, 2019 and December 31, 2018 were as follows (dollars in thousands):

	June 30, 2019				December 31, 2018
	Carrying				Carrying				Fair value
	amount		Fair value		amount		Fair value		level of input
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	$	156,085	$	156,085	$	94,681	$	94,681	Level 1
Federal funds sold		—		—		10,762		10,762	Level 1
Securities available-for-sale		194,957		194,957		243,808		243,808	Level 2
Securities held-to-maturity		3,721		3,820		3,734		3,785	Level 2
Loans held for sale		89,629		90,800		57,618		58,596	Level 2
Restricted equity securities		14,150	N/A			12,038	N/A		N/A
Loans		1,440,617		1,435,130		1,429,794		1,442,082	Level 3
Accrued interest receivable		6,045		6,045		5,964		5,964	Level 2
Other assets		35,157		35,157		34,489		34,489	Level 2 / Level 3
Financial liabilities:
Deposits		1,722,770		1,723,123		1,570,008		1,572,880	Level 3
Federal Home Loan Bank advances		10,000		10,000		125,000		126,548	Level 2
Other liabilities		1,606		1,606		2,753		2,753	Level 3

The methods and assumptions, not previously presented, used to estimate fair values are described as follows:

(a)	Cash and Due from Banks, Interest-Bearing Deposits in Financial Institutions

For these short‑term instruments, the carrying amount is a reasonable estimate of fair value.

(b)	Federal Funds Sold

Federal funds sold clear on a daily basis. For this reason, the carrying amount is a reasonable estimate of fair value.

(c)	Restricted Equity Securities

It is not practical to determine the fair value of restricted securities due to restrictions placed on their transferability.

(d)

Loans

In accordance with the prospective adoption of ASU 2016-01, the fair value of loans was measured using an exit price notion. Fair values for impaired loans are estimated using discounted cash flow models or based on the fair value of the underlying collateral.

(e)	Accrued Interest Receivable

The carrying amounts of accrued interest approximate fair value.

(f)	Other Assets

Included in other assets are bank owned life insurance and certain interest rate swap agreements. The fair values of interest rate swap agreements are based on independent pricing services that utilize pricing models with observable market inputs. For bank owned life insurance, the carrying amount is based on the cash surrender value and is a reasonable estimate of fair value.

(g)

Deposits

The fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date. The fair value of certificates of deposit is estimated by discounted cash flow models, using current market interest rates offered on certificates with similar remaining maturities.

(h)	Federal Home Loan Bank Advances

The fair value of fixed rate Federal Home Loan Bank Advances is estimated using discounted cash flow models, using current market interest rates offered on certificates, advances and other borrowings with similar remaining maturities.

(i)	Other Liabilities

Included in other liabilities are accrued interest payable and certain interest rate swap agreements. The fair values of interest rate swap agreements are based on independent pricing services that utilize pricing models with observable market inputs. The carrying amounts of accrued interest approximate fair value.

(j)	Off-Balance Sheet Instruments

Fair values for off-balance sheet, credit-related financial instruments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The fair value of commitments is not material.

(k)	Limitations

Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instruments. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Bank’s entire holdings of a particular instrument. Because no market exists for a significant portion of the Bank’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates are based on estimating on and off‑balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, fixed assets are not considered financial instruments and their value has not been incorporated into the fair value estimates. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

Use of Estimates

Loans Held For Sale and Fair Value Option

	Fair Value		Aggregate Unpaid Principal Balance		Difference
June 30, 2019
Residential mortgage loans held for sale	$	37,604	$	36,692	$	912

No residential mortgage loans held for sale were greater than 89 days past due or on nonaccrual status as of June 30, 2019 or December 31, 2018.

Subsequent Events

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Difference Between the Fair Value and Aggregate Unpaid Principal Balance

The following table summarizes the difference between the fair value and the aggregate unpaid principal balance for residential real estate loans held for sale as of June 30, 2019 (dollars in thousands):

	Fair Value		Aggregate Unpaid Principal Balance		Difference
June 30, 2019
Residential mortgage loans held for sale	$	37,604	$	36,692	$	912

Securities (Tables)

6 Months Ended

Jun. 30, 2019

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities

The amortized cost and fair value of securities available-for-sale and held-to-maturity at June 30, 2019 and December 31, 2018 are summarized as follows (dollars in thousands):

	June 30, 2019									December 31, 2018
	Amortized Cost		Gross unrealized gains		Gross unrealized (losses)			Estimated fair value		Amortized Cost		Gross unrealized gains		Gross unrealized (losses)			Estimated fair value
Securities available-for-sale:
U. S. government agency securities	$	6,491	$	41	$	(55	)	$	6,477	$	11,053	$	—	$	(347	)	$	10,706
State and municipal securities		49,911		1,665		(77	)		51,499		62,142		765		(981	)		61,926
Mortgage-backed securities		124,073		1,552		(785	)		124,840		146,547		776		(3,165	)		144,158
Asset-backed securities		3,402		—		(103	)		3,299		15,437		4		(157	)		15,284
Other debt securities		8,816		68		(42	)		8,842		11,863		71		(200	)		11,734
Total	$	192,693	$	3,326	$	(1,062	)	$	194,957	$	247,042	$	1,616	$	(4,850	)	$	243,808
Securities held-to-maturity:
State and municipal securities	$	3,721	$	99	$	—		$	3,820	$	3,734	$	54	$	(3	)	$	3,785
Total	$	3,721	$	99	$	—		$	3,820	$	3,734	$	54	$	(3	)	$	3,785

Summary of Securities with Unrealized Losses and Length of Time Continuous Loss Positions

	Less than 12 months					12 months or more					Total
June 30, 2019	Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses
U. S. government agency securities	$	—	$	—		$	3,715	$	(55	)	$	3,715	$	(55	)
State and municipal securities		—		—			6,340		(77	)		6,340		(77	)
Mortgage-backed securities		3,002		(7	)		61,711		(778	)		64,713		(785	)
Asset-backed securities		3,299		(103	)		—		—			3,299		(103	)
Other debt securities		985		(15	)		2,489		(27	)		3,474		(42	)
Total temporarily impaired securities	$	7,286	$	(125	)	$	74,255	$	(937	)	$	81,541	$	(1,062	)

December 31, 2018
U. S. government agency securities	$	—	$	—		$	10,706	$	(347	)	$	10,706	$	(347	)
State and municipal securities		13,455		(212	)		17,376		(772	)		30,831		(984	)
Mortgage-backed securities		7,075		(17	)		87,232		(3,148	)		94,307		(3,165	)
Asset-backed securities		8,262		(145	)		2,439		(12	)		10,701		(157	)
Other debt securities		5,362		(200	)		—		—			5,362		(200	)
Total temporarily impaired securities	$	34,154	$	(574	)	$	117,753	$	(4,279	)	$	151,907	$	(4,853	)

Summary of Sale of Debt and Equity Securities

Results from sales of debt and equity securities were as follows (dollars in thousands):

	Six Months Ended			Six Months Ended
	June 30, 2019			June 30, 2018
Proceeds	$	54,133		$	5,778
Gross gains		370			107
Gross losses		(478	)		(104	)

Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

	Available-for-sale				Held-to-maturity
	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Due in less than one year	$	6,794	$	6,870	$	998	$	999
Due one to five years		24,757		25,289		2,723		2,821
Due five to ten years		30,966		32,009		—		—
Due beyond ten years		2,701		2,650		—		—
Mortgage-backed securities		124,073		124,840		—		—
Asset-backed securities		3,402		3,299		—		—
Total	$	192,693	$	194,957	$	3,721	$	3,820

Loans and Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

Summary of Loan Portfolio

A summary of the loan portfolio as of June 30, 2019 and December 31, 2018 follows (dollars in thousands):

	June 30, 2019			December 31, 2018
Commercial real estate	$	594,812		$	550,446
Consumer real estate		255,043			253,562
Construction and land development		123,901			174,670
Commercial and industrial		404,745			404,600
Consumer		26,704			25,615
Other		35,412			20,901
Total		1,440,617			1,429,794
Allowance for loan losses		(12,903	)		(12,113	)
Total loans, net	$	1,427,714		$	1,417,681

Summary of Loan Balance by Category as well as Risk Rating

The following tables present the loan balances by category as well as risk rating (dollars in thousands):

	Non-impaired Loans
June 30, 2019	Pass/Watch		Special Mention		Substandard		Total Non-impaired		Total Impaired Loans		Total
Commercial real estate	$	592,071	$	164	$	1,228	$	593,463	$	1,349	$	594,812
Consumer real estate		250,647		1,677		1,820		254,144		899		255,043
Construction and land development		123,710		50		17		123,777		124		123,901
Commercial and industrial		383,040		10,856		9,531		403,427		1,318		404,745
Consumer		26,661		—		4		26,665		39		26,704
Other		35,412		—		—		35,412		—		35,412
Total	$	1,411,541	$	12,747	$	12,600	$	1,436,888	$	3,729	$	1,440,617

December 31, 2018
Commercial real estate	$	547,616	$	177	$	1,262	$	549,055	$	1,391	$	550,446
Consumer real estate		249,273		1,676		1,691		252,640		922		253,562
Construction and land development		174,591		52		19		174,662		8		174,670
Commercial and industrial		388,719		7,790		6,545		403,054		1,546		404,600
Consumer		25,556		1		27		25,584		31		25,615
Other		20,901		—		—		20,901		—		20,901
Total	$	1,406,656	$	9,696	$	9,544	$	1,425,896	$	3,898	$	1,429,794

Summary of Changes and Breakdown of Allowance for Loan Losses and Loan Portfolio by Loan Category

The following tables detail the changes in the ALL for the three and six months ended June 30, 2019 and 2018 (dollars in thousands):

	Commercial real estate		Consumer real estate		Construction and land development			Commercial and industrial			Consumer			Other			Total
Three Months Ended June 30, 2019
Balance, beginning of period	$	3,514	$	1,017	$	2,366		$	5,524		$	139		$	399		$	12,959
Charged-off loans		—		—		—			(26	)		(41	)		(51	)		(118	)
Recoveries		6		13		—			14			22			7			62
Provision for loan losses		402		112		(633	)		6			46			67			—
Balance, end of period	$	3,922	$	1,142	$	1,733		$	5,518		$	166		$	422		$	12,903

Three Months Ended June 30, 2018
Balance, beginning of period	$	3,512	$	1,036	$	1,742		$	7,798		$	122		$	353		$	14,563
Charged-off loans				—		—			(79	)		(12	)		—			(91	)
Recoveries		6		1		—			53			4			—			64
Provision for loan losses		33		20		22			7			6			81			169
Balance, end of period	$	3,551	$	1,057	$	1,764		$	7,779		$	120		$	434		$	14,705

	Commercial real estate		Consumer real estate			Construction and land development			Commercial and industrial			Consumer			Other			Total
Six Months Ended June 30, 2019
Balance, beginning of period	$	3,309	$	1,005		$	2,431		$	5,036		$	105		$	227		$	12,113
Charged-off loans		—		—			—			(26	)		(78	)		(96	)		(200	)
Recoveries		12		16						16			41			19			104
Provision for loan losses		601		121			(698	)		492			98			272			886
Balance, end of period	$	3,922	$	1,142		$	1,733		$	5,518		$	166		$	422		$	12,903

Six Months Ended June 30, 2018
Balance, beginning of period	$	3,324	$	1,063		$	1,628		$	7,209		$	91		$	406		$	13,721
Charged-off loans		—		—			—			(226	)		(25	)		—			(251	)
Recoveries		10		2			—			326			51			—			389
Provision for loan losses		217		(8	)		136			470			3			28			846
Balance, end of period	$	3,551	$	1,057		$	1,764		$	7,779		$	120		$	434		$	14,705

A breakdown of the ALL and the loan portfolio by loan category at June 30, 2019 and December 31, 2018 follows (dollars in thousands):

	Commercial real estate		Consumer real estate		Construction and land development		Commercial and industrial		Consumer		Other		Total
June 30, 2019
Allowance for Loan Losses:
Collectively evaluated for impairment	$	3,922	$	1,142	$	1,733	$	5,348	$	166	$	422	$	12,733
Individually evaluated for impairment		—		—		—		170		—		—		170
Acquired with deteriorated credit quality		—		—		—		—		—		—		—
Balances, end of period	$	3,922	$	1,142	$	1,733	$	5,518	$	166	$	422	$	12,903
Loans:
Collectively evaluated for impairment	$	593,463	$	254,144	$	123,777	$	403,427	$	26,665	$	35,412	$	1,436,888
Individually evaluated for impairment		1,238		213		117		616		8		—		2,192
Acquired with deteriorated credit quality		111		686		7		702		31		—		1,537
Balances, end of period	$	594,812	$	255,043	$	123,901	$	404,745	$	26,704	$	35,412	$	1,440,617

December 31, 2018
Allowance for Loan Losses:
Collectively evaluated for impairment	$	3,309	$	1,005	$	2,431	$	5,036	$	105	$	227	$	12,113
Individually evaluated for impairment		—		—		—		—		—		—		—
Acquired with deteriorated credit quality		—		—		—		—		—		—		—
Balances, end of period	$	3,309	$	1,005	$	2,431	$	5,036	$	105	$	227	$	12,113
Loans:
Collectively evaluated for impairment	$	549,055	$	252,640	$	174,662	$	403,054	$	25,584	$	20,901	$	1,425,896
Individually evaluated for impairment		1,278		183		—		817		—		—		2,278
Acquired with deteriorated credit quality		113		739		8		729		31		—		1,620
Balances, end of period	$	550,446	$	253,562	$	174,670	$	404,600	$	25,615	$	20,901	$	1,429,794

Allocation of ALL with Corresponding Percentage of ALL in Each Category to Total Loans, Net of Deferred Fee

	June 30, 2019					December 31, 2018
	Amount		Percent of total loans			Amount		Percent of total loans
Commercial real estate	$	3,922		0.27	%	$	3,309		0.23	%
Consumer real estate		1,142		0.08			1,005		0.07
Construction and land development		1,733		0.12			2,431		0.17
Commercial and industrial		5,518		0.39			5,036		0.35
Consumer		166		0.01			105		0.01
Other		422		0.03			227		0.02
Total allowance for loan losses	$	12,903		0.90	%	$	12,113		0.85	%

Summary of Impaired Loans

The following table presents the Company’s impaired loans that were evaluated for specific loss allowance as of June 30, 2019 and December 31, 2018 (dollars in thousands):


	June 30, 2019						December 31, 2018
	Recorded investment		Unpaid principal balance		Related allowance		Recorded investment		Unpaid principal balance		Related allowance
With no related allowance recorded:
Commercial real estate	$	1,349	$	1,416	$	—	$	1,391	$	1,775	$	—
Consumer real estate		899		1,307		—		922		1,204		—
Construction and land development		124		151		—		8		18		—
Commercial and industrial		704		1,478		—		1,546		6,350		—
Consumer		39		68		—		31		56		—
Other		—		—		—		—		—		—
Subtotal		3,115		4,420		—		3,898		9,403		—
With an allowance recorded:
Commercial real estate		—		—		—		—		—		—
Consumer real estate		—		—		—		—		—		—
Construction and land development		—		—		—		—		—		—
Commercial and industrial		614		4,744		170		—		—		—
Consumer		—		—		—		—		—		—
Other		—		—		—		—		—		—
Subtotal		614		4,744		170		—		—		—
Total	$	3,729	$	9,164	$	170	$	3,898	$	9,403	$	—

	Three Months Ended				Three Months Ended				Six Months Ended				Six Months Ended
	June 30, 2019				June 30, 2018				June 30, 2019				June 30, 2018
	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
With no related allowance recorded:
Commercial real estate	$	1,356	$	19	$	1,181	$	15	$	1,365	$	35	$	1,189	$	25
Consumer real estate		916		4		—		—		917		4		—		—
Construction and land development		128		1		—		—		128		1		—		—
Commercial and industrial		709		19		—		—		709		19		—		—
Consumer		44		—		—		—		44		—		—		—
Other		—		—		—		—		—		—		—		—
Subtotal		3,153		43		1,181		15		3,163		59		1,189		25
With an allowance recorded:
Commercial real estate		—		—		—		—		—		—		—		—
Consumer real estate		—		—		—		—		—		—		—		—
Construction and land development		—		—		—		—		—		—		—		—
Commercial and industrial		732		—		5,425		31		760		—		5,345		118
Consumer		—		—		—		—		—		—		—		—
Other		—		—		—		—		—		—		—		—
Subtotal		732		—		5,425		31		760		—		5,345		118
Total	$	3,885	$	43	$	6,606	$	46	$	3,923	$	59	$	6,534	$	143

Schedule of Aging of Recorded Investment in Past-due Loans, by Class of Loans

The following table presents the aging of the recorded investment in past-due loans as of June 30, 2019 and December 31, 2018 by class of loans (dollars in thousands):

	30 - 59		60 - 89		Greater Than
	Days		Days		89 Days		Total		Loans Not
	Past Due		Past Due		Past Due		Past Due		Past Due		Total
June 30, 2019
Commercial real estate	$	—	$	1,307	$	—	$	1,307	$	593,505	$	594,812
Consumer real estate		378		947		733		2,058		252,985		255,043
Construction and land development		—		51		—		51		123,850		123,901
Commercial and industrial		89		271		614		974		403,771		404,745
Consumer		161		29		54		245		26,459		26,704
Other		—		—		—		—		35,412		35,412
Total	$	628	$	2,605	$	1,402	$	4,635	$	1,435,982	$	1,440,617

December 31, 2018
Commercial real estate	$	300	$	227	$	—	$	527	$	549,919	$	550,446
Consumer real estate		69		75		775		919		252,643		253,562
Construction and land development		—		—		—		—		174,670		174,670
Commercial and industrial		54		—		—		54		404,546		404,600
Consumer		52		—		43		95		25,520		25,615
Other		—		—		—		—		20,901		20,901
Total	$	475	$	302	$	818	$	1,595	$	1,428,199	$	1,429,794

Schedule of Recorded In Non Accrual Loans, Past Due Loans over 89 Days Outstanding and Accruing and Troubled Debt Restructurings

	Non-Accrual		Past Due Over 89 Days and Accruing		Troubled Debt Restructurings
June 30, 2019
Commercial real estate	$	—	$	—	$	1,238
Consumer real estate		676		278		—
Construction and land development		124		—		—
Commercial and industrial		616		—		—
Consumer		27		24		—
Other		—		—		—
Total	$	1,443	$	302	$	1,238

December 31, 2018
Commercial real estate	$	—	$	—	$	1,391
Consumer real estate		1,187		214		—
Construction and land development		19		—		—
Commercial and industrial		817		—		—
Consumer		55		—		—
Other		—		—		—
Total	$	2,078	$	214	$	1,391

Schedule of activity in purchased credit impaired loans

The following table presents changes in the carrying value of purchased credit impaired (“PCI”) loans (in thousands):

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Balance at beginning of period	$	1,608		$	1,620
Change due to payments received and accretion		(71	)		(83	)
Change due to loan charge-offs		—			—
Other		—			—
Balance at end of period	$	1,537		$	1,537

The following table presents changes in the accretable yield for PCI loans (in thousands):

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Balance at beginning of period	$	438		$	440
Accretion		(33	)		(45	)
Reclassification from (to) nonaccretable difference		—			—
Other, net					10
Balance at end of period	$	405		$	405

Premises and Equipment (Tables)

6 Months Ended

Jun. 30, 2019

Property Plant And Equipment [Abstract]

Summary of Lease Costs

Lease costs were as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
Operating lease cost	$	455	$	937
Short-term lease cost		—		—
Variable least cost		—		—
Total lease cost	$	455	$	937

Maturity Analysis of Operating Lease Liabilities and Reconciliation of Undiscounted Cash Flows

A maturity analysis of operating lease liabilities and reconciliation of the undiscounted cash flows to the total operating lease liability is as follows (in thousands):

	June 30, 2019
Lease payments due:
Within one year	$	1,536
After one but within two years		1,553
After two but within three years		1,517
After three but within four years		1,457
After four but within five years		1,221
After five years		8,267
Total undiscounted cash flows		15,551
Discount on cash flows		(2,662	)
Total lease liability	$	12,889

Federal Home Loan Bank Advances (Tables)

6 Months Ended

Jun. 30, 2019

Federal Home Loan Banks [Abstract]

Summary of Contractual Maturities and Average Effective Rates of Outstanding Advances

The following is a summary of the contractual maturities and average effective rates of outstanding advances (dollars in thousands):

	June 30, 2019					December 31, 2018
Year	Amount		Interest Rates			Amount		Interest Rates
2019	$	—		—		$	125,000		2.48	%
2020		10,000		2.42	%		—		—
2021		—		—			—		—
2022		—		—			—		—
2023		—		—			—		—
Thereafter		—		—			—		—
Total	$	10,000		2.42	%	$	125,000		2.48	%

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2019

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax

The following were changes in accumulated other comprehensive income (loss) by component, net of tax, for the six months ended June 30, 2019 and 2018 (dollars in thousands):

				Unrealized Gains			Unrealized
	Gains and			and Losses			Losses on
	Losses on			on Available			Securities
	Cash Flow			for Sale			Transferred to
	Hedges			Securities			Held to Maturity			Total
Six Months Ended June 30, 2019
Beginning Balance	$	(2,636	)	$	(680	)	$	—		$	(3,316	)
Other comprehensive income (loss) before reclassification, net of tax		(205	)		4,140			—			3,935
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(353	)		(80	)		—			(433	)
Net current period other comprehensive income (loss)		(558	)		4,060			—			3,502
Ending Balance	$	(3,194	)	$	3,380		$	—		$	186

Six Months Ended June 30, 2018
Beginning Balance	$	(3,679	)	$	1,162		$	(10	)	$	(2,527	)
Other comprehensive income (loss) before reclassification, net of tax		1,288			(3,643	)		20			(2,335	)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(435	)		2			(10	)		(443	)
Net current period other comprehensive income (loss)		853			(3,641	)		10			(2,778	)
Ending Balance	$	(2,826	)	$	(2,479	)	$	—		$	(5,305	)

Summary of Significant Amounts Reclassified out off Accumulated Other Comprehensive Income (Loss)

													Affected Line Item
Details about Accumulated Other	Three Months Ended June 30,						Six Months Ended June 30,						in the Statement Where
Comprehensive Income (Loss) Components	2019			2018			2019			2018			Net Income is Presented
Unrealized losses on cash flow hedges	$	(114	)	$	(111	)	$	(224	)	$	(218	)	Interest expense - money market
		(51	)		(113	)		(138	)		(257	)	Interest expense - Federal Home Loan Bank advances
		—			16			9			40		Income tax benefit
	$	(165	)	$	(208	)	$	(353	)	$	(435	)	Net of tax
Unrealized gains (losses) on available- for-sale securities	$	(121	)	$	3		$	(108	)	$	3		Net gain (loss) on sale of securities
		32			(1	)		28			(1	)	Income tax benefit (expense)
	$	(89	)	$	2		$	(80	)	$	2		Net of tax
Unrealized losses on securities transferred to held-to-maturity	$	—		$	—		$	—		$	(14	)	Interest income - securities
		—			—			—			4		Income tax benefit
	$	—		$	—		$	—		$	(10	)	Net of tax

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Schedule of Financial Instruments Representing Credit Risk

The following table sets forth outstanding financial instruments whose contract amounts represent credit risk as of June 30, 2019 and December 31, 2018 (dollars in thousands):

	Contract or notional amount
	June 30, 2019		December 31, 2018
Financial instruments whose contract amounts represent credit risk:
Unused commitments to extend credit	$	702,007	$	707,675
Standby letters of credit		11,124		12,273
Total	$	713,131	$	719,948

- Definition

Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed.

+ References + Details

Derivatives (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Summary of Interest-Rate Swaps Designated as Cash Flow Hedges

Summary information about the interest-rate swaps designated as cash flow hedges was as follows (dollars in thousands):

	June 30, 2019		December 31, 2018
Notional amounts	$	—	$	20,000
Weighted average pay rates		—		3.54	%
Weighted average receive rates		—	3 month LIBOR
Weighted average maturity		—	4.5 years
Fair value	$	—	$	(836	)
Amount of unrealized loss recognized in accumulated other comprehensive income, net of tax	$	—	$	(617	)

Summary of Customer Related Interest Rate Swaps

A summary of the Company’s customer related interest rate swaps was as follows (dollars in thousands):

	June 30, 2019					December 31, 2018
	Notional		Estimated			Notional		Estimated
	amount		fair value			amount		fair value
Interest rate swap agreements:
Pay fixed/receive variable swaps	$	27,940	$	(741	)	$	29,126	$	24
Pay variable/receive fixed swaps		27,940		741			29,126		(24	)
Total	$	55,880	$	—		$	58,252	$	—

Summary of Net Gains (Losses) Relating to Mortgage Banking Derivative Instruments Included in Mortgage Banking Income

The net gains (losses) relating to mortgage banking derivative instruments included in mortgage banking income were as follows (dollars in thousands):

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Mortgage loan interest rate lock commitments	$	592		$	592
Mortgage-backed securities forward sales commitments		(353	)		(353	)
Total	$	239		$	239

Summary of Amount and Fair Value of Mortgage Banking Derivative Instruments Included in Consolidated Balance Sheets

The amount and fair value of mortgage banking derivatives included in the consolidated balance sheets was as follows (dollars in thousands):

	June 30, 2019					December 31, 2018
	Notional		Estimated			Notional		Estimated
	amount		fair value			amount		fair value
Included in other assets:
Mortgage loan interest rate lock commitments	$	52,100	$	592		$	—	$	—
Included in other liabilities:
Mortgage-backed securities forward sales commitments	$	49,750	$	(278	)	$	—	$	—

Stock Options and Restricted Shares (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Company Recognized Stock-Based Compensation Expense

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
Stock-based compensation expense before income taxes	$	340		$	325		$	684		$	630
Less: deferred tax benefit		(89	)		(85	)		(179	)		(165	)
Reduction of net income	$	251		$	240		$	505		$	465

Summary of Changes in Company's Nonvested Restricted Shares

A summary of the changes in the Company’s nonvested restricted shares for the six months ended June 30, 2019 follows:

				Weighted
				Average
	Restricted			Grant Date
Nonvested Shares	Shares			Fair Value
Nonvested at beginning of period		157,616		$	17.00
Granted		30,183			15.91
Vested		(55,650	)		15.13
Forfeited		(11,801	)		17.73
Nonvested at end of period		120,348		$	17.52

Summary of Fair Value of Options Granted Using Weighted Average Assumptions

The fair value of options granted during 2019 was determined using the following weighted average assumptions as of the grant date.

	2019
Dividend yield		1.35	%
Expected term (in years)		6.50
Expected stock price volatility		29.55	%
Risk-free interest rate		2.25	%

Summary of Activity in Stock Options

A summary of the activity in stock options for the six months ended June 30, 2019 follows:

						Weighted
				Weighted		Average
				Average		Remaining
				Exercise		Contractual
	Shares			Price		Term (years)
Outstanding at beginning of period		507,903		$	8.66
Granted		50,000			14.84
Exercised		(218,954	)		6.68
Forfeited or expired		—			—
Outstanding at end of period		338,949		$	10.86		4.8
Fully vested and expected to vest		338,508		$	10.85		4.8
Exercisable at end of period		282,699		$	10.10		3.8

Information Related to Stock Options

Information related to stock options during each year follows:

	2019		2018
Intrinsic value of options exercised	$	2,007,300	$	2,081,344
Cash received from option exercises		1,253,233		2,186,420
Tax benefit realized from option exercises		14,979		544,063
Weighted average fair value of options granted		5.35		—

Regulatory Capital Requirements (Tables)

6 Months Ended

Jun. 30, 2019

Banking And Thrift [Abstract]

Schedule of Capital Amounts and Ratios

The Company’s and the Bank’s capital amounts and ratios as of June 30, 2019 and December 31, 2018 are presented in the following table (dollars in thousands).

	Actual					Minimum capital requirement (1)					Minimum to be well-capitalized (2)
	Amount		Ratio			Amount		Ratio			Amount		Ratio
At June 30, 2019:
Total capital to risk-weighted assets:
CapStar Financial Holdings, Inc.	$	228,302		13.29	%	$	137,394		8.00	%	N/A		N/A
CapStar Bank		213,170		12.41			137,368		8.00		$	171,710		10.00
Tier I capital to risk-weighted assets:
CapStar Financial Holdings, Inc.		215,220		12.53			103,046		6.00		N/A		N/A
CapStar Bank		200,088		11.65			103,026		6.00			137,368		8.00
Common equity Tier 1 capital to risk weighted assets:
CapStar Financial Holdings, Inc.		206,220		12.01			77,284		4.50		N/A		N/A
CapStar Bank		183,588		10.69			77,270		4.50			111,612		6.50
Tier I capital to average assets:
CapStar Financial Holdings, Inc.		215,220		11.01			78,224		4.00		N/A		N/A
CapStar Bank		200,088		10.24			78,186		4.00			97,733		5.00

At December 31, 2018:
Total capital to risk-weighted assets:
CapStar Financial Holdings, Inc.	$	222,030		12.84	%	$	138,336		8.00	%	N/A		N/A
CapStar Bank		201,972		11.68			138,294		8.00		$	172,868		10.00
Tier I capital to risk-weighted assets:
CapStar Financial Holdings, Inc.		209,738		12.13			103,752		6.00		N/A		N/A
CapStar Bank		189,680		10.97			103,721		6.00			138,294		8.00
Common equity Tier 1 capital to risk weighted assets:
CapStar Financial Holdings, Inc.		200,738		11.61			77,814		4.50		N/A		N/A
CapStar Bank		173,180		10.02			77,791		4.50			112,364		6.50
Tier I capital to average assets:
CapStar Financial Holdings, Inc.		209,738		11.06			75,867		4.00		N/A		N/A
CapStar Bank		189,680		10.01			75,828		4.00			94,785		5.00

(1)

(2)

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Summary of Basic and Diluted Earnings Per Share

The following is a summary of the basic and diluted earnings per share calculation for the three and six months ended June 30, 2019 and 2018 (dollars in thousands, except share data):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Basic net income per share calculation:
Numerator – Net income	$	5,756	$	3,513	$	10,535	$	6,707
Denominator – Average common shares outstanding		17,663,992		11,845,822		17,723,286		11,755,535
Basic net income per share	$	0.33	$	0.30	$	0.59	$	0.57
Diluted net income per share calculation:
Numerator – Net income	$	5,756	$	3,513	$	10,535	$	6,707
Denominator – Average common shares outstanding		17,663,992		11,845,822		17,723,286		11,755,535
Dilutive shares contingently issuable		986,714		1,221,401		1,017,036		1,266,209
Average diluted common shares outstanding		18,650,706		13,067,223		18,740,322		13,021,744
Diluted net income per share	$	0.31	$	0.27	$	0.56	$	0.52

Fair Value (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are summarized below (dollars in thousands):

	Fair value measurements at June 30, 2019
				Quoted prices
				in active		Significant
				markets for		other			Significant
				identical		observable			unobservable
	Carrying			assets		inputs			inputs
	Value			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities available-for-sale:
U.S. government-sponsored agencies	$	6,477		$	—	$	6,477		$	—
Obligations of states and political subdivisions		51,499			—		51,499			—
Mortgage-backed securities-residential		124,840			—		124,840			—
Asset-backed securities		3,299			—		3,299			—
Other debt securities		8,842			—		8,842			—
Loans held for sale		37,604			—		37,604			—
Derivative assets:
Non-hedging derivatives:
Interest rate swaps - customer related		752			—		752			—
Mortgage loan interest rate lock commitments		592			—		—			592
Liabilities:
Derivative liabilities:
Non-hedging derivatives:
Interest rate swaps - customer related		(752	)		—		(752	)		—
Mortgage-backed securities forward sales commitments		(278	)		—		(278	)		—

	Fair value measurements at December 31, 2018
				Quoted prices
				in active		Significant
				markets for		other			Significant
				identical		observable			unobservable
	Carrying			assets		inputs			inputs
	Value			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities available-for-sale:
U.S. government-sponsored agencies	$	10,706		$	—	$	10,706		$	—
Obligations of states and political subdivisions		61,926			—		61,926			—
Mortgage-backed securities-residential		144,158			—		144,158			—
Asset-backed securities		15,284			—		15,284			—
Other debt securities		11,734			—		11,734			—
Derivative assets:
Non-hedging derivatives:
Interest rate swaps - customer related		494			—		494			—
Liabilities:
Derivative liabilities:
Cash flow hedges:
Interest rate swaps - cash flow hedges		(836	)		—		(836	)		—
Non-hedging derivatives:
Interest rate swaps - customer related		(494	)		—		(494	)		—

Reconciliation of Assets Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Level 3)

	Mortgage Loan Interest Rate
	Lock Commitments
	2019		2018

Balance of recurring Level 3 assets at January 1st	$	—	$	—
Total gains or losses for the period:
Include in mortgage banking income		592		—
Balance of recurring Level 3 assets at June 30th	$	592	$	—

Summary of Quantitative Information About Level 3 Fair Value Measurements for Assets Measured at Fair Value on Recurring and Non-recurring Basis

					Range
	Fair		Valuation		(Weighted-
June 30, 2019	Value		Technique(s)	Unobservable Input(s)	Average)
Assets:
Non-hedging derivatives:
Mortgage loan interest rate lock commitments	$	592	Consensus pricing	Origination pull-through rate	68% - 96% (80%)

The following table presents quantitative information about Level 3 fair value measurements for assets measured at fair value on a non-recurring basis at June 30, 2019 (dollars in thousands):

Range

Fair

Valuation

(Weighted-

June 30, 2019

Value

Technique(s)

Unobservable Input(s)

Average)

Impaired loans:

Commercial and industrial

444

Sales Comparison approach

Appraisal discounts

25%

Summary of Assets Measured at Fair Value on a Nonrecurring Basis

Assets measured at fair value on a nonrecurring basis are summarized below (dollars in thousands): There were no assets measured at fair value on a nonrecurring basis at December 31, 2018.

Fair value measurements at June 30, 2019

Quoted prices

in active

Significant

markets for

other

Significant

identical

observable

unobservable

Carrying

assets

inputs

Value

(level 1)

(level 2)

(level 3)

Assets:

Impaired loans:

Commercial and industrial

444

—

444

Summary of Carrying Value and Fair Values of the Bank's Financial Instruments

The carrying value and estimated fair values of the Bank’s financial instruments at June 30, 2019 and December 31, 2018 were as follows (dollars in thousands):

	June 30, 2019				December 31, 2018
	Carrying				Carrying				Fair value
	amount		Fair value		amount		Fair value		level of input
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	$	156,085	$	156,085	$	94,681	$	94,681	Level 1
Federal funds sold		—		—		10,762		10,762	Level 1
Securities available-for-sale		194,957		194,957		243,808		243,808	Level 2
Securities held-to-maturity		3,721		3,820		3,734		3,785	Level 2
Loans held for sale		89,629		90,800		57,618		58,596	Level 2
Restricted equity securities		14,150	N/A			12,038	N/A		N/A
Loans		1,440,617		1,435,130		1,429,794		1,442,082	Level 3
Accrued interest receivable		6,045		6,045		5,964		5,964	Level 2
Other assets		35,157		35,157		34,489		34,489	Level 2 / Level 3
Financial liabilities:
Deposits		1,722,770		1,723,123		1,570,008		1,572,880	Level 3
Federal Home Loan Bank advances		10,000		10,000		125,000		126,548	Level 2
Other liabilities		1,606		1,606		2,753		2,753	Level 3

Summary of Significant Accounting Policies - Additional Information (Details) - Residential mortgage loans held for sale - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Mortgage banking income	$ 900,000	$ 900,000
Residential mortgage loans held for sale	37,604,000	37,604,000	$ 0
Greater than 89 Days Past Due
Summary Of Significant Accounting Policies [Line Items]
Mortgage loans past due over 89 days and nonaccrual	$ 0	$ 0	$ 0

Summary of Significant Accounting Policies - Summary of Difference Between the Fair Value and Aggregate Unpaid Principal Balance (Details) - Residential mortgage loans held for sale - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	$ 37,604,000	$ 0
Aggregate Unpaid Principal Balance	36,692,000
Difference	$ 912,000

Securities - Summary of Fair Value of Available for Sale Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities available for sale [Abstract]
Amortized Cost	$ 192,693	$ 247,042
Gross unrealized gains	3,326	1,616
Gross unrealized (losses)	(1,062)	(4,850)
Estimated fair value	194,957	243,808
Securities held to maturity [Abstract]
Amortized Cost	3,721	3,734
Gross unrealized gains	99	54
Gross unrealized (losses)		(3)
Estimated fair value	3,820	3,785
U. S. government agency securities
Securities available for sale [Abstract]
Amortized Cost	6,491	11,053
Gross unrealized gains	41
Gross unrealized (losses)	(55)	(347)
Estimated fair value	6,477	10,706
State and municipal securities
Securities available for sale [Abstract]
Amortized Cost	49,911	62,142
Gross unrealized gains	1,665	765
Gross unrealized (losses)	(77)	(981)
Estimated fair value	51,499	61,926
Securities held to maturity [Abstract]
Amortized Cost	3,721	3,734
Gross unrealized gains	99	54
Gross unrealized (losses)		(3)
Estimated fair value	3,820	3,785
Mortgage-backed securities
Securities available for sale [Abstract]
Amortized Cost	124,073	146,547
Gross unrealized gains	1,552	776
Gross unrealized (losses)	(785)	(3,165)
Estimated fair value	124,840	144,158
Asset-backed securities
Securities available for sale [Abstract]
Amortized Cost	3,402	15,437
Gross unrealized gains		4
Gross unrealized (losses)	(103)	(157)
Estimated fair value	3,299	15,284
Other debt securities
Securities available for sale [Abstract]
Amortized Cost	8,816	11,863
Gross unrealized gains	68	71
Gross unrealized (losses)	(42)	(200)
Estimated fair value	$ 8,842	$ 11,734

Securities - Summary of Securities with Unrealized Losses and Length of Time Continuous Loss Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	$ 7,286	$ 34,154
Less than 12 months, Gross unrealized (losses)	(125)	(574)
12 months or more, Estimated fair value	74,255	117,753
12 months or more, Gross unrealized losses	(937)	(4,279)
Total, Estimated fair value	81,541	151,907
Total, Gross unrealized losses	(1,062)	(4,853)
U. S. government agency securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
12 months or more, Estimated fair value	3,715	10,706
12 months or more, Gross unrealized losses	(55)	(347)
Total, Estimated fair value	3,715	10,706
Total, Gross unrealized losses	(55)	(347)
State and municipal securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value		13,455
Less than 12 months, Gross unrealized (losses)		(212)
12 months or more, Estimated fair value	6,340	17,376
12 months or more, Gross unrealized losses	(77)	(772)
Total, Estimated fair value	6,340	30,831
Total, Gross unrealized losses	(77)	(984)
Mortgage-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	3,002	7,075
Less than 12 months, Gross unrealized (losses)	(7)	(17)
12 months or more, Estimated fair value	61,711	87,232
12 months or more, Gross unrealized losses	(778)	(3,148)
Total, Estimated fair value	64,713	94,307
Total, Gross unrealized losses	(785)	(3,165)
Asset-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	3,299	8,262
Less than 12 months, Gross unrealized (losses)	(103)	(145)
12 months or more, Estimated fair value		2,439
12 months or more, Gross unrealized losses		(12)
Total, Estimated fair value	3,299	10,701
Total, Gross unrealized losses	(103)	(157)
Other debt securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	985	5,362
Less than 12 months, Gross unrealized (losses)	(15)	(200)
12 months or more, Estimated fair value	2,489
12 months or more, Gross unrealized losses	(27)
Total, Estimated fair value	3,474	5,362
Total, Gross unrealized losses	$ (42)	$ (200)

Securities - Additional Information (Details) $ in Millions	Jun. 30, 2019 USD ($) Security	Dec. 31, 2018 Security
Schedule Of Available For Sale Securities [Line Items]
Unrealized losses in investment securities portfolio	$ 1.1
Unrealized loss position \| Security	59	127
Public Deposits, Derivative Positions and Federal Home Loan Bank Advances
Schedule Of Available For Sale Securities [Line Items]
Market value of securities	$ 80.8

Securities - Summary of Amortized Cost and Fair Value of Debt and Equity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale, Amortized cost [Abstract]
Due in less than one year	$ 6,794
Due one to five years	24,757
Due five to ten years	30,966
Due beyond ten years	2,701
Amortized Cost	192,693	$ 247,042
Available-for-sale, Estimated fair value [Abstract]
Due in less than one year	6,870
Due one to five years	25,289
Due five to ten years	32,009
Due beyond ten years	2,650
Estimated fair value	194,957	243,808
Held-to-maturity, Amortized cost [Abstract]
Due in less than one year	998
Due one to five years	2,723
Amortized Cost	3,721	3,734
Securities held to maturity [Abstract]
Due in less than one year	999
Due one to five years	2,821
Estimated fair value	3,820	3,785
Mortgage-backed securities
Available-for-sale, Amortized cost [Abstract]
Amortized cost	124,073
Amortized Cost	124,073	146,547
Available-for-sale, Estimated fair value [Abstract]
Estimated fair value	124,840
Estimated fair value	124,840	144,158
Asset-backed securities
Available-for-sale, Amortized cost [Abstract]
Amortized cost	3,402
Amortized Cost	3,402	15,437
Available-for-sale, Estimated fair value [Abstract]
Estimated fair value	3,299
Estimated fair value	$ 3,299	$ 15,284

Loans and Allowance for Loan Losses - Summary of Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]
Total loans	$ 1,440,617		$ 1,429,794
Allowance for loan losses	(12,903)	$ (12,959)	(12,113)	$ (14,705)	$ (14,563)	$ (13,721)
Loans, net	1,427,714		1,417,681
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Total loans	594,812		550,446
Allowance for loan losses	(3,922)	(3,514)	(3,309)	(3,551)	(3,512)	(3,324)
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Total loans	255,043		253,562
Allowance for loan losses	(1,142)	(1,017)	(1,005)	(1,057)	(1,036)	(1,063)
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Total loans	123,901		174,670
Allowance for loan losses	(1,733)	(2,366)	(2,431)	(1,764)	(1,742)	(1,628)
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Total loans	404,745		404,600
Allowance for loan losses	(5,518)	(5,524)	(5,036)	(7,779)	(7,798)	(7,209)
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Total loans	26,704		25,615
Allowance for loan losses	(166)	(139)	(105)	(120)	(122)	(91)
Other
Loans And Leases Receivable Disclosure [Line Items]
Total loans	35,412		20,901
Allowance for loan losses	$ (422)	$ (399)	$ (227)	$ (434)	$ (353)	$ (406)

Loans and Allowance for Loan Losses - Additional Information (Details)		3 Months Ended		6 Months Ended
	Jun. 30, 2018 Contract	Jun. 30, 2019 USD ($) Contract	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2019 USD ($) Contract	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Minimum loan amount for loans analyzed by credit risk				$ 500,000
Total loans		$ 1,440,617,000		1,440,617,000		$ 1,429,794,000
Interest income recognized on a cash basis for impaired loans		0	$ 15,000	0	$ 25,000
Investment in TDR		1,200,000		1,200,000		1,400,000
Specific allowance related to loans		170,000		170,000
Additional commitments related to TDR		$ 0		$ 0		0
New TDR identified during the period \| Contract	0	0	0	0
TDR, payment default within twelve months \| Contract	0	0	0	0
Loan period considered as payment default				30 days
Troubled Debt Restructurings
Loans And Leases Receivable Disclosure [Line Items]
Specific allowance related to loans		$ 0		$ 0		0
Doubtful
Loans And Leases Receivable Disclosure [Line Items]
Total loans		$ 0		$ 0		$ 0

Loans and Allowance for Loan Losses - Summary of Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 12,959	$ 14,563	$ 12,113	$ 13,721
Charged-off loans	(118)	(91)	(200)	(251)
Recoveries	62	64	104	389
Provision for loan losses		169	886	846
Ending Balance	12,903	14,705	12,903	14,705
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,514	3,512	3,309	3,324
Recoveries	6	6	12	10
Provision for loan losses	402	33	601	217
Ending Balance	3,922	3,551	3,922	3,551
Consumer real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,017	1,036	1,005	1,063
Recoveries	13	1	16	2
Provision for loan losses	112	20	121	(8)
Ending Balance	1,142	1,057	1,142	1,057
Construction and land development
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	2,366	1,742	2,431	1,628
Provision for loan losses	(633)	22	(698)	136
Ending Balance	1,733	1,764	1,733	1,764
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	5,524	7,798	5,036	7,209
Charged-off loans	(26)	(79)	(26)	(226)
Recoveries	14	53	16	326
Provision for loan losses	6	7	492	470
Ending Balance	5,518	7,779	5,518	7,779
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	139	122	105	91
Charged-off loans	(41)	(12)	(78)	(25)
Recoveries	22	4	41	51
Provision for loan losses	46	6	98	3
Ending Balance	166	120	166	120
Other
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	399	353	227	406
Charged-off loans	(51)		(96)
Recoveries	7		19
Provision for loan losses	67	81	272	28
Ending Balance	$ 422	$ 434	$ 422	$ 434

Loans and Allowance for Loan Losses - Summary of Breakdown of Allowance for Loan Losses and Loan Portfolio by Loan Category (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses:
Collectively evaluated for impairment	$ 12,733		$ 12,113
Individually evaluated for impairment	170
Allowance for Loan Losses, Ending Balance	12,903	$ 12,959	12,113	$ 14,705	$ 14,563	$ 13,721
Loans:
Collectively evaluated for impairment	1,436,888		1,425,896
Individually evaluated for impairment	2,192		2,278
Acquired with deteriorated credit quality	1,537		1,620
Total	1,440,617		1,429,794
Commercial real estate
Allowance for Loan Losses:
Collectively evaluated for impairment	3,922		3,309
Allowance for Loan Losses, Ending Balance	3,922	3,514	3,309	3,551	3,512	3,324
Loans:
Collectively evaluated for impairment	593,463		549,055
Individually evaluated for impairment	1,238		1,278
Acquired with deteriorated credit quality	111		113
Total	594,812		550,446
Consumer real estate
Allowance for Loan Losses:
Collectively evaluated for impairment	1,142		1,005
Allowance for Loan Losses, Ending Balance	1,142	1,017	1,005	1,057	1,036	1,063
Loans:
Collectively evaluated for impairment	254,144		252,640
Individually evaluated for impairment	213		183
Acquired with deteriorated credit quality	686		739
Total	255,043		253,562
Construction and land development
Allowance for Loan Losses:
Collectively evaluated for impairment	1,733		2,431
Allowance for Loan Losses, Ending Balance	1,733	2,366	2,431	1,764	1,742	1,628
Loans:
Collectively evaluated for impairment	123,777		174,662
Individually evaluated for impairment	117
Acquired with deteriorated credit quality	7		8
Total	123,901		174,670
Commercial and industrial
Allowance for Loan Losses:
Collectively evaluated for impairment	5,348		5,036
Individually evaluated for impairment	170
Allowance for Loan Losses, Ending Balance	5,518	5,524	5,036	7,779	7,798	7,209
Loans:
Collectively evaluated for impairment	403,427		403,054
Individually evaluated for impairment	616		817
Acquired with deteriorated credit quality	702		729
Total	404,745		404,600
Consumer
Allowance for Loan Losses:
Collectively evaluated for impairment	166		105
Allowance for Loan Losses, Ending Balance	166	139	105	120	122	91
Loans:
Collectively evaluated for impairment	26,665		25,584
Individually evaluated for impairment	8
Acquired with deteriorated credit quality	31		31
Total	26,704		25,615
Other
Allowance for Loan Losses:
Collectively evaluated for impairment	422		227
Allowance for Loan Losses, Ending Balance	422	$ 399	227	$ 434	$ 353	$ 406
Loans:
Collectively evaluated for impairment	35,412		20,901
Total	$ 35,412		$ 20,901

Loans and Allowance for Loan Losses - Allocation of ALL with Corresponding Percentage of ALL in Each Category to Total Loans, Net of Deferred Fee (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 12,903	$ 12,959	$ 12,113	$ 14,705	$ 14,563	$ 13,721
Allowance for loan losses, Percentage of total loans	0.90%		0.85%
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 3,922	3,514	$ 3,309	3,551	3,512	3,324
Allowance for loan losses, Percentage of total loans	0.27%		0.23%
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 1,142	1,017	$ 1,005	1,057	1,036	1,063
Allowance for loan losses, Percentage of total loans	0.08%		0.07%
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 1,733	2,366	$ 2,431	1,764	1,742	1,628
Allowance for loan losses, Percentage of total loans	0.12%		0.17%
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 5,518	5,524	$ 5,036	7,779	7,798	7,209
Allowance for loan losses, Percentage of total loans	0.39%		0.35%
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 166	139	$ 105	120	122	91
Allowance for loan losses, Percentage of total loans	0.01%		0.01%
Other
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan losses, Amount	$ 422	$ 399	$ 227	$ 434	$ 353	$ 406
Allowance for loan losses, Percentage of total loans	0.03%		0.02%

Loans and Allowance for Loan Losses - Summary of Impaired Loans Evaluated for Specific Loss Allowance (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	$ 3,115	$ 3,898
Impaired loans with no related allowance recorded, Unpaid principal balance	4,420	9,403
Impaired loans with an allowance recorded, Related allowance	170
Impaired loans with an allowance recorded, Recorded investment	614
Impaired loans with an allowance recorded, Unpaid principal balance	4,744
Recorded investment	3,729	3,898
Unpaid principal balance	9,164	9,403
Commercial real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,349	1,391
Impaired loans with no related allowance recorded, Unpaid principal balance	1,416	1,775
Consumer real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	899	922
Impaired loans with no related allowance recorded, Unpaid principal balance	1,307	1,204
Construction and land development
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	124	8
Impaired loans with no related allowance recorded, Unpaid principal balance	151	18
Commercial and industrial
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	704	1,546
Impaired loans with no related allowance recorded, Unpaid principal balance	1,478	6,350
Impaired loans with an allowance recorded, Related allowance	170
Impaired loans with an allowance recorded, Recorded investment	614
Impaired loans with an allowance recorded, Unpaid principal balance	4,744
Consumer
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	39	31
Impaired loans with no related allowance recorded, Unpaid principal balance	$ 68	$ 56

Loans and Allowance for Loan Losses - Summary of Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	$ 3,153	$ 1,181	$ 3,163	$ 1,189
Impaired loans with no related allowance recorded, Interest income recognized	43	15	59	25
Impaired loans with an allowance recorded, Average recorded investment	732	5,425	760	5,345
Impaired loans with an allowance recorded, Interest income recognized		31		118
Average recorded investment	3,885	6,606	3,923	6,534
Interest income recognized	43	46	59	143
Commercial real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	1,356	1,181	1,365	1,189
Impaired loans with no related allowance recorded, Interest income recognized	19	15	35	25
Consumer real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	916		917
Impaired loans with no related allowance recorded, Interest income recognized	4		4
Construction and land development
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	128		128
Impaired loans with no related allowance recorded, Interest income recognized	1		1
Commercial and industrial
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	709		709
Impaired loans with no related allowance recorded, Interest income recognized	19		19
Impaired loans with an allowance recorded, Average recorded investment	732	5,425	760	5,345
Impaired loans with an allowance recorded, Interest income recognized		$ 31		$ 118
Consumer
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	$ 44		$ 44

Loans and Allowance for Loan Losses - Schedule of Aging of Recorded Investment in Past-due Loans, by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 4,635	$ 1,595
Loans Not Past Due	1,435,982	1,428,199
Total	1,440,617	1,429,794
Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,307	527
Loans Not Past Due	593,505	549,919
Total	594,812	550,446
Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,058	919
Loans Not Past Due	252,985	252,643
Total	255,043	253,562
Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	51
Loans Not Past Due	123,850	174,670
Total	123,901	174,670
Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	974	54
Loans Not Past Due	403,771	404,546
Total	404,745	404,600
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	245	95
Loans Not Past Due	26,459	25,520
Total	26,704	25,615
Other
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	35,412	20,901
Total	35,412	20,901
30 - 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	628	475
30 - 59 Days Past Due \| Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		300
30 - 59 Days Past Due \| Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	378	69
30 - 59 Days Past Due \| Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	89	54
30 - 59 Days Past Due \| Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	161	52
60 - 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,605	302
60 - 89 Days Past Due \| Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,307	227
60 - 89 Days Past Due \| Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	947	75
60 - 89 Days Past Due \| Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	51
60 - 89 Days Past Due \| Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	271
60 - 89 Days Past Due \| Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	29
Greater than 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,402	818
Greater than 89 Days Past Due \| Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	733	775
Greater than 89 Days Past Due \| Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	614
Greater than 89 Days Past Due \| Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 54	$ 43

Loans and Allowance for Loan Losses - Schedule of Non-Accrual Loans, Past Due Loans over 89 Days Outstanding and Accruing and Troubled Debt Restructurings (TDR) by Class of Loans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	$ 1,443	$ 2,078
Past Due Over 89 Days and Accruing	302	214
Troubled Debt Restructurings	1,238	1,391
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Troubled Debt Restructurings	1,238	1,391
Consumer real estate
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	676	1,187
Past Due Over 89 Days and Accruing	278	214
Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	124	19
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	616	817
Consumer
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	27	$ 55
Past Due Over 89 Days and Accruing	$ 24

Premises and Equipment - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Property Plant And Equipment [Abstract]
Operating lease, liability	$ 12,889,000		$ 12,889,000
Operating lease, right-of-use asset	$ 12,200,000		$ 12,200,000
Operating lease, weighted average remaining lease term	11 years 1 month 6 days		11 years 1 month 6 days
Operating lease, weighted average discount rate, percent	3.53%		3.53%
Operating leases, rent expense		$ 415,000,000		$ 809,000,000
Sale and leaseback transaction	$ 0	$ 0	$ 0	$ 0

Premises and Equipment - Maturity Analysis of Operating Lease Liabilities and Reconciliation of Undiscounted Cash Flows (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Lease payments due:
Within one year	$ 1,536
After one but within two years	1,553
After two but within three years	1,517
After three but within four years	1,457
After four but within five years	1,221
After five years	8,267
Total undiscounted cash flows	15,551
Discount on cash flows	(2,662)
Operating lease, liability	$ 12,889

Federal Home Loan Bank Advances - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Federal Home Loan Bank Advances [Line Items]
Outstanding borrowings	$ 10,000	$ 125,000
Investment securities, FHLB stock and commercial and residential real estate mortgage loans
Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank Advances Collateralized Investment Securities Value	4,100
Mortgage loans collateralized amount	728,500
Amount of available credit	$ 150,700

Federal Home Loan Bank Advances - Summary of Contractual Maturities and Average Effective Rates of Outstanding Advances (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Federal Home Loan Bank Advances Maturities Summary [Abstract]
2019		$ 125,000
2020	$ 10,000
Total amount	$ 10,000	$ 125,000
2019		2.48%
2020	2.42%
Total interest rates	2.42%	2.48%

Accumulated Other Comprehensive Income (Loss) - Summary of Changes In Accumulated Other Comprehensive Income (Loss) By Component, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 259,751	$ 254,379	$ 148,691	$ 146,946	$ 254,379	$ 146,946
Other comprehensive income (loss) before reclassification, net of tax					3,935	(2,335)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax					(433)	(443)
Other comprehensive income (loss)	1,090	2,412	(111)	(2,667)	3,502	(2,778)
Ending balance	262,664	259,751	153,146	148,691	262,664	153,146
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(2,636)		(3,679)	(2,636)	(3,679)
Other comprehensive income (loss) before reclassification, net of tax					(205)	1,288
Amounts reclassified from accumulated other comprehensive income (loss), net of tax					(353)	(435)
Other comprehensive income (loss)					(558)	853
Ending balance	(3,194)		(2,826)		(3,194)	(2,826)
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(680)		1,162	(680)	1,162
Other comprehensive income (loss) before reclassification, net of tax					4,140	(3,643)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax					(80)	2
Other comprehensive income (loss)					4,060	(3,641)
Ending balance	3,380		(2,479)		3,380	(2,479)
Unrealized Losses on Securities Transferred to Held to Maturity
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance				(10)		(10)
Other comprehensive income (loss) before reclassification, net of tax						20
Amounts reclassified from accumulated other comprehensive income (loss), net of tax						(10)
Other comprehensive income (loss)						10
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(904)	(3,316)	(5,194)	(2,527)	(3,316)	(2,527)
Other comprehensive income (loss)	1,090	2,412	(111)	(2,667)	3,502	(2,778)
Ending balance	$ 186	$ (904)	$ (5,305)	$ (5,194)	$ 186	$ (5,305)

Accumulated Other Comprehensive Income (Loss) - Summary of Significant Amounts Reclassified out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net gain (loss) on sale of securities					$ (108)	$ 3
Interest expense - Federal Home Loan Bank advances	$ (324)		$ (627)		(1,156)	(1,117)
Income tax benefit (expense)	(1,814)		(665)		(3,160)	(1,148)
Net income	5,756	$ 4,779	3,513	$ 3,194	10,535	6,707
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Losses on Cash Flow Hedges
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest expense money market	(114)		(111)		(224)	(218)
Interest expense - Federal Home Loan Bank advances	(51)		(113)		(138)	(257)
Income tax benefit (expense)			16		9	40
Net income	(165)		(208)		(353)	(435)
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gains (Losses) on Available for Sale Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net gain (loss) on sale of securities	(121)		3		(108)	3
Income tax benefit (expense)	32		(1)		28	(1)
Net income	$ (89)		$ 2		$ (80)	2
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Losses on Securities Transferred to Held to Maturity
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest income - securities						(14)
Income tax benefit (expense)						4
Net income						$ (10)

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes [Line Items]
Effective tax rate	24.00%	15.90%	23.10%	14.60%
Income tax increase (decrease)	$ 2,000	$ (277,000)	$ (31,000)	$ (640,000)
Federal statutory income tax rate			21.00%
Tennessee \| State and Local Jurisdiction
Income Taxes [Line Items]
Excise tax rate			6.50%

Derivatives - Additional Information (Details) - Designated as Hedging Instrument - Interest Rate Swaps - Cash Flow Hedges - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Notional amounts	$ 0			$ 20,000,000
Derivative termination fees	1,500,000
Investment securities pledged collateral to counterparties	1,900,000
Investment securities pledged collateral from counterparties	$ 0
Gains (losses) relating to mortgage banking derivative instruments		$ 0	$ 0

Derivatives - Summary of Interest-Rate Swaps Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument - Cash Flow Hedges - Interest Rate Swaps - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2019
Derivative [Line Items]
Notional amounts	$ 20,000,000	$ 0
Weighted average pay rates	3.54%
Weighted average receive rates	3 month LIBOR
Weighted average maturity	4 years 6 months
Fair value	$ (836,000)
Amount of unrealized loss recognized in accumulated other comprehensive income, net of tax	$ (617,000)

Derivatives - Summary of Amount and Fair Value of Mortgage Banking Derivative Instruments Included in Consolidated Balance Sheets (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Other Assets \| Mortgage Loan Interest Rate Lock Commitments
Derivative [Line Items]
Notional amount, assets	$ 52,100
Estimated fair value, asset	592
Other Liabilities \| Mortgage-Backed Securities Forward Sales Commitments
Derivative [Line Items]
Notional amount, liabilities	49,750
Estimated fair value, liabilities	$ (278)

Stock Options and Restricted Shares - Additional Information (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Apr. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost		$ 2.6
Total fair value of shares vested	$ 1.6	$ 0.9
Vesting period		4 years
Contractual term		10 years
Options granted		50,000	0
Unrecognized compensation cost		$ 0.3
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost expected to be recognized over a weighted-average period		1 year 10 months 24 days
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost expected to be recognized over a weighted-average period		2 years 9 months 18 days
CapStar Bank 2008 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of stock reserved for issuance of stock incentives		1,569,475
Shares issuable under both restricted share and stock option grants		354,518
CapStar Bank 2008 Stock Incentive Plan \| Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of stock reserved for issuance of stock incentives				400,000

Stock Options and Restricted Shares - Summary of Company Recognized Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based compensation expense before income taxes	$ 340	$ 325	$ 684	$ 630
Less: deferred tax benefit	(89)	(85)	(179)	(165)
Reduction of net income	$ 251	$ 240	$ 505	$ 465

Stock Options and Restricted Shares - Summary of Changes in Company's Nonvested Restricted Shares (Details)	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Restricted Shares, Abstract
Restricted Shares, Nonvested Beginning Balance \| shares	157,616
Restricted Shares, Granted \| shares	30,183
Restricted Shares, Vested \| shares	(55,650)
Restricted Shares, Forfeited \| shares	(11,801)
Restricted Shares, Nonvested Ending Balance \| shares	120,348
Weighted Average Grant Date Fair Value, Abstract
Weighted Average Grant Date Fair Value, Nonvested Beginning Balance \| $ / shares	$ 17.00
Weighted Average Grant Date Fair Value, Granted \| $ / shares	15.91
Weighted Average Grant Date Fair Value, Vested \| $ / shares	15.13
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	17.73
Weighted Average Grant Date Fair Value, Nonvested Ending Balance \| $ / shares	$ 17.52

Stock Options and Restricted Shares - Summary of Fair Value of Options Granted Using Weighted Average Assumptions (Details)	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Dividend yield	1.35%
Expected term (in years)	6 years 6 months
Expected stock price volatility	29.55%
Risk-free interest rate	2.25%

Stock Options and Restricted Shares - Summary of Activity in Stock Options (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Shares, Abstract
Shares Outstanding, Beginning Balance \| shares	507,903
Shares Outstanding, Granted \| shares	50,000	0
Shares Outstanding, Exercised \| shares	(218,954)
Shares Outstanding, Ending Balance \| shares	338,949	507,903
Shares, Fully Vested and Expected to Vest \| shares	338,508
Shares, Exercisable at End of Period \| shares	282,699
Weighted Average Exercise Price, Abstract
Weighted Average Exercise Price Outstanding, Beginning Balance \| $ / shares	$ 8.66
Weighted Average Exercise Price Outstanding, Granted \| $ / shares	14.84
Weighted Average Exercise Price Outstanding, Exercised \| $ / shares	6.68
Weighted Average Exercise Price Outstanding, Ending Balance \| $ / shares	10.86	$ 8.66
Weighted Average Exercise Price, Fully vested and expected to vest \| $ / shares	10.85
Weighted Average Exercise Price, Exercisable at End of Period \| $ / shares	$ 10.10
Weighted Average Remaining Contractual Term (year), Abstract
Weighted Average Remaining Contractual Term Outstanding	4 years 9 months 18 days
Weighted Average Remaining Contractual Term, Fully Vested and Expected to Vest	4 years 9 months 18 days
Weighted Average Remaining Contractual Term, Exercisable at End of Period	3 years 9 months 18 days

Stock Options and Restricted Shares - Information Related to Stock Options (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Intrinsic value of options exercised	$ 2,007,300	$ 2,081,344
Cash received from option exercises	1,253,233	2,186,420
Tax benefit realized from option exercises	$ 14,979	$ 544,063
Weighted average fair value of options granted	$ 5.35

Regulatory Capital Requirements - Schedule of Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands

Jun. 30, 2019

Dec. 31, 2018

CapStar Financial Holdings, Inc.

Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]

Total capital to risk-weighted assets, actual amount

$ 228,302

$ 222,030

Tier I capital to risk-weighted assets, actual amount

215,220

209,738

Tier I capital to average assets, actual amount

$ 215,220

$ 209,738

Total capital to risk-weighted assets, actual ratio

13.29%

12.84%

Tier I capital to risk-weighted assets, actual ratio

12.53%

12.13%

Tier I capital to average assets, actual ratio

11.01%

11.06%

Total capital to risk-weighted assets, minimum capital requirement amount

^[1]

$ 137,394

$ 138,336

Tier I capital to risk-weighted assets, minimum capital requirement amount

^[1]

103,046

103,752

Tier I capital to average assets, minimum capital requirement amount

^[1]

$ 78,224

$ 75,867

Total capital to risk-weighted assets, minimum capital requirement ratio

^[1]

8.00%

Tier I capital to risk-weighted assets, minimum capital requirement ratio

^[1]

6.00%

Tier I capital to average assets, minimum capital requirement ratio

^[1]

4.00%

CapStar Financial Holdings, Inc. | Common Stock

Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]

Tier I capital to risk-weighted assets, actual amount

$ 206,220

$ 200,738

Tier I capital to risk-weighted assets, actual ratio

12.01%

11.61%

Tier I capital to risk-weighted assets, minimum capital requirement amount

^[1]

$ 77,284

$ 77,814

Tier I capital to risk-weighted assets, minimum capital requirement ratio

^[1]

4.50%

CapStar Bank

Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]

Total capital to risk-weighted assets, actual amount

$ 213,170

$ 201,972

Tier I capital to risk-weighted assets, actual amount

200,088

189,680

Tier I capital to average assets, actual amount

$ 200,088

$ 189,680

Total capital to risk-weighted assets, actual ratio

12.41%

11.68%

Tier I capital to risk-weighted assets, actual ratio

11.65%

10.97%

Tier I capital to average assets, actual ratio

10.24%

10.01%

Total capital to risk-weighted assets, minimum capital requirement amount

^[1]

$ 137,368

$ 138,294

Tier I capital to risk-weighted assets, minimum capital requirement amount

^[1]

103,026

103,721

Tier I capital to average assets, minimum capital requirement amount

^[1]

$ 78,186

$ 75,828

Total capital to risk-weighted assets, minimum capital requirement ratio

^[1]

8.00%

Tier I capital to risk-weighted assets, minimum capital requirement ratio

^[1]

6.00%

Tier I capital to average assets, minimum capital requirement ratio

^[1]

4.00%

Total capital to risk-weighted assets, minimum to be well capitalized amount

^[2]

$ 171,710

$ 172,868

Tier I capital to risk-weighted assets, minimum to be well capitalized amount

^[2]

137,368

138,294

Tier I capital to average assets, minimum to be well capitalized amount

^[2]

$ 97,733

$ 94,785

Total capital to risk-weighted assets, minimum to be well capitalized ratio

^[2]

10.00%

Tier I capital to risk-weighted assets, minimum to be well capitalized ratio

^[2]

8.00%

Tier I capital to average assets, minimum to be well capitalized ratio

^[2]

5.00%

CapStar Bank | Common Stock

Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]

Tier I capital to risk-weighted assets, actual amount

$ 183,588

$ 173,180

Tier I capital to risk-weighted assets, actual ratio

10.69%

10.02%

Tier I capital to risk-weighted assets, minimum capital requirement amount

^[1]

$ 77,270

$ 77,791

Tier I capital to risk-weighted assets, minimum capital requirement ratio

^[1]

4.50%

Tier I capital to risk-weighted assets, minimum to be well capitalized amount

^[2]

$ 111,612

$ 112,364

Tier I capital to risk-weighted assets, minimum to be well capitalized ratio

^[2]

6.50%

[1]	For the calendar year 2019, the Company must maintain a capital conservation buffer of Tier 1 common equity capital in excess of minimum risk-based capital ratios by at least 2.5% to avoid limits on capital distributions and certain discretionary bonus payments to executive officers and similar employees.
[2]	For the Company to be well-capitalized, the Bank must be well-capitalized and the Company must not be subject to any written agreement, order, capital directive, or prompt corrective action directive issued by the Federal Reserve to meet and maintain a specific capital level for any capital measure.

Earning Per Share - Summary of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic net income per share calculation:
Numerator – Net income	$ 5,756	$ 3,513	$ 10,535	$ 6,707
Denominator – Average common shares outstanding	17,663,992	11,845,822	17,723,286	11,755,535
Basic net income per share of common stock	$ 0.33	$ 0.30	$ 0.59	$ 0.57
Diluted net income per share calculation:
Numerator – Net income	$ 5,756	$ 3,513	$ 10,535	$ 6,707
Denominator – Average common shares outstanding	17,663,992	11,845,822	17,723,286	11,755,535
Dilutive shares contingently issuable	986,714	1,221,401	1,017,036	1,266,209
Average diluted common shares outstanding	18,650,706	13,067,223	18,740,322	13,021,744
Diluted net income per share of common stock	$ 0.31	$ 0.27	$ 0.56	$ 0.52

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

Fair Value - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Assets:
Securities available-for-sale, at fair value	$ 194,957,000	$ 243,808,000
Loans held for sale carried at fair value	37,604,000	0
Obligations of States and Political Subdivisions
Assets:
Securities available-for-sale, at fair value	51,499,000	61,926,000
Asset-backed securities
Assets:
Securities available-for-sale, at fair value	3,299,000	15,284,000
Other debt securities
Assets:
Securities available-for-sale, at fair value	8,842,000	11,734,000
Significant Unobservable Inputs (Level 3) \| Mortgage Loan Interest Rate Lock Commitments \| Non-hedging derivatives
Derivative assets:
Residential mortgage loans held for sale	592,000
Fair Value Measurements Recurring Basis
Assets:
Loans held for sale carried at fair value	37,604,000
Fair Value Measurements Recurring Basis \| U.S. Government-sponsored Agencies
Assets:
Securities available-for-sale, at fair value	6,477,000	10,706,000
Fair Value Measurements Recurring Basis \| Obligations of States and Political Subdivisions
Assets:
Securities available-for-sale, at fair value	51,499,000	61,926,000
Fair Value Measurements Recurring Basis \| Mortgage-backed Securities-residential
Assets:
Securities available-for-sale, at fair value	124,840,000	144,158,000
Fair Value Measurements Recurring Basis \| Asset-backed securities
Assets:
Securities available-for-sale, at fair value	3,299,000	15,284,000
Fair Value Measurements Recurring Basis \| Other debt securities
Assets:
Securities available-for-sale, at fair value	8,842,000	11,734,000
Fair Value Measurements Recurring Basis \| Mortgage Loan Interest Rate Lock Commitments \| Non-hedging derivatives
Derivative assets:
Residential mortgage loans held for sale	592,000
Fair Value Measurements Recurring Basis \| Forward Sales Commitments \| Non-hedging derivatives
Derivative liabilities:
Mortgage-backed securities forward sales commitments	(278,000)
Fair Value Measurements Recurring Basis \| Interest Rate Swaps - Customer Related \| Non-hedging derivatives
Derivative assets:
Interest rate swaps - customer related	752,000	494,000
Derivative liabilities:
Total derivative liabilities	(752,000)	(494,000)
Fair Value Measurements Recurring Basis \| Interest Rate Swaps - Cash Flow Hedges
Derivative liabilities:
Total derivative liabilities		(836,000)
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2)
Assets:
Loans held for sale carried at fair value	37,604,000
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| U.S. Government-sponsored Agencies
Assets:
Securities available-for-sale, at fair value	6,477,000	10,706,000
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Obligations of States and Political Subdivisions
Assets:
Securities available-for-sale, at fair value	51,499,000	61,926,000
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed Securities-residential
Assets:
Securities available-for-sale, at fair value	124,840,000	144,158,000
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Asset-backed securities
Assets:
Securities available-for-sale, at fair value	3,299,000	15,284,000
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Other debt securities
Assets:
Securities available-for-sale, at fair value	8,842,000	11,734,000
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Forward Sales Commitments \| Non-hedging derivatives
Derivative liabilities:
Mortgage-backed securities forward sales commitments	(278,000)
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Interest Rate Swaps - Customer Related \| Non-hedging derivatives
Derivative assets:
Interest rate swaps - customer related	752,000	494,000
Derivative liabilities:
Total derivative liabilities	(752,000)	(494,000)
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Interest Rate Swaps - Cash Flow Hedges
Derivative liabilities:
Total derivative liabilities		$ (836,000)
Fair Value Measurements Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Mortgage Loan Interest Rate Lock Commitments \| Non-hedging derivatives
Derivative assets:
Residential mortgage loans held for sale	$ 592,000

Fair Value - Reconciliation of Assets Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Level 3) (Details) - Mortgage Loan Interest Rate Lock Commitments - Significant Unobservable Inputs (Level 3) - Fair Value Measurements Recurring Basis $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Gains or losses include in mortgage banking income	$ 592
Balance of recurring Level 3 assets at June 30th	$ 592

Fair Value - Summary of Quantitative Information About Level 3 Fair Value Measurements on Recurring Basis (Details) - Significant Unobservable Inputs (Level 3) - Mortgage Loan Interest Rate Lock Commitments - Non-hedging derivatives $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Residential mortgage loans held for sale	$ 592
Valuation Technique(s)	Consensus pricing
Unobservable Input(s)	Origination pull-through rate
Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range	0.0068
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range	0.0096
Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range	0.0080

Fair Value - Summary of Quantitative Information About Level 3 Fair Value Measurements for Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Commercial and industrial $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	$ 444
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	$ 444
Valuation Technique(s)	Sales Comparison approach
Unobservable Input(s)	Appraisal discounts
Range (Weighted-Average)	25.00%

Fair Value - Summary of Carrying Value and Fair Values of the Bank's Financial Instruments (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Financial assets:
Estimated fair value	$ 194,957,000	$ 243,808,000
Securities held to maturity, fair value	3,820,000	3,785,000
Loans held for sale	37,604,000	0
Carrying amount
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	156,085,000	94,681,000
Federal funds sold		10,762,000
Estimated fair value	194,957,000	243,808,000
Securities held to maturity, fair value	3,721,000	3,734,000
Loans held for sale	89,629,000	57,618,000
Restricted equity securities	14,150,000	12,038,000
Loans	1,440,617,000	1,429,794,000
Accrued interest receivable	6,045,000	5,964,000
Other assets	35,157,000	34,489,000
Financial liabilities:
Deposits	1,722,770,000	1,570,008,000
Federal Home Loan Bank advances	10,000,000	125,000,000
Other liabilities	1,606,000	2,753,000
Fair value
Financial assets:
Loans	1,435,130,000	1,442,082,000
Fair value \| Level 1
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	156,085,000	94,681,000
Federal funds sold		10,762,000
Fair value \| Level 2
Financial assets:
Estimated fair value	194,957,000	243,808,000
Securities held to maturity, fair value	3,820,000	3,785,000
Loans held for sale	90,800,000	58,596,000
Accrued interest receivable	6,045,000	5,964,000
Financial liabilities:
Federal Home Loan Bank advances	10,000,000	126,548,000
Fair value \| Level 2 / Level 3
Financial assets:
Other assets	35,157,000	34,489,000
Fair value \| Level 3
Financial liabilities:
Deposits	1,723,123,000	1,572,880,000
Other liabilities	$ 1,606,000	$ 2,753,000

Derivatives - Summary of Customer Related Interest Rate Swaps (Details) - Interest Rate Swaps - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Interest rate swap, Notional amount	$ 55,880,000	$ 58,252,000
Pay fixed/receive variable swaps
Derivative [Line Items]
Interest rate swap, Notional amount	27,940,000	29,126,000
Interest rate swap, Estimated fair value	(741,000)	24,000
Pay variable/receive fixed swaps
Derivative [Line Items]
Interest rate swap, Notional amount	27,940,000	29,126,000
Interest rate swap, Estimated fair value	$ 741,000	$ (24,000)

Regulatory Capital Requirements - Schedule of Capital Amounts and Ratios (Parenthetical) (Details)	Jun. 30, 2019
Banking And Thrift [Abstract]
Minimum risk based capital ratios	2.50%

Loans and Allowance for Loan Losses - Schedule of activity in purchased credit impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule [Line Items]
Balance, beginning , carrying value	$ 1,608	$ 1,620
Change due to payments received and accretion	(71)	(83)
Balance, ending, carrying value	1,537	1,537
Accretable Yield For PCI Loans
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule [Line Items]
Balance, beginning , carrying value	438	440
Other		10
Balance, ending, carrying value	405	405
Accretion	$ (33)	$ (45)

Commitments and Contingencies - Schedule of Financial Instruments Representing Credit Risk (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Unused commitments to extend credit	$ 702,007	$ 707,675
Standby letters of credit	11,124	12,273
Total	$ 713,131	$ 719,948

Fair Value - Additional Information (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Other real estate owned	$ 0	$ 0
Loans held for sale carried at fair value	$ 37,604,000	$ 0