Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 29, 2019
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
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
Voting
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		17,546,691
Nonvoting
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		132,561

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 14,459	$ 17,967
Interest-bearing deposits in financial institutions	97,737	76,714
Federal funds sold	8,125	10,762
Total cash and cash equivalents	120,321	105,443
Securities available-for-sale, at fair value	233,691	243,808
Securities held-to-maturity, fair value of $3,806 and $3,785 at March 31, 2019 and December 31, 2018, respectively	3,727	3,734
Loans held for sale	72,870	57,618
Loans	1,467,786	1,429,794
Less allowance for loan losses	(12,959)	(12,113)
Loans, net	1,454,827	1,417,681
Premises and equipment, net	19,632	18,821
Restricted equity securities	14,145	12,038
Accrued interest receivable	6,446	5,964
Goodwill	37,510	37,510
Core deposit intangible, net	8,108	8,538
Other real estate owned, net	1,038	988
Other assets	63,496	51,740
Total assets	2,035,811	1,963,883
Deposits:
Non-interest-bearing	312,597	289,552
Interest-bearing	450,462	434,921
Savings and money market accounts	492,619	497,108
Time	423,124	348,427
Total deposits	1,678,802	1,570,008
Federal Home Loan Bank advances	75,000	125,000
Other liabilities	22,258	14,496
Total liabilities	1,776,060	1,709,504
Shareholders’ equity:
Series A convertible preferred stock, $1 par value; 5,000,000 shares authorized; 878,048 shares issued and outstanding at March 31, 2019 and December 31, 2018	878	878
Additional paid-in capital	210,673	211,789
Retained earnings	31,338	27,303
Accumulated other comprehensive loss, net of income tax	(904)	(3,316)
Total shareholders’ equity	259,751	254,379
Total liabilities and shareholders’ equity	2,035,811	1,963,883
Voting
Shareholders’ equity:
Common stock	17,633	17,592
Nonvoting
Shareholders’ equity:
Common stock	$ 133	$ 133

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities held to maturity, fair value	$ 3,806	$ 3,785
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	878,048	878,048
Preferred stock, shares outstanding	878,048	878,048
Voting
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	17,632,563	17,592,160
Common stock, shares outstanding	17,632,563	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
	Mar. 31, 2019	Mar. 31, 2018
Interest income:
Loans, including fees	$ 20,592	$ 12,234
Securities:
Taxable	1,346	880
Tax-exempt	377	280
Federal funds sold	19	20
Restricted equity securities	187	129
Interest-bearing deposits in financial institutions	446	201
Total interest income	22,967	13,744
Interest expense:
Interest-bearing deposits	1,594	754
Savings and money market accounts	1,718	1,005
Time deposits	1,813	649
Federal funds purchased	4	1
Securities sold under agreements to repurchase	5
Federal Home Loan Bank advances	831	489
Total interest expense	5,965	2,898
Net interest income	17,002	10,846
Provision for loan losses	886	678
Net interest income after provision for loan losses	16,116	10,168
Noninterest income:
Noninterest income	1,385	1,313
Net gain on sale of securities	12
Tri-Net fees	641	528
Other noninterest income	1,899	847
Total noninterest income	4,735	3,090
Noninterest expense:
Salaries and employee benefits	8,432	6,257
Data processing and software	1,474	798
Professional fees	543	474
Occupancy	883	521
Equipment	852	539
Regulatory fees	274	203
Merger related expenses	594
Amortization of intangibles	430	10
Other operating	1,243	778
Total noninterest expense	14,725	9,580
Income before income taxes	6,126	3,678
Income tax expense	1,346	483
Net income	$ 4,780	$ 3,195
Per share information:
Basic net income per share of common stock	$ 0.27	$ 0.27
Diluted net income per share of common stock	$ 0.25	$ 0.25
Weighted average shares outstanding:
Basic	17,783,239	11,664,245
Diluted	18,830,933	12,975,759
Treasury Management And Other Deposit Service Charges
Noninterest income:
Noninterest income	$ 798	$ 402
Mortgage Banking Income
Noninterest income:
Noninterest income	$ 1,385	$ 1,313

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4,780	$ 3,195
Unrealized gains (losses) on securities available-for-sale:
Unrealized holding gains (losses) arising during the period	3,264	(4,354)
Reclassification adjustment for gains included in net income	(12)
Tax effect	(850)	1,138
Net of tax	2,402	(3,216)
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	(241)	424
Reclassification adjustment for losses included in net income	197	250
Tax effect	54	(134)
Net of tax	10	540
Other comprehensive income (loss)	2,412	(2,666)
Comprehensive income	$ 7,192	$ 529

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 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, net of withholdings to satisfy employee tax obligations	300		$ 62		238
Exercise of employee common stock options, net of withholdings to satisfy employee tax obligations, shares			61,822
Exercise of common stock warrants	942		$ 104		838
Exercise of common stock warrants, shares			104,781
Net income	3,195					3,195
Other comprehensive loss	(2,666)						(2,666)
Ending balance at Mar. 31, 2018	148,693	878	$ 11,641	$ 133	119,147	22,087	(5,193)
Ending balance, shares at Mar. 31, 2018			11,640,797	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, net of withholdings to satisfy employee tax obligations	1,180		$ 182		998
Exercise of employee common stock options, net of withholdings to satisfy employee tax obligations, shares			182,002
Repurchase of commonstock	(2,431)		$ (155)		(2,276)
Repurchase of common, shares			(155,400)
Common and preferred stockdividends declared ($0.04per share)	(745)					(745)
Net income	4,780					4,780
Other comprehensive 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

Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 4,780,000	$ 3,195,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	886,000	678,000
Accretion of discounts on acquired loans and deferred fees	(559,000)	(171,000)
Depreciation and amortization	737,000	104,000
Net amortization of premiums on investment securities	205,000	289,000
Securities (gains) losses, net	(12,000)
Mortgage banking income	$ (1,385,000)	$ (1,313,000)
Type of Revenue [Extensible List]	us-gaap:MortgageBankingMember	us-gaap:MortgageBankingMember
Tri-Net fees	$ (641,000)	$ (528,000)
Stock-based compensation	344,000	305,000
Deferred income tax expense	395,000	255,000
Origination of loans held for sale	(130,697,000)	(123,853,000)
Proceeds from loans held for sale	117,471,000	137,501,000
Net increase in accrued interest receivable and other assets	(13,438,000)	(691,000)
Net increase (decrease) in accrued interest payable and other liabilities	7,718,000	(444,000)
Net cash provided by (used in) operating activities	(14,196,000)	15,327,000
Activities in securities available-for-sale:
Purchases	(2,138,000)	(8,639,000)
Sales	9,722,000	2,014,000
Maturities, prepayments and calls	5,599,000	5,044,000
Purchase of restricted equity securities	(2,107,000)	(3,000)
Net increase in loans	(37,523,000)	(83,949,000)
Purchase of premises and equipment	(1,109,000)	(66,000)
Net cash used in investing activities	(27,556,000)	(85,599,000)
Cash flows from financing activities:
Net increase in deposits	108,794,000	7,687,000
Proceeds from Federal Home Loan Bank advances	65,000,000	30,000,000
Payments on Federal Home Loan Bank advances	(115,000,000)
Repurchase of common stock	(2,431,000)
Exercise of common stock options and warrants, net of repurchase of restricted shares	1,012,000	913,000
Common and preferred stock dividends paid	(745,000)
Net cash provided by financing activities	56,630,000	38,600,000
Net increase (decrease) in cash and cash equivalents	14,878,000	(31,672,000)
Cash and cash equivalents at beginning of period	105,443,000	82,797,000
Cash and cash equivalents at end of period	120,321,000	51,125,000
Supplemental disclosures of cash paid:
Interest paid	6,034,000	2,888,000
Income taxes	356,000	264,000
Cash paid for operating lease liabilities	459,000	394,000
Supplemental disclosures of noncash transactions:
Transfer of loans to other real estate	50,000
Loans charged off to the allowance for loan losses	$ 82,000	$ 160,000

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 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 March 31, 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, deferred tax assets and estimated liabilities. There have been no significant changes to the Company’s critical accounting policies as disclosed in the Company’s Annual Report on Form 10-K for the year ended 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 March 31, 2019 through the date of the issued financial statements.

Securities

3 Months Ended

Mar. 31, 2018

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 March 31, 2019 and December 31, 2018 are summarized as follows (in thousands):

	March 31, 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	$	10,785	$	—	$	(184	)	$	10,601	$	11,053	$	—	$	(347	)	$	10,706
State and municipal securities		62,267		1,436		(303	)		63,400		62,142		765		(981	)		61,926
Mortgage-backed securities		138,851		1,080		(1,798	)		138,133		146,547		776		(3,165	)		144,158
Asset-backed securities		9,912		—		(164	)		9,748		15,437		4		(157	)		15,284
Other debt securities		11,858		51		(100	)		11,809		11,863		71		(200	)		11,734
Total	$	233,673	$	2,567	$	(2,549	)	$	233,691	$	247,042	$	1,616	$	(4,850	)	$	243,808
Securities held-to-maturity:
State and municipal securities	$	3,727	$	79	$	—		$	3,806	$	3,734	$	54	$	(3	)	$	3,785
Total	$	3,727	$	79	$	—		$	3,806	$	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 March 31, 2019 and December 31, 2018, and the length of time they were in continuous loss positions as of such dates are as follows (in thousands):

	Less than 12 months					12 months or more					Total
March 31, 2019	Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses
U. S. government agency securities	$	—	$	—		$	10,601	$	(184	)	$	10,601	$	(184	)
State and municipal securities		—		—			15,888		(303	)		15,888		(303	)
Mortgage-backed securities		2,931		(12	)		85,318		(1,786	)		88,249		(1,798	)
Asset-backed securities		9,748		(164	)		—		—			9,748		(164	)
Other debt securities		985		(15	)		5,472		(85	)		6,457		(100	)
Total temporarily impaired securities	$	13,664	$	(191	)	$	117,279	$	(2,358	)	$	130,943	$	(2,549	)
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 March 31, 2019, the Company had unrealized losses of $2.5 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.

Because the Company currently does not intend to sell any investment securities that have an unrealized loss at March 31, 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 March 31, 2019.

Securities with a carrying value of $168.4 million at March 31, 2019 were pledged to collateralize public deposits, derivative positions and Federal Home Loan Bank advances.

Results from sales of securities were as follows (in thousands):

	Three Months Ended			Three Months Ended
	March 31, 2019			March 31, 2018
Proceeds	$	9,722		$	2,014
Gross gains		70			70
Gross losses		(58	)		(70	)

The amortized cost and fair value of securities at March 31, 2019, by contractual maturity, are shown below (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	$	6,096	$	6,145	$	395	$	395
Due one to five years		31,435		31,836		3,332		3,411
Due five to ten years		40,627		41,260		—		—
Due beyond ten years		6,752		6,569		—		—
Mortgage-backed securities		138,851		138,133		—		—
Asset-backed securities		9,912		9,748		—		—
	$	233,673	$	233,691	$	3,727	$	3,806

Loans and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Loans and Allowance for Loan and Lease Losses

NOTE 3 – LOANS AND ALLOWANCE FOR LOAN LOSSES

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

	March 31, 2019			December 31, 2018
Commercial real estate	$	574,001		$	550,446
Consumer real estate		248,943			253,562
Construction and land development		162,237			174,670
Commercial and industrial		419,941			404,600
Consumer		26,241			25,615
Other		36,423			20,901
Total		1,467,786			1,429,794
Allowance for loan losses		(12,959	)		(12,113	)
	$	1,454,827		$	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 homogenous 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 (in thousands):

	Non-impaired Loans
March 31, 2019	Pass		Special Mention		Substandard		Total Non-impaired		Total Impaired Loans		Total
Commercial real estate	$	571,234	$	173	$	1,223	$	572,630	$	1,371	$	574,001
Consumer real estate		244,890		1,753		1,347		247,990		953		248,943
Construction and land development		162,160		51		18		162,229		8		162,237
Commercial and industrial		402,650		8,537		7,298		418,485		1,456		419,941
Consumer		26,183		1		10		26,194		47		26,241
Other		36,423		—		—		36,423		—		36,423
Total	$	1,443,540	$	10,515	$	9,896	$	1,463,951	$	3,835	$	1,467,786
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 March 31, 2019 or December 31, 2018.

The following table details the changes in the ALL for the three months ended March 31, 2019 and 2018 (in thousands):

	Commercial real estate		Consumer real estate			Construction and land development			Commercial and industrial			Consumer			Other			Total
Three Months Ended March 31, 2019
Balance, beginning of year	$	3,309	$	1,005		$	2,431		$	5,036		$	105		$	227		$	12,113
Charged-off loans		—		—			—			—			(37	)		(45	)		(82	)
Recoveries		6		3			—			2			18			13			42
Provision for loan losses		199		9			(65	)		486			53			204			886
Balance, end of period	$	3,514	$	1,017		$	2,366		$	5,524		$	139		$	399		$	12,959

Three Months Ended March 31, 2018
Balance, beginning of year	$	3,324	$	1,063		$	1,628		$	7,209		$	91		$	406		$	13,721
Charged-off loans		—		—			—			(147	)		(13	)		—			(160	)
Recoveries		5		1			—			272			46			—			324
Provision for loan losses		183		(28	)		114			464			(2	)		(53	)		678
Balance, end of period	$	3,512	$	1,036		$	1,742		$	7,798		$	122		$	353		$	14,563

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

	Commercial real estate		Consumer real estate		Construction and land development		Commercial and industrial		Consumer		Other		Total
March 31, 2019
Allowance for Loan Losses:
Collectively evaluated for impairment	$	3,514	$	1,017	$	2,366	$	5,333	$	139	$	399	$	12,768
Individually evaluated for impairment		—		—		—		191		—		—		191
Acquired with deteriorated credit quality		—		—		—		—		—		—		—
Balances, end of period	$	3,514	$	1,017	$	2,366	$	5,524	$	139	$	399	$	12,959
Loans:
Collectively evaluated for impairment	$	572,630	$	247,990	$	162,229	$	418,485	$	26,194	$	36,423	$	1,463,951
Individually evaluated for impairment		1,260		213		—		745		10		—		2,228
Acquired with deteriorated credit quality		111		740		8		711		37		—		1,607
Balances, end of period	$	574,001	$	248,943	$	162,237	$	419,941	$	26,241	$	36,423	$	1,467,786

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 March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019					December 31, 2018
	Amount		Percent of total loans, net of deferred fees			Amount		Percent of total loans, net of deferred fees
Commercial real estate	$	3,514		0.24	%	$	3,309		0.23	%
Consumer real estate		1,017		0.07			1,005		0.07
Construction and land development		2,366		0.16			2,431		0.17
Commercial and industrial		5,524		0.38			5,036		0.35
Consumer		139		0.01			105		0.01
Other		399		0.03			227		0.02
Total allowance for loan and lease losses	$	12,959		0.88	%	$	12,113		0.85	%

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


	March 31, 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	$	1,371	$	1,751	$	—	$	1,391	$	1,775	$	—
Consumer real estate		953		1,466		—		922		1,204		—
Construction and land development		8		25		—		8		18		—
Commercial and industrial		714		1,489		—		1,546		6,350		—
Consumer		47		77		—		31		56		—
Other		—		—		—		—		—		—
Subtotal		3,093		4,808		—		3,898		9,403		—
With an allowance recorded:
Commercial real estate		—		—		—		—		—		—
Consumer real estate		—		—		—		—		—		—
Construction and land development		—		—		—		—		—		—
Commercial and industrial		742		5,419		191		—		—		—
Consumer		—		—		—		—		—		—
Other		—		—		—		—		—		—
Subtotal		742		5,419		191		—		—		—
Total	$	3,835	$	10,227	$	191	$	3,898	$	9,403	$	—

The following presents information related to the average recorded investment and interest income recognized on impaired loans for the three months ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended				Three Months Ended
	March 31, 2019				March 31, 2018
	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
With no related allowance recorded:
Commercial real estate	$	1,381	$	16	$	1,197	$	10
Consumer real estate		938		—		—		—
Construction and land development		8		—		—		—
Commercial and industrial		724		—		1,470		—
Consumer		39		—		—		—
Other		—		—		—		—
Subtotal		3,090		16		2,667		10
With an allowance recorded:
Commercial real estate		—		—		—		—
Consumer real estate		—		—		—		—
Construction and land development		—		—		—		—
Commercial and industrial		777		—		—		—
Consumer		—		—		—		—
Other		—		—		—		—
Subtotal		777		—		—		—
Total	$	3,867	$	16	$	2,667	$	10

Interest income recognized on a cash basis for impaired loans amounted to $10,000 for the three months ended March 31, 2018. No interest income was recognized on a cash basis for impaired loans during the three months ended March 31, 2019.

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

	30 - 59		60 - 89		Greater Than
	Days		Days		89 Days		Total		Loans Not
March 31, 2019	Past Due		Past Due		Past Due		Past Due		Past Due		Total
Commercial real estate	$	—	$	5,709	$	—	$	5,709	$	568,292	$	574,001
Consumer real estate		367		38		417		822		248,121		248,943
Construction and land development		—		—		—		—		162,237		162,237
Commercial and industrial		291		753		—		1,044		418,897		419,941
Consumer		17		6		36		59		26,182		26,241
Other		—		—		—		—		36,423		36,423
Total	$	675	$	6,506	$	453	$	7,634	$	1,460,152	$	1,467,786
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 and accruing and troubled debt restructurings (“TDR”) by class of loans as of March 31, 2019 and December 31, 2018 (in thousands):

			Past Due Over 89		Troubled Debt
	Non-Accrual		Days and Accruing		Restructurings
March 31, 2019
Commercial real estate	$	—	$	—	$	1,255
Consumer real estate		912		—		—
Construction and land development		8		—		—
Commercial and industrial		744		—		—
Consumer		48		—		—
Other		—		—		—
Total	$	1,712	$	—	$	1,255

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 March 31, 2019 and December 31, 2018, all loans classified as nonperforming were deemed to be impaired.

As of March 31, 2019 and December 31, 2018, the Company had a recorded investment in TDR of $1.3 million and $1.4 million, respectively. The Company had no specific allowance for those loans at March 31, 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 TDR identified during the three months ended March 31, 2019 or 2018. There were no TDR for which there was a payment default within twelve months following the modification during the three months ended March 31, 2019 or 2018.

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

- 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

3 Months Ended

Mar. 31, 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 March 31, 2019, the Company had lease liabilities totaling $13.2 million and right-of-use assets totaling $12.5 million related to these leases. Lease liabilities and right-of-use assets are reflected in other liabilities and other assets, respectively. For the three months ended March 31, 2019, the weighted average remaining lease term for operating leases was 11.3 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
	March 31, 2019
Operating lease cost	$	482
Short-term lease cost		—
Variable least cost		—
Total lease cost	$	482

Rent expense for the three months ended March 31, 2018, prior to the adoption of ASU 2016-02 was $394,000.

There were no sale and leaseback transactions, leveraged leases, or lease transactions with related parties during the three months ended March 31, 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):

	March 31, 2019
Lease payments due:
Within one year	$	1,537
After one but within two years		1,546
After two but within three years		1,548
After three but within four years		1,447
After four but within five years		1,313
After five years		8,545
Total undiscounted cash flows		15,936
Discount on cash flows		(2,778	)
Total lease liability	$	13,158

Federal Home Loan Bank Advances

3 Months Ended

Mar. 31, 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 $75.0 million and $125.0 million at March 31, 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):

	March 31, 2019					December 31, 2018
Year	Amount		Interest Rates			Amount		Interest Rates
2019	$	75,000		2.54	%	$	125,000		2.48	%
2020		—		—			—		—
2021		—		—			—		—
2022		—		—			—		—
2023		—		—			—		—
Thereafter		—		—			—		—
Total	$	75,000		2.54	%	$	125,000		2.48	%

Advances from the FHLB are collateralized by investment securities with a market value of $4.0 million, FHLB stock and certain commercial and residential real estate mortgage loans totaling $700.0 million under a blanket mortgage collateral agreement. At March 31, 2019, the amount of available credit from the FHLB totaled $188.6 million.

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 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 periods ended March 31, 2019 and 2018 (in thousands):

				Unrealized Gains			Unrealized
	Gains and			and Losses			Losses on
	Losses on			on Available			Securities
	Cash Flow			for Sale			Transferred to
Three Months Ended March 31, 2019	Hedges			Securities			Held to Maturity			Total
Beginning Balance	$	(2,636	)	$	(680	)	$	—		$	(3,316	)
Other comprehensive income (loss) before reclassification		198			2,393			—			2,591
Amounts reclassified from accumulated other comprehensive income (loss)		(188	)		9			—			(179	)
Net current period other comprehensive income (loss)		10			2,402			—			2,412
Ending Balance	$	(2,626	)	$	1,722		$	—		$	(904	)

Three Months Ended March 31, 2018
Beginning Balance	$	(3,679	)	$	1,162		$	(10	)	$	(2,527	)
Other comprehensive income (loss) before reclassification		768			(3,216	)		20			(2,428	)
Amounts reclassified from accumulated other comprehensive income (loss)		(228	)		—			(10	)		(238	)
Net current period other comprehensive income (loss)		540			(3,216	)		10			(2,666	)
Ending Balance	$	(3,139	)	$	(2,054	)	$	—		$	(5,193	)

The following were significant amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three months ended March 31, 2019 and 2018 (in thousands):

	Three Months			Three Months			Affected Line Item
Details about Accumulated Other	Ended			Ended			in the Statement Where
Comprehensive Income (Loss) Components	March 31, 2019			March 31, 2018			Net Income is Presented

Unrealized losses on cash flow hedges	$	(110	)	$	(108	)	Interest expense - money market
		(87	)		(144	)	Interest expense - Federal Home Loan Bank advances
		9			24		Income tax benefit
	$	(188	)	$	(228	)	Net of tax

Unrealized gains and (losses) on available-for-sale securities	$	12		$	—		Net gain on sale of securities
		(3	)		—		Income tax expense
	$	9		$	—		Net of tax

Unrealized losses on securities transferred to held-to-maturity	$	—		$	(14	)	Interest income - securities
		—			4		Income tax benefit
	$	—		$	(10	)	Net of tax

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 7 – INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2019 was 22.0% compared to 13.1% for the three months ended March 31, 2018. In March 2016, the FASB issued guidance to simplify several aspects of the accounting for share-based payment award transactions, including income tax consequences. In addition to other changes, the guidance changed the accounting for excess tax benefits and tax deficiencies from generally being recognized in additional paid-in capital to recognition as income tax expense or benefit in the period they occur. The Company adopted the new guidance in the first quarter of 2017. As a result, the Company’s income tax expense was reduced by $33,000 and $363,000 for the periods ended March 31, 2019 and 2018.

The effective tax rate compared favorably to the statutory federal rate of 21% and Tennessee excise tax rate of 6.5% primarily due to investments in qualified municipal securities, company owned life insurance, state tax credits, net of the effect of certain non-deductible expenses and the recognition of excess tax benefits related to stock compensation.

Commitments and Contingencies

3 Months Ended

Mar. 31, 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 March 31, 2019 and December 31, 2018 (in thousands):

	Contract or notional amount
	March 31, 2019		December 31, 2018
Financial instruments whose contract amounts represent credit risk:
Unused commitments to extend credit	$	696,426	$	707,675
Standby letters of credit		12,069		12,273
Total	$	708,495	$	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 March 31, 2019, will not have a material impact on the financial statements of the Company.

Derivatives

3 Months Ended

Mar. 31, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivatives

NOTE 9 – DERIVATIVES

The Company utilizes interest rate swap agreements as part of its asset liability management strategy to help manage its interest rate risk position. 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

Forward starting interest rate swaps with notional amounts totaling $20 million as of March 31, 2019 and 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 has been included in net income. Therefore, the aggregate fair value of the swaps is recorded in other assets (liabilities) with changes in fair value recorded in other comprehensive income (loss). The amount included in accumulated other comprehensive income (loss) would be reclassified to current earnings should the hedges no longer be considered effective. The Company expects the hedges to remain fully effective during the remaining terms of the swaps.

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

	March 31, 2019			December 31, 2018
Notional amounts	$	20,000		$	20,000
Weighted average pay rates		3.54	%		3.54	%
Weighted average receive rates	3 month LIBOR			3 month LIBOR
Weighted average maturity	4.2 years			4.5 years
Fair value	$	(1,042	)	$	(836	)
Amount of unrealized loss recognized in accumulated other comprehensive income, net of tax	$	(770	)	$	(617	)

Pursuant to its interest rate swap agreements, the Company pledged collateral to the counterparties in the form of investment securities with a carrying value of $2.0 million at March 31, 2019. There was no collateral posted from the counterparties to the Company as of March 31, 2019. It is possible that the Company may need to post additional collateral in the future or that the counterparties may be required to post collateral to the Company in the future.

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 (in thousands):

	March 31, 2019					December 31, 2018
	Notional		Estimated			Notional		Estimated
	amount		fair value			amount		fair value
Interest rate swap agreements:
Pay fixed/receive variable swaps	$	28,359	$	(250	)	$	29,126	$	24
Pay variable/receive fixed swaps		28,359		250			29,126		(24	)
Total	$	56,718	$	—		$	58,252	$	—

Stock Options and Restricted Shares

3 Months Ended

Mar. 31, 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. Stock incentives include both restricted share and stock option grants. During 2018, the board of directors approved the addition of 400,000 shares of stock for issuance of stock incentives under the Plan. Total shares issuable under the plan were 399,184 at March 31, 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 (in thousands):

	Three Months Ended
	March 31,
	2019			2018
Stock-based compensation expense before income taxes	$	344		$	305
Less: deferred tax benefit		(90	)		(80	)
Reduction of net income	$	254		$	225

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 three months ended March 31, 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		(50,401	)		14.92
Forfeited		(6,467	)		16.97
Nonvested at end of period		130,931		$	17.55

As of March 31, 2019, there was $2.0 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 2.2 years. The total fair value of shares vested during the three months ended March 31, 2019 and 2018 was $0.8 million and $1.5 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 three 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 . There were no options granted in 2019 or 2018.

A summary of the activity in stock options for the three months ended March 31, 2019 follows:

						Weighted
				Weighted		Average
				Average		Remaining
				Exercise		Contractual
	Shares			Price		Term (years)
Outstanding at beginning of period		507,903		$	8.66
Granted		—			—
Exercised		(182,002	)		6.48
Forfeited or expired		—			—
Outstanding at end of period		325,901		$	9.88		4.2
Fully vested and expected to vest		325,305		$	9.88		4.2
Exercisable at end of period		319,651		$	9.82		4.1

Information related to stock options during each year follows:

	2019		2018
Intrinsic value of options exercised	$	1,733,087	$	897,541
Cash received from option exercises		1,179,923		949,500
Tax benefit realized from option exercises		15,411		234,617
Weighted average fair value of options granted		—		—

As of March 31, 2019, there was $0.01 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 0.9 years.

Regulatory Capital Requirements

3 Months Ended

Mar. 31, 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 March 31, 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 March 31, 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 March 31, 2019:
Total capital to risk-weighted assets:
CapStar Financial Holdings, Inc.	$	226,159		12.64	%	$	143,152		8.00	%	N/A		N/A
CapStar Bank		207,479		11.60			143,091		8.00		$	178,864		10.00
Tier I capital to risk-weighted assets:
CapStar Financial Holdings, Inc.		213,021		11.90			107,364		6.00		N/A		N/A
CapStar Bank		194,341		10.87			107,318		6.00			143,091		8.00
Common equity Tier 1 capital to risk weighted assets:
CapStar Financial Holdings, Inc.		204,021		11.40			80,523		4.50		N/A		N/A
CapStar Bank		177,841		9.94			80,489		4.50			116,261		6.50
Tier I capital to average assets:
CapStar Financial Holdings, Inc.		213,021		10.97			77,671		4.00		N/A		N/A
CapStar Bank		194,341		10.01			77,642		4.00			97,053		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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

Earnings Per Share

3 Months Ended

Mar. 31, 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 months ended March 31, 2019 and 2018 (in thousands except share data):

	Three Months Ended
	March 31,
	2019		2018
Basic net income per share calculation:
Numerator – Net income	$	4,780	$	3,195
Denominator – Average common shares outstanding		17,783,239		11,664,245
Basic net income per share	$	0.27	$	0.27
Diluted net income per share calculation:
Numerator – Net income	$	4,780	$	3,195
Denominator – Average common shares outstanding		17,783,239		11,664,245
Dilutive shares contingently issuable		1,047,694		1,311,514
Average diluted common shares outstanding		18,830,933		12,975,759
Diluted net income per share	$	0.25	$	0.25

Fair Value

3 Months Ended

Mar. 31, 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.

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.

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. The Company had no impaired loans carried at fair value at December 31, 2018.

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 at March 31, 2019 or December 31, 2018.

Loans Held For Sale: Loans held for sale are carried at the lower of cost or fair value, which is evaluated on a pool-level basis. The fair value of loans held for sale 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 March 31, 2019 or December 31, 2018.

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

	Fair value measurements at March 31, 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	$	10,601		$	—	$	10,601		$	—
Obligations of states and political subdivisions		63,400			—		63,400			—
Mortgage-backed securities-residential		138,133			—		138,133			—
Asset-backed securities		9,748			—		9,748			—
Other debt securities		11,809			—		11,809			—
Total securities available-for-sale	$	233,691		$	—	$	233,691		$	—
Derivatives:
Interest rate swaps - customer related	$	464		$	—	$	464		$	—
Liabilities:
Derivatives:
Interest rate swaps - customer related	$	(464	)	$	—	$	(464	)	$	—
Interest rate swaps - cash flow hedges		(1,042	)		—		(1,042	)		—
Total derivatives	$	(1,506	)	$	—	$	(1,506	)	$	—

	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
Total securities available-for-sale	$	243,808		$	—	$	243,808		$	—
Derivatives:
Interest rate swaps - customer related	$	494		$	—	$	494		$	—
Liabilities:
Derivatives:
Interest rate swaps - customer related	$	(494	)	$	—	$	(494	)	$	—
Interest rate swaps - cash flow hedges		(836	)		—		(836	)		—
Total derivatives	$	(1,330	)	$	—	$	(1,330	)	$	—

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

Fair value measurements at March 31, 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

551

—

551

The following table presents quantitative information about Level 3 fair value measurements for assets measured at fair value on a non-recurring basis at March 31, 2019 (dollars in thousands):

Range

Fair

Valuation

(Weighted-

March 31, 2019

Value

Technique(s)

Unobservable Input(s)

Average)

Impaired loans:

Commercial and industrial

551

Sales comparison approach

Appraisal discounts

Fair Value of Financial Instruments

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

	March 31, 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	$	112,196	$	112,196	$	94,681	$	94,681	Level 1
Federal funds sold		8,125		8,125		10,762		10,762	Level 1
Securities available-for-sale		233,691		233,691		243,808		243,808	Level 2
Securities held-to-maturity		3,727		3,806		3,734		3,785	Level 2
Loans held for sale		72,870		74,193		57,618		58,596	Level 2
Restricted equity securities		14,145	N/A			12,038	N/A		N/A
Loans		1,467,786		1,466,147		1,429,794		1,442,082	Level 3
Accrued interest receivable		6,446		6,446		5,964		5,964	Level 2
Other assets		34,664		34,664		34,489		34,489	Level 2
Financial liabilities:
Deposits		1,678,802		1,612,455		1,570,008		1,504,101	Level 3
Federal Home Loan Bank advances		75,000		75,663		125,000		126,548	Level 2
Other liabilities		1,506		1,506		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 No. 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, certain interest rate swap agreements and the cash flow hedge relationships. The fair values of interest rate swap agreements and the cash flow hedge relationships 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, certain interest rate swap agreements and the cash flow hedge relationships. The fair values of interest rate swap agreements and the cash flow hedge relationships 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)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements as of and for the period ended March 31, 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	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, deferred tax assets and estimated liabilities. There have been no significant changes to the Company’s critical accounting policies as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.
Subsequent Events	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 March 31, 2019 through the date of the issued financial statements.

Securities (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2019 and December 31, 2018 are summarized as follows (in thousands):

	March 31, 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	$	10,785	$	—	$	(184	)	$	10,601	$	11,053	$	—	$	(347	)	$	10,706
State and municipal securities		62,267		1,436		(303	)		63,400		62,142		765		(981	)		61,926
Mortgage-backed securities		138,851		1,080		(1,798	)		138,133		146,547		776		(3,165	)		144,158
Asset-backed securities		9,912		—		(164	)		9,748		15,437		4		(157	)		15,284
Other debt securities		11,858		51		(100	)		11,809		11,863		71		(200	)		11,734
Total	$	233,673	$	2,567	$	(2,549	)	$	233,691	$	247,042	$	1,616	$	(4,850	)	$	243,808
Securities held-to-maturity:
State and municipal securities	$	3,727	$	79	$	—		$	3,806	$	3,734	$	54	$	(3	)	$	3,785
Total	$	3,727	$	79	$	—		$	3,806	$	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
March 31, 2019	Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses			Estimated fair value		Gross unrealized losses
U. S. government agency securities	$	—	$	—		$	10,601	$	(184	)	$	10,601	$	(184	)
State and municipal securities		—		—			15,888		(303	)		15,888		(303	)
Mortgage-backed securities		2,931		(12	)		85,318		(1,786	)		88,249		(1,798	)
Asset-backed securities		9,748		(164	)		—		—			9,748		(164	)
Other debt securities		985		(15	)		5,472		(85	)		6,457		(100	)
Total temporarily impaired securities	$	13,664	$	(191	)	$	117,279	$	(2,358	)	$	130,943	$	(2,549	)
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 Securities

Results from sales of securities were as follows (in thousands):

	Three Months Ended			Three Months Ended
	March 31, 2019			March 31, 2018
Proceeds	$	9,722		$	2,014
Gross gains		70			70
Gross losses		(58	)		(70	)

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	$	6,096	$	6,145	$	395	$	395
Due one to five years		31,435		31,836		3,332		3,411
Due five to ten years		40,627		41,260		—		—
Due beyond ten years		6,752		6,569		—		—
Mortgage-backed securities		138,851		138,133		—		—
Asset-backed securities		9,912		9,748		—		—
	$	233,673	$	233,691	$	3,727	$	3,806

Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Summary of Loan Portfolio

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

	March 31, 2019			December 31, 2018
Commercial real estate	$	574,001		$	550,446
Consumer real estate		248,943			253,562
Construction and land development		162,237			174,670
Commercial and industrial		419,941			404,600
Consumer		26,241			25,615
Other		36,423			20,901
Total		1,467,786			1,429,794
Allowance for loan losses		(12,959	)		(12,113	)
	$	1,454,827		$	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 (in thousands):

	Non-impaired Loans
March 31, 2019	Pass		Special Mention		Substandard		Total Non-impaired		Total Impaired Loans		Total
Commercial real estate	$	571,234	$	173	$	1,223	$	572,630	$	1,371	$	574,001
Consumer real estate		244,890		1,753		1,347		247,990		953		248,943
Construction and land development		162,160		51		18		162,229		8		162,237
Commercial and industrial		402,650		8,537		7,298		418,485		1,456		419,941
Consumer		26,183		1		10		26,194		47		26,241
Other		36,423		—		—		36,423		—		36,423
Total	$	1,443,540	$	10,515	$	9,896	$	1,463,951	$	3,835	$	1,467,786
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 table details the changes in the ALL for the three months ended March 31, 2019 and 2018 (in thousands):

	Commercial real estate		Consumer real estate			Construction and land development			Commercial and industrial			Consumer			Other			Total
Three Months Ended March 31, 2019
Balance, beginning of year	$	3,309	$	1,005		$	2,431		$	5,036		$	105		$	227		$	12,113
Charged-off loans		—		—			—			—			(37	)		(45	)		(82	)
Recoveries		6		3			—			2			18			13			42
Provision for loan losses		199		9			(65	)		486			53			204			886
Balance, end of period	$	3,514	$	1,017		$	2,366		$	5,524		$	139		$	399		$	12,959

Three Months Ended March 31, 2018
Balance, beginning of year	$	3,324	$	1,063		$	1,628		$	7,209		$	91		$	406		$	13,721
Charged-off loans		—		—			—			(147	)		(13	)		—			(160	)
Recoveries		5		1			—			272			46			—			324
Provision for loan losses		183		(28	)		114			464			(2	)		(53	)		678
Balance, end of period	$	3,512	$	1,036		$	1,742		$	7,798		$	122		$	353		$	14,563

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

	Commercial real estate		Consumer real estate		Construction and land development		Commercial and industrial		Consumer		Other		Total
March 31, 2019
Allowance for Loan Losses:
Collectively evaluated for impairment	$	3,514	$	1,017	$	2,366	$	5,333	$	139	$	399	$	12,768
Individually evaluated for impairment		—		—		—		191		—		—		191
Acquired with deteriorated credit quality		—		—		—		—		—		—		—
Balances, end of period	$	3,514	$	1,017	$	2,366	$	5,524	$	139	$	399	$	12,959
Loans:
Collectively evaluated for impairment	$	572,630	$	247,990	$	162,229	$	418,485	$	26,194	$	36,423	$	1,463,951
Individually evaluated for impairment		1,260		213		—		745		10		—		2,228
Acquired with deteriorated credit quality		111		740		8		711		37		—		1,607
Balances, end of period	$	574,001	$	248,943	$	162,237	$	419,941	$	26,241	$	36,423	$	1,467,786

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

	March 31, 2019					December 31, 2018
	Amount		Percent of total loans, net of deferred fees			Amount		Percent of total loans, net of deferred fees
Commercial real estate	$	3,514		0.24	%	$	3,309		0.23	%
Consumer real estate		1,017		0.07			1,005		0.07
Construction and land development		2,366		0.16			2,431		0.17
Commercial and industrial		5,524		0.38			5,036		0.35
Consumer		139		0.01			105		0.01
Other		399		0.03			227		0.02
Total allowance for loan and lease losses	$	12,959		0.88	%	$	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 March 31, 2019 and December 31, 2018 (in thousands):


	March 31, 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	$	1,371	$	1,751	$	—	$	1,391	$	1,775	$	—
Consumer real estate		953		1,466		—		922		1,204		—
Construction and land development		8		25		—		8		18		—
Commercial and industrial		714		1,489		—		1,546		6,350		—
Consumer		47		77		—		31		56		—
Other		—		—		—		—		—		—
Subtotal		3,093		4,808		—		3,898		9,403		—
With an allowance recorded:
Commercial real estate		—		—		—		—		—		—
Consumer real estate		—		—		—		—		—		—
Construction and land development		—		—		—		—		—		—
Commercial and industrial		742		5,419		191		—		—		—
Consumer		—		—		—		—		—		—
Other		—		—		—		—		—		—
Subtotal		742		5,419		191		—		—		—
Total	$	3,835	$	10,227	$	191	$	3,898	$	9,403	$	—

The following presents information related to the average recorded investment and interest income recognized on impaired loans for the three months ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended				Three Months Ended
	March 31, 2019				March 31, 2018
	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
With no related allowance recorded:
Commercial real estate	$	1,381	$	16	$	1,197	$	10
Consumer real estate		938		—		—		—
Construction and land development		8		—		—		—
Commercial and industrial		724		—		1,470		—
Consumer		39		—		—		—
Other		—		—		—		—
Subtotal		3,090		16		2,667		10
With an allowance recorded:
Commercial real estate		—		—		—		—
Consumer real estate		—		—		—		—
Construction and land development		—		—		—		—
Commercial and industrial		777		—		—		—
Consumer		—		—		—		—
Other		—		—		—		—
Subtotal		777		—		—		—
Total	$	3,867	$	16	$	2,667	$	10

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 March 31, 2019 and December 31, 2018 by class of loans (in thousands):

	30 - 59		60 - 89		Greater Than
	Days		Days		89 Days		Total		Loans Not
March 31, 2019	Past Due		Past Due		Past Due		Past Due		Past Due		Total
Commercial real estate	$	—	$	5,709	$	—	$	5,709	$	568,292	$	574,001
Consumer real estate		367		38		417		822		248,121		248,943
Construction and land development		—		—		—		—		162,237		162,237
Commercial and industrial		291		753		—		1,044		418,897		419,941
Consumer		17		6		36		59		26,182		26,241
Other		—		—		—		—		36,423		36,423
Total	$	675	$	6,506	$	453	$	7,634	$	1,460,152	$	1,467,786
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 90 Days and Accruing and Troubled Debt Restructurings

			Past Due Over 89		Troubled Debt
	Non-Accrual		Days and Accruing		Restructurings
March 31, 2019
Commercial real estate	$	—	$	—	$	1,255
Consumer real estate		912		—		—
Construction and land development		8		—		—
Commercial and industrial		744		—		—
Consumer		48		—		—
Other		—		—		—
Total	$	1,712	$	—	$	1,255

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
	March 31, 2019
Balance at beginning of period	$	1,620
Change due to payments received and accretion		(13	)
Change due to loan charge-offs		—
Other		—
Balance at end of period	$	1,607

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

	Three Months Ended
	March 31, 2019
Balance at beginning of period	$	440
Accretion		(13	)
Reclassification from (to) nonaccretable difference		—
Other, net		11
Balance at end of period	$	438

Premises and Equipment (Tables)

3 Months Ended

Mar. 31, 2019

Property Plant And Equipment [Abstract]

Summary of Lease Costs

Lease costs were as follows (in thousands):

	Three Months Ended
	March 31, 2019
Operating lease cost	$	482
Short-term lease cost		—
Variable least cost		—
Total lease cost	$	482

Premises and Equipment - Maturity Analysis of Operating Lease Liabilities and Reconciliation of Undiscounted Cash Flows (Tables)

3 Months Ended

Mar. 31, 2019

Property Plant And Equipment [Abstract]

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):

	March 31, 2019
Lease payments due:
Within one year	$	1,537
After one but within two years		1,546
After two but within three years		1,548
After three but within four years		1,447
After four but within five years		1,313
After five years		8,545
Total undiscounted cash flows		15,936
Discount on cash flows		(2,778	)
Total lease liability	$	13,158

Federal Home Loan Bank Advances (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2019					December 31, 2018
Year	Amount		Interest Rates			Amount		Interest Rates
2019	$	75,000		2.54	%	$	125,000		2.48	%
2020		—		—			—		—
2021		—		—			—		—
2022		—		—			—		—
2023		—		—			—		—
Thereafter		—		—			—		—
Total	$	75,000		2.54	%	$	125,000		2.48	%

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 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 periods ended March 31, 2019 and 2018 (in thousands):

				Unrealized Gains			Unrealized
	Gains and			and Losses			Losses on
	Losses on			on Available			Securities
	Cash Flow			for Sale			Transferred to
Three Months Ended March 31, 2019	Hedges			Securities			Held to Maturity			Total
Beginning Balance	$	(2,636	)	$	(680	)	$	—		$	(3,316	)
Other comprehensive income (loss) before reclassification		198			2,393			—			2,591
Amounts reclassified from accumulated other comprehensive income (loss)		(188	)		9			—			(179	)
Net current period other comprehensive income (loss)		10			2,402			—			2,412
Ending Balance	$	(2,626	)	$	1,722		$	—		$	(904	)

Three Months Ended March 31, 2018
Beginning Balance	$	(3,679	)	$	1,162		$	(10	)	$	(2,527	)
Other comprehensive income (loss) before reclassification		768			(3,216	)		20			(2,428	)
Amounts reclassified from accumulated other comprehensive income (loss)		(228	)		—			(10	)		(238	)
Net current period other comprehensive income (loss)		540			(3,216	)		10			(2,666	)
Ending Balance	$	(3,139	)	$	(2,054	)	$	—		$	(5,193	)

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

The following were significant amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three months ended March 31, 2019 and 2018 (in thousands):

	Three Months			Three Months			Affected Line Item
Details about Accumulated Other	Ended			Ended			in the Statement Where
Comprehensive Income (Loss) Components	March 31, 2019			March 31, 2018			Net Income is Presented

Unrealized losses on cash flow hedges	$	(110	)	$	(108	)	Interest expense - money market
		(87	)		(144	)	Interest expense - Federal Home Loan Bank advances
		9			24		Income tax benefit
	$	(188	)	$	(228	)	Net of tax

Unrealized gains and (losses) on available-for-sale securities	$	12		$	—		Net gain on sale of securities
		(3	)		—		Income tax expense
	$	9		$	—		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)

3 Months Ended

Mar. 31, 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 March 31, 2019 and December 31, 2018 (in thousands):

	Contract or notional amount
	March 31, 2019		December 31, 2018
Financial instruments whose contract amounts represent credit risk:
Unused commitments to extend credit	$	696,426	$	707,675
Standby letters of credit		12,069		12,273
Total	$	708,495	$	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)

3 Months Ended

Mar. 31, 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):

	March 31, 2019			December 31, 2018
Notional amounts	$	20,000		$	20,000
Weighted average pay rates		3.54	%		3.54	%
Weighted average receive rates	3 month LIBOR			3 month LIBOR
Weighted average maturity	4.2 years			4.5 years
Fair value	$	(1,042	)	$	(836	)
Amount of unrealized loss recognized in accumulated other comprehensive income, net of tax	$	(770	)	$	(617	)

Summary of Customer Related Interest Rate Swaps

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

	March 31, 2019					December 31, 2018
	Notional		Estimated			Notional		Estimated
	amount		fair value			amount		fair value
Interest rate swap agreements:
Pay fixed/receive variable swaps	$	28,359	$	(250	)	$	29,126	$	24
Pay variable/receive fixed swaps		28,359		250			29,126		(24	)
Total	$	56,718	$	—		$	58,252	$	—

Stock Options and Restricted Shares (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Company Recognized Stock-Based Compensation Expense

	Three Months Ended
	March 31,
	2019			2018
Stock-based compensation expense before income taxes	$	344		$	305
Less: deferred tax benefit		(90	)		(80	)
Reduction of net income	$	254		$	225

Summary of Changes in Company's Nonvested Restricted Shares

A summary of the changes in the Company’s nonvested restricted shares for the three months ended March 31, 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		(50,401	)		14.92
Forfeited		(6,467	)		16.97
Nonvested at end of period		130,931		$	17.55

Summary of Activity in Stock Options

A summary of the activity in stock options for the three months ended March 31, 2019 follows:

						Weighted
				Weighted		Average
				Average		Remaining
				Exercise		Contractual
	Shares			Price		Term (years)
Outstanding at beginning of period		507,903		$	8.66
Granted		—			—
Exercised		(182,002	)		6.48
Forfeited or expired		—			—
Outstanding at end of period		325,901		$	9.88		4.2
Fully vested and expected to vest		325,305		$	9.88		4.2
Exercisable at end of period		319,651		$	9.82		4.1

Information Related to Stock Options

Information related to stock options during each year follows:

	2019		2018
Intrinsic value of options exercised	$	1,733,087	$	897,541
Cash received from option exercises		1,179,923		949,500
Tax benefit realized from option exercises		15,411		234,617
Weighted average fair value of options granted		—		—

Regulatory Capital Requirements (Tables)

3 Months Ended

Mar. 31, 2019

Banking And Thrift [Abstract]

Schedule of Capital Amounts and Ratios

The Company’s and the Bank’s capital amounts and ratios as of March 31, 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 March 31, 2019:
Total capital to risk-weighted assets:
CapStar Financial Holdings, Inc.	$	226,159		12.64	%	$	143,152		8.00	%	N/A		N/A
CapStar Bank		207,479		11.60			143,091		8.00		$	178,864		10.00
Tier I capital to risk-weighted assets:
CapStar Financial Holdings, Inc.		213,021		11.90			107,364		6.00		N/A		N/A
CapStar Bank		194,341		10.87			107,318		6.00			143,091		8.00
Common equity Tier 1 capital to risk weighted assets:
CapStar Financial Holdings, Inc.		204,021		11.40			80,523		4.50		N/A		N/A
CapStar Bank		177,841		9.94			80,489		4.50			116,261		6.50
Tier I capital to average assets:
CapStar Financial Holdings, Inc.		213,021		10.97			77,671		4.00		N/A		N/A
CapStar Bank		194,341		10.01			77,642		4.00			97,053		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)

3 Months Ended

Mar. 31, 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 months ended March 31, 2019 and 2018 (in thousands except share data):

	Three Months Ended
	March 31,
	2019		2018
Basic net income per share calculation:
Numerator – Net income	$	4,780	$	3,195
Denominator – Average common shares outstanding		17,783,239		11,664,245
Basic net income per share	$	0.27	$	0.27
Diluted net income per share calculation:
Numerator – Net income	$	4,780	$	3,195
Denominator – Average common shares outstanding		17,783,239		11,664,245
Dilutive shares contingently issuable		1,047,694		1,311,514
Average diluted common shares outstanding		18,830,933		12,975,759
Diluted net income per share	$	0.25	$	0.25

Fair Value (Tables)

3 Months Ended

Mar. 31, 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 (in thousands):

	Fair value measurements at March 31, 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	$	10,601		$	—	$	10,601		$	—
Obligations of states and political subdivisions		63,400			—		63,400			—
Mortgage-backed securities-residential		138,133			—		138,133			—
Asset-backed securities		9,748			—		9,748			—
Other debt securities		11,809			—		11,809			—
Total securities available-for-sale	$	233,691		$	—	$	233,691		$	—
Derivatives:
Interest rate swaps - customer related	$	464		$	—	$	464		$	—
Liabilities:
Derivatives:
Interest rate swaps - customer related	$	(464	)	$	—	$	(464	)	$	—
Interest rate swaps - cash flow hedges		(1,042	)		—		(1,042	)		—
Total derivatives	$	(1,506	)	$	—	$	(1,506	)	$	—

	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
Total securities available-for-sale	$	243,808		$	—	$	243,808		$	—
Derivatives:
Interest rate swaps - customer related	$	494		$	—	$	494		$	—
Liabilities:
Derivatives:
Interest rate swaps - customer related	$	(494	)	$	—	$	(494	)	$	—
Interest rate swaps - cash flow hedges		(836	)		—		(836	)		—
Total derivatives	$	(1,330	)	$	—	$	(1,330	)	$	—

Summary of Assets Measured at Fair Value on a Nonrecurring Basis

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

Fair value measurements at March 31, 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

551

—

551

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

The following table presents quantitative information about Level 3 fair value measurements for assets measured at fair value on a non-recurring basis at March 31, 2019 (dollars in thousands):

Range

Fair

Valuation

(Weighted-

March 31, 2019

Value

Technique(s)

Unobservable Input(s)

Average)

Impaired loans:

Commercial and industrial

551

Sales comparison approach

Appraisal discounts

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 March 31, 2019 and December 31, 2018 were as follows (in thousands):

	March 31, 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	$	112,196	$	112,196	$	94,681	$	94,681	Level 1
Federal funds sold		8,125		8,125		10,762		10,762	Level 1
Securities available-for-sale		233,691		233,691		243,808		243,808	Level 2
Securities held-to-maturity		3,727		3,806		3,734		3,785	Level 2
Loans held for sale		72,870		74,193		57,618		58,596	Level 2
Restricted equity securities		14,145	N/A			12,038	N/A		N/A
Loans		1,467,786		1,466,147		1,429,794		1,442,082	Level 3
Accrued interest receivable		6,446		6,446		5,964		5,964	Level 2
Other assets		34,664		34,664		34,489		34,489	Level 2
Financial liabilities:
Deposits		1,678,802		1,612,455		1,570,008		1,504,101	Level 3
Federal Home Loan Bank advances		75,000		75,663		125,000		126,548	Level 2
Other liabilities		1,506		1,506		2,753		2,753	Level 3

Securities - Summary of Fair Value of Available for Sale Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities available for sale [Abstract]
Amortized Cost	$ 233,673	$ 247,042
Gross unrealized gains	2,567	1,616
Gross unrealized (losses)	(2,549)	(4,850)
Estimated fair value	233,691	243,808
Securities held to maturity [Abstract]
Amortized Cost	3,727	3,734
Gross unrealized gains	79	54
Gross unrealized (losses)		(3)
Estimated fair value	3,806	3,785
U. S. government agency securities
Securities available for sale [Abstract]
Amortized Cost	10,785	11,053
Gross unrealized (losses)	(184)	(347)
Estimated fair value	10,601	10,706
State and municipal securities
Securities available for sale [Abstract]
Amortized Cost	62,267	62,142
Gross unrealized gains	1,436	765
Gross unrealized (losses)	(303)	(981)
Estimated fair value	63,400	61,926
Securities held to maturity [Abstract]
Amortized Cost	3,727	3,734
Gross unrealized gains	79	54
Gross unrealized (losses)		(3)
Estimated fair value	3,806	3,785
Mortgage-backed securities
Securities available for sale [Abstract]
Amortized Cost	138,851	146,547
Gross unrealized gains	1,080	776
Gross unrealized (losses)	(1,798)	(3,165)
Estimated fair value	138,133	144,158
Asset-backed securities
Securities available for sale [Abstract]
Amortized Cost	9,912	15,437
Gross unrealized gains		4
Gross unrealized (losses)	(164)	(157)
Estimated fair value	9,748	15,284
Other debt securities
Securities available for sale [Abstract]
Amortized Cost	11,858	11,863
Gross unrealized gains	51	71
Gross unrealized (losses)	(100)	(200)
Estimated fair value	$ 11,809	$ 11,734

Securities - Summary of Securities with Unrealized Losses and Length of Time Continuous Loss Positions (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	$ 13,664	$ 34,154
Less than 12 months, Gross unrealized (losses)	(191)	(574)
12 months or more, Estimated fair value	117,279	117,753
12 months or more, Gross unrealized losses	(2,358)	(4,279)
Total, Estimated fair value	130,943	151,907
Total, Gross unrealized losses	(2,549)	(4,853)
U. S. government agency securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
12 months or more, Estimated fair value	10,601	10,706
12 months or more, Gross unrealized losses	(184)	(347)
Total, Estimated fair value	10,601	10,706
Total, Gross unrealized losses	(184)	(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	15,888	17,376
12 months or more, Gross unrealized losses	(303)	(772)
Total, Estimated fair value	15,888	30,831
Total, Gross unrealized losses	(303)	(984)
Mortgage-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	2,931	7,075
Less than 12 months, Gross unrealized (losses)	(12)	(17)
12 months or more, Estimated fair value	85,318	87,232
12 months or more, Gross unrealized losses	(1,786)	(3,148)
Total, Estimated fair value	88,249	94,307
Total, Gross unrealized losses	(1,798)	(3,165)
Asset-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Less than 12 months, Estimated fair value	9,748	8,262
Less than 12 months, Gross unrealized (losses)	(164)	(145)
12 months or more, Estimated fair value		2,439
12 months or more, Gross unrealized losses		(12)
Total, Estimated fair value	9,748	10,701
Total, Gross unrealized losses	(164)	(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	5,472
12 months or more, Gross unrealized losses	(85)
Total, Estimated fair value	6,457	5,362
Total, Gross unrealized losses	$ (100)	$ (200)

Securities - Additional Information (Details) $ in Millions	Mar. 31, 2019 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Unrealized losses in investment securities portfolio	$ 2.5
Public Deposits, Derivative Positions and Federal Home Loan Bank Advances
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities	$ 168.4

Securities - Summary of Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Proceeds	$ 9,722	$ 2,014
Gross gains	70	70
Gross losses	$ (58)	$ (70)

Securities - Summary of Amortized Cost and Fair Value of Debt and Equity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale, Amortized cost [Abstract]
Due in less than one year	$ 6,096
Due one to five years	31,435
Due five to ten years	40,627
Due beyond ten years	6,752
Amortized Cost	233,673	$ 247,042
Available-for-sale, Estimated fair value [Abstract]
Due in less than one year	6,145
Due one to five years	31,836
Due five to ten years	41,260
Due beyond ten years	6,569
Estimated fair value	233,691	243,808
Held-to-maturity, Amortized cost [Abstract]
Due in less than one year	395
Due one to five years	3,332
Amortized Cost	3,727	3,734
Securities held to maturity [Abstract]
Due in less than one year	395
Due one to five years	3,411
Estimated fair value	3,806	3,785
Mortgage-backed securities
Available-for-sale, Amortized cost [Abstract]
Amortized cost	138,851
Amortized Cost	138,851	146,547
Available-for-sale, Estimated fair value [Abstract]
Estimated fair value	138,133
Estimated fair value	138,133	144,158
Asset-backed securities
Available-for-sale, Amortized cost [Abstract]
Amortized cost	9,912
Amortized Cost	9,912	15,437
Available-for-sale, Estimated fair value [Abstract]
Estimated fair value	9,748
Estimated fair value	$ 9,748	$ 15,284

Loans and Allowance for Loan Losses - Summary of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]
Total loans	$ 1,467,786	$ 1,429,794
Allowance for loan losses	(12,959)	(12,113)	$ (14,563)	$ (13,721)
Loans, net	1,454,827	1,417,681
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Total loans	574,001	550,446
Allowance for loan losses	(3,514)	(3,309)	(3,512)	(3,324)
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Total loans	248,943	253,562
Allowance for loan losses	(1,017)	(1,005)	(1,036)	(1,063)
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Total loans	162,237	174,670
Allowance for loan losses	(2,366)	(2,431)	(1,742)	(1,628)
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Total loans	419,941	404,600
Allowance for loan losses	(5,524)	(5,036)	(7,798)	(7,209)
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Total loans	26,241	25,615
Allowance for loan losses	(139)	(105)	(122)	(91)
Other
Loans And Leases Receivable Disclosure [Line Items]
Total loans	36,423	20,901
Allowance for loan losses	$ (399)	$ (227)	$ (353)	$ (406)

Loans and Allowance for Loan Losses - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Contract	Mar. 31, 2018 USD ($) Contract	Dec. 31, 2018 USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Minimum loan amount for loans analyzed by credit risk		$ 500,000
Total loans	$ 1,467,786,000		$ 1,429,794,000
Interest income recognized on a cash basis for impaired loans	0	$ 10,000
Investment in TDR	1,300,000		1,400,000
Specific allowance related to loans	191,000
Additional commitments related to TDR	$ 0		0
New TDR identified during the period \| Contract	0	0
TDR, payment default within twelve months \| Contract	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
Doubtful
Loans And Leases Receivable Disclosure [Line Items]
Total loans	$ 0		$ 0

Loans and Allowance for Loan Losses - Summary of Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 12,113	$ 13,721
Charged-off loans	(82)	(160)
Recoveries	42	324
Provision for loan losses	886	678
Ending Balance	12,959	14,563
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,309	3,324
Recoveries	6	5
Provision for loan losses	199	183
Ending Balance	3,514	3,512
Consumer real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,005	1,063
Recoveries	3	1
Provision for loan losses	9	(28)
Ending Balance	1,017	1,036
Construction and land development
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	2,431	1,628
Provision for loan losses	(65)	114
Ending Balance	2,366	1,742
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	5,036	7,209
Charged-off loans		(147)
Recoveries	2	272
Provision for loan losses	486	464
Ending Balance	5,524	7,798
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	105	91
Charged-off loans	(37)	(13)
Recoveries	18	46
Provision for loan losses	53	(2)
Ending Balance	139	122
Other
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	227	406
Charged-off loans	(45)
Recoveries	13
Provision for loan losses	204	(53)
Ending Balance	$ 399	$ 353

Loans and Allowance for Loan Losses - Summary of Breakdown of Allowance for Loan Losses and Loan Portfolio by Loan Category (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses:
Collectively evaluated for impairment	$ 12,768	$ 12,113
Individually evaluated for impairment	191	0
Allowance for Loan Losses, Ending Balance	12,959	12,113	$ 14,563	$ 13,721
Loans:
Collectively evaluated for impairment	1,463,951	1,425,896
Individually evaluated for impairment	2,228	2,278
Acquired with deteriorated credit quality	1,607	1,620
Total	1,467,786	1,429,794
Commercial real estate
Allowance for Loan Losses:
Collectively evaluated for impairment	3,514	3,309
Individually evaluated for impairment		0
Allowance for Loan Losses, Ending Balance	3,514	3,309	3,512	3,324
Loans:
Collectively evaluated for impairment	572,630	549,055
Individually evaluated for impairment	1,260	1,278
Acquired with deteriorated credit quality	111	113
Total	574,001	550,446
Consumer real estate
Allowance for Loan Losses:
Collectively evaluated for impairment	1,017	1,005
Individually evaluated for impairment		0
Allowance for Loan Losses, Ending Balance	1,017	1,005	1,036	1,063
Loans:
Collectively evaluated for impairment	247,990	252,640
Individually evaluated for impairment	213	183
Acquired with deteriorated credit quality	740	739
Total	248,943	253,562
Construction and land development
Allowance for Loan Losses:
Collectively evaluated for impairment	2,366	2,431
Individually evaluated for impairment		0
Allowance for Loan Losses, Ending Balance	2,366	2,431	1,742	1,628
Loans:
Collectively evaluated for impairment	162,229	174,662
Acquired with deteriorated credit quality	8	8
Total	162,237	174,670
Commercial and industrial
Allowance for Loan Losses:
Collectively evaluated for impairment	5,333	5,036
Individually evaluated for impairment	191	0
Allowance for Loan Losses, Ending Balance	5,524	5,036	7,798	7,209
Loans:
Collectively evaluated for impairment	418,485	403,054
Individually evaluated for impairment	745	817
Acquired with deteriorated credit quality	711	729
Total	419,941	404,600
Consumer
Allowance for Loan Losses:
Collectively evaluated for impairment	139	105
Individually evaluated for impairment		0
Allowance for Loan Losses, Ending Balance	139	105	122	91
Loans:
Collectively evaluated for impairment	26,194	25,584
Individually evaluated for impairment	10
Acquired with deteriorated credit quality	37	31
Total	26,241	25,615
Other
Allowance for Loan Losses:
Collectively evaluated for impairment	399	227
Individually evaluated for impairment		0
Allowance for Loan Losses, Ending Balance	399	227	$ 353	$ 406
Loans:
Collectively evaluated for impairment	36,423	20,901
Total	$ 36,423	$ 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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 12,959	$ 12,113	$ 14,563	$ 13,721
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.88%	0.85%
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 3,514	$ 3,309	3,512	3,324
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.24%	0.23%
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 1,017	$ 1,005	1,036	1,063
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.07%	0.07%
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 2,366	$ 2,431	1,742	1,628
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.16%	0.17%
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 5,524	$ 5,036	7,798	7,209
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.38%	0.35%
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 139	$ 105	122	91
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.01%	0.01%
Other
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses, Amount	$ 399	$ 227	$ 353	$ 406
Allowance for loan and lease losses, Percentage of total loans, net of deferred fees	0.03%	0.02%

Loans and Allowance for Loan Losses - Summary of Impaired Loans Evaluated for Specific Loss Allowance (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	$ 3,093	$ 3,898
Impaired loans with no related allowance recorded, Unpaid principal balance	4,808	9,403
Impaired loans with an allowance recorded, Related allowance	191
Impaired loans with an allowance recorded, Recorded investment	742
Impaired loans with an allowance recorded, Unpaid principal balance	5,419
Recorded investment	3,835	3,898
Unpaid principal balance	10,227	9,403
Commercial real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,371	1,391
Impaired loans with no related allowance recorded, Unpaid principal balance	1,751	1,775
Consumer real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	953	922
Impaired loans with no related allowance recorded, Unpaid principal balance	1,466	1,204
Construction and land development
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	8	8
Impaired loans with no related allowance recorded, Unpaid principal balance	25	18
Commercial and industrial
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	714	1,546
Impaired loans with no related allowance recorded, Unpaid principal balance	1,489	6,350
Impaired loans with an allowance recorded, Related allowance	191
Impaired loans with an allowance recorded, Recorded investment	742
Impaired loans with an allowance recorded, Unpaid principal balance	5,419
Consumer
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	47	31
Impaired loans with no related allowance recorded, Unpaid principal balance	$ 77	$ 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
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	$ 3,090	$ 2,667
Impaired loans with no related allowance recorded, Interest income recognized	16	10
Impaired loans with an allowance recorded, Average recorded investment	777
Average recorded investment	3,867	2,667
Interest income recognized	16	10
Commercial real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	1,381	1,197
Impaired loans with no related allowance recorded, Interest income recognized	16	10
Consumer real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	938
Construction and land development
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	8
Commercial and industrial
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	724	$ 1,470
Impaired loans with an allowance recorded, Average recorded investment	777
Consumer
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	$ 39

Loans and Allowance for Loan Losses - Schedule of Aging of Recorded Investment in Past-due Loans, by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 7,634	$ 1,595
Loans Not Past Due	1,460,152	1,428,199
Total	1,467,786	1,429,794
Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	5,709	527
Loans Not Past Due	568,292	549,919
Total	574,001	550,446
Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	822	919
Loans Not Past Due	248,121	252,643
Total	248,943	253,562
Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	162,237	174,670
Total	162,237	174,670
Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,044	54
Loans Not Past Due	418,897	404,546
Total	419,941	404,600
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	59	95
Loans Not Past Due	26,182	25,520
Total	26,241	25,615
Other
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	36,423	20,901
Total	36,423	20,901
30 - 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	675	475
30 - 59 Days Past Due [Member] \| Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		300
30 - 59 Days Past Due [Member] \| Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	367	69
30 - 59 Days Past Due [Member] \| Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	291	54
30 - 59 Days Past Due [Member] \| Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	17	52
60 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	6,506	302
60 - 89 Days Past Due [Member] \| Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	5,709	227
60 - 89 Days Past Due [Member] \| Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	38	75
60 - 89 Days Past Due [Member] \| Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	753
60 - 89 Days Past Due [Member] \| Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	6
Greater than 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	453	818
Greater than 89 Days Past Due [Member] \| Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	417	775
Greater than 89 Days Past Due [Member] \| Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 36	$ 43

Loans and Allowance for Loan Losses - Schedule of Non-Accrual Loans, Past Due Loans over 89 Days and Accruing and Troubled Debt Restructurings (TDR) by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	$ 1,712	$ 2,078
Allowance for loan and lease losses, Amount	12,959	12,113	$ 14,563	$ 13,721
Troubled Debt Restructurings	1,255	1,391
Past Due Over 89 Days and Accruing		214
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses, Amount	3,514	3,309	3,512	3,324
Troubled Debt Restructurings	1,255	1,391
Consumer real estate
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	912	1,187
Allowance for loan and lease losses, Amount	1,017	1,005	1,036	1,063
Past Due Over 89 Days and Accruing		214
Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	8	19
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	744	817
Allowance for loan and lease losses, Amount	5,524	5,036	7,798	7,209
Consumer
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	48	55
Allowance for loan and lease losses, Amount	$ 139	$ 105	$ 122	$ 91

Loans and Allowance for Loan Losses - Schedule of activity in purchased credit impaired loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule [Line Items]
Balance, beginning , carrying value	$ 1,620
Change due to payments received and accretion	(13)
Balance, ending, carrying value	1,607
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	440
Other	11
Balance, ending, carrying value	438
Accretion	$ (13)

Premises and Equipment - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property Plant And Equipment [Abstract]
Operating lease, liability	$ 13,158,000
Operating lease, right-of-use asset	$ 12,500,000
Operating lease, weighted average remaining lease term	11 years 3 months 18 days
Operating lease, weighted average discount rate, percent	3.53%
Operating leases, rent expense		$ 394,000,000
Sale and leaseback transaction	$ 0	$ 0

Premises and Equipment - Summary of Lease Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Property Plant And Equipment [Abstract]
Operating lease cost	$ 482
Total lease cost	$ 482

Premises and Equipment - Maturity Analysis of Operating Lease Liabilities and Reconciliation of Undiscounted Cash Flows (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lease payments due:
Within one year	$ 1,537
After one but within two years	1,546
After two but within three years	1,548
After three but within four years	1,447
After four but within five years	1,313
After five years	8,545
Total undiscounted cash flows	15,936
Discount on cash flows	(2,778)
Operating lease, liability	$ 13,158

Federal Home Loan Bank Advances - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank Advances [Line Items]
Outstanding borrowings	$ 75,000	$ 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	4,000
Mortgage loans collateralized amount	700,000
Amount of available credit	$ 188,600

Federal Home Loan Bank Advances - Summary of Contractual Maturities and Average Effective Rates of Outstanding Advances (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank Advances Maturities Summary [Abstract]
2019	$ 75,000	$ 125,000
Total amount	$ 75,000	$ 125,000
2019	2.54%	2.48%
Total interest rates	2.54%	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
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 254,379	$ 146,946
Other comprehensive income (loss) before reclassification	2,591	(2,428)
Amounts reclassified from accumulated other comprehensive income (loss)	(179)	(238)
Other comprehensive income (loss)	2,412	(2,666)
Ending balance	259,751	148,693
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(2,636)	(3,679)
Other comprehensive income (loss) before reclassification	198	768
Amounts reclassified from accumulated other comprehensive income (loss)	(188)	(228)
Other comprehensive income (loss)	10	540
Ending balance	(2,626)	(3,139)
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(680)	1,162
Other comprehensive income (loss) before reclassification	2,393	(3,216)
Amounts reclassified from accumulated other comprehensive income (loss)	9
Other comprehensive income (loss)	2,402	(3,216)
Ending balance	1,722	(2,054)
Unrealized Losses on Securities Transferred to Held to Maturity
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(10)
Other comprehensive income (loss) before reclassification		20
Amounts reclassified from accumulated other comprehensive income (loss)		(10)
Other comprehensive income (loss)		10
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(3,316)	(2,527)
Other comprehensive income (loss)	2,412	(2,666)
Ending balance	$ (904)	$ (5,193)

Accumulated Other Comprehensive Income (Loss) - Summary of Significant Amounts Reclassified out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net (gain) loss on sale of securities	$ 12
Interest expense - Federal Home Loan Bank advances	(831)	$ (489)
Income tax benefit (expense)	(1,346)	(483)
Net income	4,780	3,195
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	(110)	(108)
Interest expense - Federal Home Loan Bank advances	(87)	(144)
Income tax benefit (expense)	9	24
Net income	(188)	(228)
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gains and (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	12
Income tax benefit (expense)	(3)
Net income	$ 9
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
	Mar. 31, 2019	Mar. 31, 2018
Income Taxes [Line Items]
Effective tax rate	22.00%	13.10%
Income tax expense	$ 33,000	$ 363,000
Federal statutory income tax rate	21.00%
Tennessee \| State and Local Jurisdiction
Income Taxes [Line Items]
Excise tax rate	6.50%

Commitments and Contingencies - Schedule of Financial Instruments Representing Credit Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Unused commitments to extend credit	$ 696,426	$ 707,675
Standby letters of credit	12,069	12,273
Total	$ 708,495	$ 719,948

Derivatives - Additional Information (Details) - Designated as Hedging Instrument - Interest Rate Swaps - Cash Flow Hedges - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional amounts	$ 20,000,000	$ 20,000,000
Investment securities pledged collateral to counterparties	2,000,000
Investment securities pledged collateral from counterparties	$ 0

Derivatives - Summary of Interest-Rate Swaps Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument - Cash Flow Hedges - Interest Rate Swaps - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional amounts	$ 20,000,000	$ 20,000,000
Weighted average pay rates	3.54%	3.54%
Weighted average receive rates	Mar. 31, 2019: 3 month LIBOR and Dec. 31, 2018: 3 month LIBOR
Weighted average maturity	4 years 2 months 12 days	4 years 6 months
Fair value	$ (1,042,000)	$ (836,000)
Amount of unrealized loss recognized in accumulated other comprehensive income, net of tax	$ (770,000)	$ (617,000)

Derivatives - Summary of Customer Related Interest Rate Swaps (Details) - Interest Rate Swaps - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Interest rate swap, Notional amount	$ 56,718,000	$ 58,252,000
Pay fixed/receive variable swaps
Derivative [Line Items]
Interest rate swap, Notional amount	28,359,000	29,126,000
Interest rate swap, Estimated fair value	(250,000)	24,000
Pay variable/receive fixed swaps
Derivative [Line Items]
Interest rate swap, Notional amount	28,359,000	29,126,000
Interest rate swap, Estimated fair value	$ 250,000	$ (24,000)

Stock Options and Restricted Shares - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost	$ 2,000
Total fair value of shares vested	$ 800	$ 1,500
Vesting period	3 years
Contractual term	10 years
Options granted	0	0
Unrecognized compensation cost		$ 10
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost expected to be recognized over a weighted-average period	2 years 2 months 12 days
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost expected to be recognized over a weighted-average period	10 months 25 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	399,184
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
	Mar. 31, 2019	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based compensation expense before income taxes	$ 344	$ 305
Less: deferred tax benefit	(90)	(80)
Reduction of net income	$ 254	$ 225

Stock Options and Restricted Shares - Summary of Changes in Company's Nonvested Restricted Shares (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Restricted Shares, Abstract
Restricted Shares, Nonvested Beginning Balance \| shares	157,616
Restricted Shares, Granted \| shares	30,183
Restricted Shares, Vested \| shares	(50,401)
Restricted Shares, Forfeited \| shares	(6,467)
Restricted Shares, Nonvested Ending Balance \| shares	130,931
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	14.92
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	16.97
Weighted Average Grant Date Fair Value, Nonvested Ending Balance \| $ / shares	$ 17.55

Stock Options and Restricted Shares - Summary of Activity in Stock Options (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Shares, Abstract
Shares Outstanding, Beginning Balance	507,903
Shares Outstanding, Granted	0	0
Shares Outstanding, Exercised	(182,002)
Shares Outstanding, Ending Balance	325,901
Shares, Fully Vested and Expected to Vest	325,305
Shares, Exercisable at End of Period	319,651
Weighted Average Exercise Price, Abstract
Weighted Average Exercise Price Outstanding, Beginning Balance	$ 8.66
Weighted Average Exercise Price Outstanding, Exercised	6.48
Weighted Average Exercise Price Outstanding, Ending Balance	9.88
Weighted Average Exercise Price, Fully vested and expected to vest	9.88
Weighted Average Exercise Price, Exercisable at End of Period	$ 9.82
Weighted Average Remaining Contractual Term (year), Abstract
Weighted Average Remaining Contractual Term Outstanding	4 years 2 months 12 days
Weighted Average Remaining Contractual Term, Fully Vested and Expected to Vest	4 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercisable at End of Period	4 years 1 month 6 days

Stock Options and Restricted Shares - Information Related to Stock Options (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Intrinsic value of options exercised	$ 1,733,087	$ 897,541
Cash received from option exercises	1,179,923	949,500
Tax benefit realized from option exercises	$ 15,411	$ 234,617

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

Mar. 31, 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

$ 226,159

$ 222,030

Tier I capital to risk-weighted assets, actual amount

213,021

209,738

Tier I capital to average assets, actual amount

$ 213,021

$ 209,738

Total capital to risk-weighted assets, actual ratio

12.64%

12.84%

Tier I capital to risk-weighted assets, actual ratio

11.90%

12.13%

Tier I capital to average assets, actual ratio

10.97%

11.06%

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

^[1]

$ 143,152

$ 138,336

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

^[1]

107,364

103,752

Tier I capital to average assets, minimum capital requirement amount

^[1]

$ 77,671

$ 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

$ 204,021

$ 200,738

Tier I capital to risk-weighted assets, actual ratio

11.40%

11.61%

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

^[1]

$ 80,523

$ 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

$ 207,479

$ 201,972

Tier I capital to risk-weighted assets, actual amount

194,341

189,680

Tier I capital to average assets, actual amount

$ 194,341

$ 189,680

Total capital to risk-weighted assets, actual ratio

11.60%

11.68%

Tier I capital to risk-weighted assets, actual ratio

10.87%

10.97%

Tier I capital to average assets, actual ratio

10.01%

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

^[1]

$ 143,091

$ 138,294

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

^[1]

107,318

103,721

Tier I capital to average assets, minimum capital requirement amount

^[1]

$ 77,642

$ 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]

$ 178,864

$ 172,868

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

^[2]

143,091

138,294

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

^[2]

$ 97,053

$ 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

$ 177,841

$ 173,180

Tier I capital to risk-weighted assets, actual ratio

9.94%

10.02%

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

^[1]

$ 80,489

$ 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]

$ 116,261

$ 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
	Mar. 31, 2019	Mar. 31, 2018
Basic net income per share calculation:
Numerator – Net income	$ 4,780	$ 3,195
Denominator – Average common shares outstanding	17,783,239	11,664,245
Basic net income per share of common stock	$ 0.27	$ 0.27
Diluted net income per share calculation:
Numerator – Net income	$ 4,780	$ 3,195
Denominator – Average common shares outstanding	17,783,239	11,664,245
Dilutive shares contingently issuable	1,047,694	1,311,514
Average diluted common shares outstanding	18,830,933	12,975,759
Diluted net income per share of common stock	$ 0.25	$ 0.25

- 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.

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+ Details

Fair Value - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Securities available-for-sale, at fair value	$ 233,691	$ 243,808
Obligations of States and Political Subdivisions
Assets:
Securities available-for-sale, at fair value	63,400	61,926
Asset-backed securities
Assets:
Securities available-for-sale, at fair value	9,748	15,284
Other debt securities
Assets:
Securities available-for-sale, at fair value	11,809	11,734
Fair Value Measurements Recurring Basis
Assets:
Securities available-for-sale, at fair value	233,691	243,808
Liabilities:
Total derivatives	(1,506)	(1,330)
Fair Value Measurements Recurring Basis \| U.S. Government-sponsored Agencies
Assets:
Securities available-for-sale, at fair value	10,601	10,706
Fair Value Measurements Recurring Basis \| Obligations of States and Political Subdivisions
Assets:
Securities available-for-sale, at fair value	63,400	61,926
Fair Value Measurements Recurring Basis \| Mortgage-backed Securities-residential
Assets:
Securities available-for-sale, at fair value	138,133	144,158
Fair Value Measurements Recurring Basis \| Asset-backed securities
Assets:
Securities available-for-sale, at fair value	9,748	15,284
Fair Value Measurements Recurring Basis \| Other debt securities
Assets:
Securities available-for-sale, at fair value	11,809	11,734
Fair Value Measurements Recurring Basis \| Interest Rate Swaps - Customer Related
Assets:
Interest rate swaps - customer related	464	494
Liabilities:
Total derivatives	(464)	(494)
Interest rate swaps - customer related	464	494
Fair Value Measurements Recurring Basis \| Interest Rate Swaps - Cash Flow Hedges
Liabilities:
Total derivatives	(1,042)	(836)
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2)
Assets:
Securities available-for-sale, at fair value	233,691	243,808
Liabilities:
Total derivatives	(1,506)	(1,330)
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| U.S. Government-sponsored Agencies
Assets:
Securities available-for-sale, at fair value	10,601	10,706
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	63,400	61,926
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed Securities-residential
Assets:
Securities available-for-sale, at fair value	138,133	144,158
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Asset-backed securities
Assets:
Securities available-for-sale, at fair value	9,748	15,284
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Other debt securities
Assets:
Securities available-for-sale, at fair value	11,809	11,734
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Interest Rate Swaps - Customer Related
Assets:
Interest rate swaps - customer related	464	494
Liabilities:
Total derivatives	(464)	(494)
Interest rate swaps - customer related	464	494
Fair Value Measurements Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Interest Rate Swaps - Cash Flow Hedges
Liabilities:
Total derivatives	$ (1,042)	$ (836)

Fair Value - Summary of Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Commercial and industrial $ in Thousands	Mar. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	$ 551
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	0
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	$ 551

Fair Value - Summary of Quantitative Information About Level 3 Fair Value Measurements for Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Commercial and industrial - Fair Value, Measurements, Nonrecurring $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	$ 551
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Commercial and industrial	$ 551
Valuation Technique(s)	Sales comparison approach
Unobservable Input(s)	Appraisal discounts
Range	25.00%

Fair Value - Summary of Carrying Value and Fair Values of the Bank's Financial Instruments (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Financial assets:
Estimated fair value	$ 233,691,000	$ 243,808,000
Securities held to maturity, fair value	3,806,000	3,785,000
Loans held for sale	0	0
Carrying amount
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	112,196,000	94,681,000
Federal funds sold	8,125,000	10,762,000
Estimated fair value	233,691,000	243,808,000
Securities held to maturity, fair value	3,727,000	3,734,000
Loans held for sale	72,870,000	57,618,000
Restricted equity securities	14,145,000	12,038,000
Loans	1,467,786,000	1,429,794,000
Accrued interest receivable	6,446,000	5,964,000
Other assets	34,664,000	34,489,000
Financial liabilities:
Deposits	1,678,802,000	1,570,008,000
Federal Home Loan Bank advances	75,000,000	125,000,000
Other liabilities	1,506,000	2,753,000
Fair value
Financial assets:
Loans	1,466,147,000	1,442,082,000
Fair value \| Level 1
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	112,196,000	94,681,000
Federal funds sold	8,125,000	10,762,000
Fair value \| Level 2
Financial assets:
Estimated fair value	233,691,000	243,808,000
Securities held to maturity, fair value	3,806,000	3,785,000
Loans held for sale	74,193,000	58,596,000
Accrued interest receivable	6,446,000	5,964,000
Other assets	34,664,000	34,489,000
Financial liabilities:
Federal Home Loan Bank advances	75,663,000	126,548,000
Fair value \| Level 3 Fair Value Measurements
Financial liabilities:
Deposits	1,612,455,000	1,504,101,000
Other liabilities	$ 1,506,000	$ 2,753,000

Regulatory Capital Requirements - Schedule of Capital Amounts and Ratios (Parenthetical) (Details)	Mar. 31, 2019
Banking And Thrift [Abstract]
Minimum risk based capital ratios	2.50%

Fair Value - Additional Information (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Impaired loans marked to fair value		$ 0
Other real estate owned	$ 0	0
Loans held for sale carried at fair value	$ 0	$ 0