CapStar Financial (CSTR) 10-Q 4 Nov 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 02, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
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	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		22,166,963
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-37886
Entity Tax Identification Number	81-1527911
Entity Address, Address Line One	1201 Demonbreun Street
Entity Address, Address Line Two	Suite 700
Entity Address, City or Town	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37203
City Area Code	615
Local Phone Number	732-6400
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	TN
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, $1.00 par value per share
Trading Symbol	CSTR
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 51,929	$ 40,191
Interest-bearing deposits in financial institutions	287,438	237,248
Federal funds sold	19,900	0
Total cash and cash equivalents	359,267	277,439
Securities available-for-sale, at fair value	483,778	486,215
Securities held-to-maturity, fair value of $1,847 and $2,504 at September 30, 2021 and December 31, 2020, respectively	1,788	2,407
Loans held for sale, includes $79,842 and $97,303 measured at fair value at September 30, 2021 and December 31, 2020, respectively	176,488	186,998
Loans held for investment	1,894,249	1,883,690
Less allowance for loan losses	(22,533)	(23,245)
Loans, net	1,871,716	1,860,445
Premises and equipment, net	25,886	26,689
Restricted equity securities	14,443	15,562
Accrued interest receivable	7,606	8,771
Goodwill	41,068	41,068
Core deposit intangible, net	7,152	8,630
Other real estate owned, net	349	523
Other assets	122,586	72,259
Total assets	3,112,127	2,987,006
Deposits:
Noninterest-bearing	718,299	662,934
Interest-bearing	963,460	844,101
Savings and money market accounts	601,359	591,438
Time	391,274	469,528
Total deposits	2,674,392	2,568,001
Federal Home Loan Bank advances	0	10,000
Subordinated notes	29,499	29,423
Other liabilities	37,908	36,096
Total liabilities	2,741,799	2,643,520
Shareholders’ equity:
Additional paid-in capital	248,322	246,890
Retained earnings	99,341	66,879
Accumulated other comprehensive income, net of tax	499	7,728
Total shareholders’ equity	370,328	343,486
Total liabilities and shareholders’ equity	3,112,127	2,987,006
Voting
Shareholders’ equity:
Common stock	$ 22,166	$ 21,989

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities held to maturity, fair value	$ 1,847	$ 2,504
Loans held for sale carried at fair value	$ 79,842	$ 97,303
Voting
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	22,165,760	21,988,803
Common stock, shares outstanding	22,165,760	21,988,803

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Loans, including fees	$ 22,350	$ 22,796	$ 66,936	$ 61,620
Securities:
Taxable	1,655	1,193	4,900	3,465
Tax-exempt	344	343	1,065	975
Federal funds sold	9	0	12	0
Restricted equity securities	161	139	482	421
Interest-bearing deposits in financial institutions	171	171	405	640
Total interest income	24,690	24,642	73,800	67,121
Interest expense:
Interest-bearing deposits	390	640	1,216	3,371
Savings and money market accounts	288	2,537	896	4,819
Time deposits	654	1,299	2,317	4,197
Federal Home Loan Bank advances	0	116	12	348
Subordinated notes	394	394	1,181	394
Total interest expense	1,726	4,986	5,622	13,129
Net interest income	22,964	19,656	68,178	53,992
Provision for loan losses	0	2,119	(415)	11,295
Net interest income after provision for loan losses	22,964	17,537	68,593	42,697
Noninterest income:
Noninterest income			13,318	19,063
Tri-Net	1,939	668	4,618	2,528
Net gain (loss) on sale of securities	7	34	20	74
Other noninterest income	1,197	1,558	3,446	3,228
Total noninterest income	11,651	14,804	31,548	31,500
Noninterest expense:
Salaries and employee benefits	10,980	12,949	31,210	33,256
Data processing and software	2,632	2,353	8,530	6,317
Occupancy	1,028	999	3,193	2,615
Equipment	760	864	2,640	2,295
Professional services	469	638	1,634	1,854
Regulatory fees	279	397	746	893
Acquisition related expenses	0	2,548	323	3,286
Amortization of intangibles	477	539	1,478	1,300
Other operating	1,741	1,452	5,105	4,067
Total noninterest expense	18,366	22,739	54,859	55,883
Income before income taxes	16,249	9,602	45,282	18,314
Income tax expense	3,147	2,115	9,075	3,299
Net income	$ 13,102	$ 7,487	$ 36,207	$ 15,015
Per share information:
Basic net income per share of common stock	$ 0.59	$ 0.34	$ 1.64	$ 0.77
Diluted net income per share of common stock	$ 0.59	$ 0.34	$ 1.63	$ 0.77
Weighted average shares outstanding:
Basic	22,164,278	21,948,579	22,114,948	19,558,281
Diluted	22,218,402	21,960,490	22,165,130	19,583,448
SBA Lending
Noninterest income:
Noninterest income	$ 911	$ 476	$ 1,781	$ 525
Deposit Service Charges
Noninterest income:
Noninterest income	1,187	1,064	3,398	2,531
Mortgage Banking
Noninterest income:
Noninterest income	4,693	9,686	13,318	19,063
Wealth Management
Noninterest income:
Noninterest income	481	382	1,412	1,162
Interchange and Debit Card Transaction Fees
Noninterest income:
Noninterest income	$ 1,236	$ 936	$ 3,555	$ 2,389

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 13,102	$ 7,487	$ 36,207	$ 15,015
Unrealized gains (losses) on securities available-for-sale:
Unrealized gains (losses) arising during the period	(2,123)	(440)	(9,748)	3,902
Reclassification adjustment for (gains) included in net income	(7)	(34)	(20)	(74)
Tax effect	548	(40)	2,539	(1,086)
Net of tax	(1,582)	(514)	(7,229)	2,742
Unrealized losses on cash flow hedges:
Reclassification adjustment for losses included in net income	0	2,167	0	2,679
Net of tax	0	2,167	0	2,679
Other comprehensive income (loss)	(1,582)	1,653	(7,229)	5,421
Comprehensive income	$ 11,520	$ 9,140	$ 28,978	$ 20,436

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock, Voting	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2019	$ 273,046	$ 18,362	$ 207,083	$ 46,218	$ 1,383
Beginning balance, shares at Dec. 31, 2019		18,361,922
Net issuance (redemption) of restricted common stock	(123)	$ 73	(196)
Net issuance (redemption) of restricted common stock, shares		73,098
Stock-based compensation expense	360		360
Net exercise of common stock options	106	$ 21	85
Net exercise of common stock options, shares		20,582
Repurchase of common stock	(1,437)	$ (148)	(1,289)
Repurchase of common stock, shares		(147,800)
Common stock dividends declared	(916)			(916)
Net income	1,346			1,346
Other comprehensive income (loss)	3,408				3,408
Ending balance at Mar. 31, 2020	275,790	$ 18,308	206,043	46,648	4,791
Ending balance, shares at Mar. 31, 2020		18,307,802
Beginning balance at Dec. 31, 2019	273,046	$ 18,362	207,083	46,218	1,383
Beginning balance, shares at Dec. 31, 2019		18,361,922
Net income	15,015
Other comprehensive income (loss)	5,421				5,421
Ending balance at Sep. 30, 2020	333,895	$ 21,948	246,847	58,296	6,804
Ending balance, shares at Sep. 30, 2020		21,947,805
Beginning balance at Mar. 31, 2020	275,790	$ 18,308	206,043	46,648	4,791
Beginning balance, shares at Mar. 31, 2020		18,307,802
Net issuance (redemption) of restricted common stock	1	$ (6)	7
Net issuance (redemption) of restricted common stock, shares		(5,614)
Stock-based compensation expense	541		541
Common stock dividends declared	(923)			(923)
Net income	6,181			6,181
Other comprehensive income (loss)	360				360
Ending balance at Jun. 30, 2020	281,950	$ 18,302	206,591	51,906	5,151
Ending balance, shares at Jun. 30, 2020		18,302,188
Net issuance (redemption) of restricted common stock	(13)	$ 14	(27)
Net issuance (redemption) of restricted common stock, shares		13,899
Stock-based compensation expense	330		330
Issuance of common stock in conjunction with acquisitions, shares		3,631,718
Issuance of common stock in conjunction with acquisitions	43,585	$ 3,632	39,953
Common stock dividends declared	(1,097)			1,097
Net income	7,487			7,487
Other comprehensive income (loss)	1,653				1,653
Ending balance at Sep. 30, 2020	333,895	$ 21,948	246,847	58,296	6,804
Ending balance, shares at Sep. 30, 2020		21,947,805
Beginning balance at Dec. 31, 2020	343,486	$ 21,989	246,890	66,879	7,728
Beginning balance, shares at Dec. 31, 2020		21,988,803
Net issuance (redemption) of restricted common stock	(98)	$ 118	(216)
Net issuance (redemption) of restricted common stock, shares		117,962
Stock-based compensation expense	349		349
Net exercise of common stock options		$ 1	(1)
Net exercise of common stock options, shares		1,039
Repurchase of common stock	(462)	$ (27)	(435)
Repurchase of common stock, shares		(27,260)
Common stock dividends declared	(1,093)			1,093
Net income	11,030			11,030
Other comprehensive income (loss)	(9,425)				(9,425)
Ending balance at Mar. 31, 2021	343,787	$ 22,081	246,587	76,816	(1,697)
Ending balance, shares at Mar. 31, 2021		22,080,544
Beginning balance at Dec. 31, 2020	$ 343,486	$ 21,989	246,890	66,879	7,728
Beginning balance, shares at Dec. 31, 2020		21,988,803
Net exercise of common stock options, shares	96,344
Net income	$ 36,207
Other comprehensive income (loss)	(7,229)				(7,229)
Ending balance at Sep. 30, 2021	370,328	$ 22,166	248,322	99,341	499
Ending balance, shares at Sep. 30, 2021		22,165,760
Beginning balance at Mar. 31, 2021	343,787	$ 22,081	246,587	76,816	(1,697)
Beginning balance, shares at Mar. 31, 2021		22,080,544
Net issuance (redemption) of restricted common stock	(30)	$ (3)	(27)
Net issuance (redemption) of restricted common stock, shares		(2,926)
Stock-based compensation expense	447		447
Net exercise of common stock options	1,026	$ 88	938
Net exercise of common stock options, shares		87,929
Common stock dividends declared	(1,332)			1,332
Net income	12,076			12,076
Other comprehensive income (loss)	3,778				3,778
Ending balance at Jun. 30, 2021	359,752	$ 22,166	247,945	87,560	2,081
Ending balance, shares at Jun. 30, 2021		22,165,547
Net issuance (redemption) of restricted common stock	(48)	$ (6)	(42)
Net issuance (redemption) of restricted common stock, shares		(5,702)
Stock-based compensation expense	373		373
Net exercise of common stock options	52	$ 6	46
Net exercise of common stock options, shares		5,915
Common stock dividends declared	(1,321)			1,321
Net income	13,102			13,102
Other comprehensive income (loss)	(1,582)				(1,582)
Ending balance at Sep. 30, 2021	$ 370,328	$ 22,166	$ 248,322	$ 99,341	$ 499
Ending balance, shares at Sep. 30, 2021		22,165,760

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (Unaudited) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05	$ 0.05

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 36,207	$ 15,015
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	(415)	11,295
Accretion of discounts on acquired loans and deferred fees	(5,412)	(3,446)
Depreciation and amortization	2,615	2,261
Net amortization of premiums on investment securities	1,823	994
Net gain on sale of securities	(20)	(74)
Mortgage banking	$ (13,318)	$ (19,063)
Type Of Revenue Extensible List	Mortgage Banking	Mortgage Banking
Tri-Net	$ (4,618)	$ (2,528)
SBA lending	(1,781)	(525)
Net gain on disposal of premises and equipment	(21)	303
Net gain on sale of other real estate owned	(29)	(108)
Stock-based compensation	1,169	1,231
Deferred income tax expense	1,283	1,788
Origination of loans held for sale	(896,950)	(845,982)
Proceeds from loans held for sale	925,397	834,392
Cash payments arising from operating leases	(1,568)	(1,402)
Amortization of debt issuance expense	76	31
Net increase in accrued interest receivable and other assets	(15,373)	(6,406)
Net increase in accrued interest payable and other liabilities	1,812	4,186
Net cash provided by (used in) operating activities	30,877	(8,644)
Cash flows from investing activities:
Purchases	(83,420)	(134,935)
Sales	0	77,338
Maturities, prepayments and calls	74,305	64,009
Maturities, prepayments and calls	600	880
Net redemption of restricted equity securities	1,119	1,154
Net increase in loans	(5,685)	(185,614)
Purchase of premises and equipment	(278)	(417)
Proceeds from the sale of premises and equipment		2,660
Purchases of bank owned life insurance	(31,000)
Proceeds from sale of other real estate	2,225	1,665
Cash paid for acquisitions		(27,278)
Cash received from acquisitions		90,760
Net cash used in investing activities	(42,134)	(109,778)
Cash flows from financing activities:
Net increase in deposits	106,391	445,414
Proceeds from Federal Home Loan Bank advances		680,000
Payments on Federal Home Loan Bank advances	(10,000)	(680,000)
Issuance of subordinated debt		29,387
Repurchase of common stock	(462)	(1,437)
Exercise of common stock options and warrants, net of repurchase of restricted shares	902	(29)
Common stock dividends paid	(3,746)	(2,936)
Termination of interest rate swap agreements and related reclassification adjustment for unrealized losses included in income		(2,679)
Net cash provided by financing activities	93,085	473,078
Net increase in cash and cash equivalents	81,828	354,656
Cash and cash equivalents at beginning of period	277,439	101,269
Cash and cash equivalents at end of period	359,267	455,925
Supplemental disclosures of cash paid:
Interest paid	5,279	12,525
Income taxes paid	13,395	5,620
Supplemental disclosures of noncash transactions:
Transfer of loans to other real estate	2,022	113
Loans charged off to the allowance for loan losses	407	1,014
Lease liabilities arising from obtaining right-of-use assets		668
Unrealized (losses) gains on securities available for sale	$ (7,229)	2,742
Loans transferred from held for sale to held for investment		2,800
Assets acquired, net of cash		423,983
Liabilities assumed		447,412
Goodwill		$ 3,558

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 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 notes 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 2020 Form 10-K. Business Combinations The Company accounts for business combinations using the acquisition method of accounting. The accounts of an acquired entity are included as of the date of acquisition, and any excess of purchase price over the fair value of the net assets acquired is capitalized as goodwill. Under this method, all identifiable assets acquired, including purchased loans, and liabilities assumed are recorded at fair value. The Company typically issues common stock and/or pays cash for an acquisition, depending on the terms of the acquisition agreement. The value of shares of common stock issued is determined based upon the market price of the stock as of the closing of the acquisition. Reclassifications Certain amounts, previously reported, have been reclassified to state all periods on a comparable basis and had no effect on shareholders' equity or net income. 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 2020 Form 10-K. 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 significant events or transactions that occurred after September 30, 2021 through the date of filing this Quarterly Report on Form 10-Q and determined that there were no events that required disclosure.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Acquisition	NOTE 2 – ACQUISITIONS FCB Acquisition Effective July 1, 2020, pursuant to the Agreement and Plan of Acquisition dated as of January 23, 2020 (the “FCB Acquisition Agreement”), by and between the Company and FCB Corporation, a Tennessee corporation (“FCB”), FCB was acquired by CapStar, with CapStar continuing as the surviving entity (the “FCB Acquisition”). Immediately following the FCB Acquisition, The First National Bank of Manchester, a national banking association and a wholly owned subsidiary of FCB, was acquired by CapStar Bank, a Tennessee chartered bank and a wholly owned subsidiary of CapStar (the “FNBM Merger”), with CapStar Bank continuing as the surviving entity in the FNBM Acquisition. Subject to the terms and conditions set forth in the FCB Acquisition Agreement, at the effective time of the FCB Acquisition, shares of common stock, par value $ 10.00 per share, of FCB (“FCB Common Stock”) issued and outstanding immediately prior to the completion of the FCB Acquisition (other than shares of FCB Common Stock owned or held by FCB, CapStar and their subsidiaries (in each case, other than shares of FCB Common Stock held in a fiduciary or agency capacity or in satisfaction of debts previously contracted) were collectively converted into the right to receive in the aggregate 2,966,918 shares of common stock, par value $ 1.00 per share, of CapStar (“CapStar Common Stock”), with cash (without interest) in lieu of fractional shares, and $ 22.2 million in cash, without interest. BOW Acquisition Effective July 1, 2020, following the FCB Acquisition, pursuant to the Plan of Bank Acquisition, dated as of January 23, 2020 (the “BOW Acquisition Agreement,” and together with the FCB Acquisition Agreement, the “Acquisition Agreements”), by and among CapStar, CapStar Bank and The Bank of Waynesboro, a Tennessee chartered bank (“BOW”), BOW was acquired by CapStar Bank, with CapStar Bank continuing as the surviving entity (the “BOW Acquisition,” and together with the FCB Acquisition, the “Acquisitions”). On the terms and subject to the conditions set forth in the BOW Acquisition Agreement, at the effective time of the BOW Acquisition, shares of common stock, par value $ 10.00 per share, of BOW (“BOW Common Stock”) issued and outstanding immediately prior to the completion of the BOW Acquisition (other than shares of BOW Common Stock owned or held by CapStar, CapStar Bank, BOW and their subsidiaries (in each case, other than shares of BOW Common Stock held in a fiduciary or agency capacity or in satisfaction of debts previously contracted)) were collectively converted into the right to receive in the aggregate 664,800 shares of CapStar Common Stock, with cash (without interest) in lieu of fractional shares, and $ 5.1 million in cash, without interest. Total acquisition consideration resulting from the Acquisitions amounted to approximately $ 70.9 million. With the acquisitions, the Company further expanded its franchise in the Middle Tennessee market. FCB’s and BOW’s results of operations were included in the Company’s results beginning July 1, 2020. Acquisition related costs of $ 2.5 million and $ 3.3 million are included in the Company’s consolidated statements of income for the three and nine months ended September 30, 2020, respectively. The fair value of the common shares issued as part of the consideration paid for the Acquisitions was determined by the closing price of the Company’s common shares immediately preceding the acquisition date. Goodwill of $ 3.6 million associated with the acquisitions is not amortizable for book or tax purposes. The following table summarizes the consideration paid for the acquisitions and the amounts of the assets acquired and liabilities assumed recognized at the acquisition date (in thousands): As recorded by FCB Corporation Initial fair value adjustments Measurement period adjustments As recorded by CapStar Financial Holdings Assets: Cash and cash equivalents $ 90,760 $ — $ — $ 90,760 Securities 98,536 159 (a) — 98,695 Loans, gross 296,992 ( 2,318 ) (b) — 294,674 Allowance for loan losses ( 4,544 ) 4,544 (c) — — Premises and equipment, net 9,907 1,540 (d) — 11,447 Core deposit intangible — 3,570 (e) — 3,570 Other 16,514 ( 917 ) (f) — 15,597 Total $ 508,165 $ 6,578 $ — $ 514,743 Liabilities: Deposits $ 440,025 $ 2,652 (g) $ — $ 442,677 Other 4,735 — — 4,735 Total $ 444,760 $ 2,652 $ — $ 447,412 Net identifiable assets acquired $ 67,331 Total cost of acquisition: Value of stock issued $ 43,611 Cash consideration paid 27,278 Total cost of acquisition $ 70,889 Goodwill recorded related to acquisition $ 3,558 (a) The amount represents the fair value adjustment of acquired securities that were subsequently sold. (b) The amount represents the adjustment of the net book value of acquired loans to their estimated fair value based on interest rates and expected cash flows at the date of acquisition. (c) The amount represents the removal of FCB’s and BOW’s existing allowance for loan losses. (d) The amount represents the adjustment of the net book value of acquired premises and equipment to their estimated fair value. (e) The amount represents the adjustment of recording the fair value of the core deposit intangible representing the intangible value of the deposit base acquired and the fair value of the customer relationship. (f) The amount represents the net adjustment of the deferred tax asset recognized on the fair value adjustments on acquired assets and assumed liabilities. (g) The amount represents the adjustment necessary because the weighted average interest rate of acquired time deposits exceeded

Securities

Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Securities	NOTE 3 – SECURITIES The amortized cost and fair value of securities available-for-sale and held-to-maturity at September 30, 2021 and December 31, 2020 are summarized as follows (in thousands): September 30, 2021 December 31, 2020 Amortized Gross Gross Estimated Amortized Gross Gross Estimated Securities available-for-sale: U. S. government agency securities $ 11,588 $ 101 $ ( 79 ) $ 11,610 $ 16,158 $ 258 $ ( 25 ) $ 16,391 State and municipal securities 82,471 1,996 ( 780 ) 83,687 89,081 2,928 ( 81 ) 91,928 Mortgage-backed securities 324,862 2,814 ( 7,176 ) 320,500 332,014 4,892 ( 543 ) 336,363 Asset-backed securities 3,325 19 — 3,344 3,325 — ( 132 ) 3,193 Other debt securities 63,271 1,592 ( 226 ) 64,637 37,608 819 ( 87 ) 38,340 Total $ 485,517 $ 6,522 $ ( 8,261 ) $ 483,778 $ 478,186 $ 8,897 $ ( 868 ) $ 486,215 Securities held-to-maturity: State and municipal securities $ 1,788 $ 59 $ — $ 1,847 $ 2,407 $ 97 $ — $ 2,504 Total $ 1,788 $ 59 $ — $ 1,847 $ 2,407 $ 97 $ — $ 2,504 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 September 30, 2021 and December 31, 2020, 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 September 30, 2021 Estimated Gross Estimated Gross Estimated Gross U. S. government agency securities $ 2,931 $ ( 40 ) $ 1,964 $ ( 39 ) $ 4,895 $ ( 79 ) State and municipal securities 34,046 ( 546 ) 5,479 ( 234 ) 39,525 ( 780 ) Mortgage-backed securities 197,864 ( 5,773 ) 41,195 ( 1,403 ) 239,059 ( 7,176 ) Asset-backed securities — — — — — — Other debt securities 23,238 ( 226 ) — — 23,238 ( 226 ) Total temporarily impaired securities $ 258,079 $ ( 6,585 ) $ 48,638 $ ( 1,676 ) $ 306,717 $ ( 8,261 ) December 31, 2020 U. S. government agency securities $ 1,989 $ ( 25 ) $ — $ — $ 1,989 $ ( 25 ) State and municipal securities 10,463 ( 81 ) — — 10,463 ( 81 ) Mortgage-backed securities 100,291 ( 479 ) 1,449 ( 64 ) 101,740 ( 543 ) Asset-backed securities — — 3,193 ( 132 ) 3,193 ( 132 ) Other debt securities 6,103 ( 87 ) — — 6,103 ( 87 ) Total temporarily impaired securities $ 118,846 $ ( 672 ) $ 4,642 $ ( 196 ) $ 123,488 $ ( 868 ) As noted in the table above, as of September 30, 2021 , the Company had gross unrealized losses of $ 8.3 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 an expected 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. Since the Company currently does not intend to sell any investment securities that have an unrealized loss at September 30, 2021, and it is not likely 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 September 30, 2021. Securities with a market value of $ 201.5 million at September 30, 2021 were pledged to collateralize public deposits, derivative positions and Federal Home Loan Bank advances. Results from sales, maturities, prepayments and calls of securities available for sale were as follows (in thousands): Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 Proceeds $ 74,305 $ 141,347 Gross gains 44 83 Gross losses ( 24 ) ( 9 ) The amortized cost and fair value of securities at September 30, 2021, 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 Estimated Amortized Estimated Due in less than one year $ 17,820 $ 17,905 $ — $ — Due one to five years 73,699 75,446 1,788 1,847 Due five to ten years 55,125 56,249 — — Due beyond ten years 10,686 10,334 — — Mortgage-backed securities 324,862 320,500 — — Asset-backed securities 3,325 3,344 — — Total $ 485,517 $ 483,778 $ 1,788 $ 1,847

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans and Allowance for Loan Losses	NOTE 4 – LOANS AND ALLOWANCE FOR LOAN LOSSES A summary of the loans held for investment portfolio as of September 30, 2021 and December 31, 2020 follows (in thousands): September 30, 2021 December 31, 2020 Commercial real estate $ 772,996 $ 643,832 Consumer real estate 328,262 343,791 Construction and land development 210,516 174,859 Commercial and industrial 478,279 623,446 Consumer 45,669 44,279 Other 58,527 53,483 Total 1,894,249 1,883,690 Allowance for loan losses ( 22,533 ) ( 23,245 ) Total loans, net $ 1,871,716 $ 1,860,445 Payroll Protection Program Loans In 2020, the CARES Act created a new guaranteed, unsecured loan program under the SBA called the Payroll Protection Program (“PPP”), which the Company participates in, to fund operational costs of eligible businesses, organizations and self-employed persons during the pandemic period. The SBA has guaranteed 100% of the amounts loaned under the PPP by lenders to eligible small businesses. One of the notable features of the PPP is that borrowers are eligible for loan forgiveness if certain conditions are met related to retaining staff and if loan amounts are used to cover eligible expenses, such as payroll, mortgage interest, rents and utilities payments. These loans have a two to five year term and will earn interest at a rate of 1 %. As of September 30, 2021 , the outstanding balance of loans originated under the PPP totaled $ 64.2 million compared with $ 185.5 million as of December 31, 2020 and was included in commercial and industrial loans. Additionally, PPP borrowers are not required to pay any fees to the government or the lender and the loans may be repaid by the borrower at any time. The SBA, however, will pay lenders a processing fee based on the size of the PPP loan, ranging from 1 % to 5 % of the loan. Unamortized fees associated with PPP loans included in total loans were $ 2.2 million as of September 30, 2021 . These fees are deferred and amortized over the life of the loan. PPP fees recognized as income totaled $ 1.7 million and $ 5.6 million, respectively, for the three and nine months ended September 30, 2021 , compared to $ 1.0 million and $ 1.9 million for the same periods in 2020. Allowance for Loan Losses 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’s evaluation of other external factors included consideration of continuing developments regarding the novel coronavirus (“COVID-19”) global pandemic (including the effects of COVID-19 variants) and the resulting impact on the Company’s loan portfolio as of September 30, 2021, which is largely uncertain due to rapidly evolving conditions. 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 provides the risk category of loans by applicable class of loans as of September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Pass Special Substandard Doubtful Total Impaired Total Commercial real estate $ 748,967 $ 13,755 $ 4,960 $ — $ 1,154 $ 768,836 Consumer real estate 312,991 482 855 — 884 315,212 Construction and land development 207,617 2,844 11 — — 210,472 Commercial and industrial 451,180 10,194 14,382 26 63 475,845 Consumer 44,344 — 53 28 2 44,427 Other 58,107 — 79 — — 58,186 Purchased credit impaired 17,060 — 3,931 280 — 21,271 Total $ 1,840,266 $ 27,275 $ 24,271 $ 334 $ 2,103 $ 1,894,249 December 31, 2020 Commercial real estate $ 601,133 $ 33,046 $ 2,933 $ — $ 1,179 $ 638,291 Consumer real estate 323,072 1,375 1,122 — 1,707 327,276 Construction and land development 169,315 5,153 19 — 102 174,589 Commercial and industrial 568,767 25,855 25,666 — 168 620,456 Consumer 41,640 4 18 2 7 41,671 Other 52,949 — 66 — — 53,015 Purchased credit impaired 23,899 — 4,412 81 — 28,392 Total $ 1,780,775 $ 65,433 $ 34,236 $ 83 $ 3,163 $ 1,883,690 The following table details the changes in the ALL for the three and nine month periods ended September 30, 2021 and 2020 (in thousands): Commercial Consumer Construction Commercial Consumer Other Total Three Months Ended September 30, 2021 Balance, beginning of period $ 7,915 $ 1,730 $ 3,871 $ 8,401 $ 356 $ 481 $ 22,754 Charged-off loans — — — ( 125 ) ( 62 ) ( 80 ) ( 267 ) Recoveries — 17 — 1 17 11 46 Provision for loan losses ( 521 ) 596 239 ( 664 ) 124 226 — Balance, end of period $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Three Months Ended September 30, 2020 Balance, beginning of period $ 5,139 $ 1,398 $ 2,387 $ 11,514 $ 234 $ 363 $ 21,035 Charged-off loans — — — — ( 30 ) ( 22 ) ( 52 ) Recoveries 13 1 — 3 16 32 65 Provision for loan losses 677 418 795 183 ( 20 ) 66 2,119 Balance, end of period $ 5,829 $ 1,817 $ 3,182 $ 11,700 $ 200 $ 439 $ 23,167 Commercial Consumer Construction Commercial Consumer Other Total Nine Months Ended September 30, 2021 Balance, beginning of period $ 7,349 $ 1,831 $ 3,476 $ 9,708 $ 305 $ 576 $ 23,245 Charged-off loans ( 10 ) ( 1 ) — ( 132 ) ( 106 ) ( 158 ) ( 407 ) Recoveries — 22 — 2 63 23 110 Provision for loan losses 55 491 634 ( 1,965 ) 173 197 ( 415 ) Balance, end of period $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Nine Months Ended September 30, 2020 Balance, beginning of period $ 3,599 $ 1,231 $ 2,058 $ 5,074 $ 222 $ 420 $ 12,604 Charged-off loans ( 3 ) ( 43 ) — ( 710 ) ( 83 ) ( 175 ) ( 1,014 ) Recoveries 10 4 — 162 58 48 282 Provision for loan losses 2,223 625 1,124 7,174 3 146 11,295 Balance, end of period $ 5,829 $ 1,817 $ 3,182 $ 11,700 $ 200 $ 439 $ 23,167 A breakdown of the ALL and the loan portfolio by loan category at September 30, 2021 and December 31, 2020 follows (in thousands): Commercial Consumer Construction Commercial Consumer Other Total September 30, 2021 Allowance for Loan Losses: Collectively evaluated for impairment $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Individually evaluated for impairment — — — — — — — Purchased credit impaired — — — — — — — Balances, end of period $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Loans: Collectively evaluated for impairment $ 767,682 $ 314,328 $ 210,472 $ 475,782 $ 44,425 $ 58,186 $ 1,870,875 Individually evaluated for impairment 1,154 884 — 63 2 — 2,103 Purchased credit impaired 4,160 13,050 44 2,434 1,242 341 21,271 Balances, end of period $ 772,996 $ 328,262 $ 210,516 $ 478,279 $ 45,669 $ 58,527 $ 1,894,249 December 31, 2020 Allowance for Loan Losses: Collectively evaluated for impairment $ 7,349 1,831 3,410 9,708 305 576 $ 23,179 Individually evaluated for impairment — — 66 — — — 66 Purchased credit impaired — — — — — — — Balances, end of period $ 7,349 $ 1,831 $ 3,476 $ 9,708 $ 305 $ 576 $ 23,245 Loans: Collectively evaluated for impairment $ 637,112 $ 325,569 $ 174,487 $ 620,288 $ 41,664 $ 53,015 $ 1,852,135 Individually evaluated for impairment 1,179 1,707 102 168 7 — 3,163 Purchased credit impaired 5,541 16,515 270 2,990 2,608 468 28,392 Balances, end of period $ 643,832 $ 343,791 $ 174,859 $ 623,446 $ 44,279 $ 53,483 $ 1,883,690 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 September 30, 2021 and December 31, 2020 (in thousands). PPP loans included in commercial and industrial loans in the below table do not have a corresponding ALL as they are fully guaranteed by the SBA: September 30, 2021 December 31, 2020 Amount Percent of total Amount Percent of total Commercial real estate $ 7,394 0.39 % $ 7,349 0.39 % Consumer real estate 2,343 0.12 1,831 0.10 Construction and land development 4,110 0.22 3,476 0.18 Commercial and industrial 7,613 0.41 9,708 0.51 Consumer 435 0.02 305 0.02 Other 638 0.03 576 0.03 Total allowance for loan losses $ 22,533 1.19 % $ 23,245 1.23 % The following table presents the Company’s impaired loans that were evaluated for specific loss allowance, excluding purchased credit impaired (“PCI”) loans, as of September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 December 31, 2020 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate $ 1,154 $ 1,135 $ — $ 1,179 $ 1,176 $ — Consumer real estate 884 909 — 1,707 1,608 — Construction and land development — — — — — — Commercial and industrial 63 63 — 168 457 — Consumer 2 2 — 7 7 — Other — — — — — — Subtotal 2,103 2,109 — 3,061 3,248 — With an allowance recorded: Commercial real estate — — — — — — Consumer real estate — — — — — — Construction and land development — — — 102 102 66 Commercial and industrial — — — — — — Consumer — — — — — — Other — — — — — — Subtotal — — — 102 102 66 Total $ 2,103 $ 2,109 $ — $ 3,163 $ 3,350 $ 66 The following table presents information related to the average recorded investment and interest income recognized on impaired loans, excluding PCI loans, for the three and nine month periods ended September 30, 2021 and 2020 (in thousands): Three Months Ended Three Months Ended Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 Average Interest Average Interest Average Interest Average Interest With no related allowance recorded: Commercial real estate $ 1,159 $ 16 $ 1,191 $ 17 $ 1,174 $ 48 $ 1,458 $ 57 Consumer real estate 889 — 961 9 1,181 — 982 27 Construction and land development — — — — — — — — Commercial and industrial 63 — 90 — 64 1 176 2 Consumer 2 — 4 — 49 — 4 — Other — — — — — — — — Subtotal 2,113 16 2,246 26 2,468 49 2,620 86 With an allowance recorded: Commercial real estate — — — — — — — — Consumer real estate — — — — — — — — Construction and land development — — — — — — — — Commercial and industrial — — 107 — — — 108 — Consumer — — — — — — — — Other — — — — — — — — Subtotal — — 107 — — — 108 — Total $ 2,113 $ 16 $ 2,353 $ 26 $ 2,468 $ 49 $ 2,728 $ 86 There was no interest income recognized on a cash basis for impaired loans during the three or nine month periods ended September 30, 2021 or 2020. The following table presents the aging of the recorded investment in past due loans as of September 30, 2021 and December 31, 2020 by class of loans (in thousands): 30 - 59 60 - 89 Greater Than Days Days 89 Days Total Loans Not Past Due Past Due Past Due Past Due Past Due Total September 30, 2021 Commercial real estate $ 65 $ — $ 1,257 1,322 $ 767,514 $ 768,836 Consumer real estate 425 496 187 1,108 314,104 315,212 Construction and land development 30 — 12 42 210,430 210,472 Commercial and industrial 437 503 45 985 474,860 475,845 Consumer 160 99 38 297 44,130 44,427 Other 78 316 — 394 57,792 58,186 Purchased credit impaired 932 79 794 1,805 19,466 21,271 Total $ 2,127 $ 1,493 $ 2,333 $ 5,953 $ 1,888,296 $ 1,894,249 December 31, 2020 Commercial real estate $ 409 $ — $ 1,176 $ 1,585 $ 636,706 $ 638,291 Consumer real estate 6,084 1,596 687 8,367 318,909 327,276 Construction and land development 2,670 745 — 3,415 171,174 174,589 Commercial and industrial 1,734 38 1,595 3,367 617,089 620,456 Consumer 270 40 7 317 41,354 41,671 Other 252 38 — 290 52,725 53,015 Purchased credit impaired 1,372 1,554 901 3,827 24,565 28,392 Total $ 12,791 $ 4,011 $ 4,366 $ 21,168 $ 1,862,522 $ 1,883,690 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 September 30, 2021 and December 31, 2020 (in thousands): Non-Accrual Past Due Over 89 Days and Accruing Troubled Debt Restructurings September 30, 2021 Commercial real estate $ 115 $ 1,257 $ 1,135 Consumer real estate 1,174 77 661 Construction and land development — 12 — Commercial and industrial 89 45 63 Consumer 47 — — Other — — — Purchased credit impaired 2,006 169 — Total $ 3,431 $ 1,560 $ 1,859 December 31, 2020 Commercial real estate $ 130 $ 1,176 $ 1,176 Consumer real estate 1,821 342 685 Construction and land development 107 — — Commercial and industrial 470 1,205 67 Consumer 9 5 — Other — — — Purchased credit impaired 2,279 567 — Total $ 4,816 $ 3,295 $ 1,928 As of September 30, 2021 and December 31, 2020, all loans classified as nonperforming were deemed to be impaired. As of September 30, 2021 and December 31, 2020 , the Company had a recorded investment in TDR of $ 1.9 million. The Company had no specific allowance for those loans at September 30, 2021 or December 31, 2020 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. In accordance with interagency guidance, short term deferrals granted due to the COVID-19 pandemic are not considered TDR unless the borrower was experiencing financial difficulty prior to the pandemic. There were no new TDR identified during the three or nine months ended September 30, 2021 or 2020. There were no TDR for which there was a payment default within twelve months following the modification during the three or nine months ended September 30, 2021 or 2020. A loan is considered to be in payment default once it is 30 days contractually past due under the modified terms. Acquired Loans On July 1, 2020, the Company acquired FCB and BOW (see Note 2 for more information). As a result of the acquisitions, the Company recorded loans with a fair value of $ 294.7 million. Of those loans, $ 33.6 million were considered to be purchased credit impaired (“PCI”) loans, which are loans for which it is probable at the acquisition date that all contractually required payments will not be collected. The remaining loans are considered to be purchased non-impaired loans and their related fair value discount or premium is recognized as an adjustment to yield over the remaining life of each loan. The following table relates to acquired FCB and BOW PCI loans and summarizes the contractually required payments, which includes principal and interest, expected cash flows to be collected, and the fair value of acquired PCI loans at the acquisition date (in thousands): FCB and BOW acquisitions on July 1, 2020 Contractually required payments $ 42,443 Nonaccretable difference 4,501 Cash flows expected to be collected at acquisition 37,942 Accretable yield 4,349 Fair value of PCI loans at acquisition date $ 33,593 The following table relates to purchased non-impaired loans acquired and provides the contractually required payments, fair value, and estimate of contractual cash flows not expected to be collected at the acquisition date (in thousands): FCB and BOW acquisitions on July 1, 2020 Contractually required payments $ 296,527 Fair value of acquired loans at acquisition date 260,701 Contractual cash flows not expected to be collected 3,718 Purchased Credit Impaired Loans The following table presents changes in the carrying value of PCI loans (in thousands) for the periods indicated: Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Balance at beginning of period $ 22,765 $ 28,392 Change due to payments received and accretion ( 1,494 ) ( 7,121 ) Balance at end of period $ 21,271 $ 21,271 The following table presents changes in the accretable yield for PCI loans (in thousands) for the periods indicated: Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Balance at beginning of period $ 3,169 $ 4,068 Accretion ( 603 ) ( 1,502 ) Balance at end of period $ 2,566 $ 2,566 PCI loans had no impact on the ALL for the three or nine months ended September 30, 2021 .

Premises and Equipment

Premises and Equipment	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Premises and Equipment	NOTE 5 – PREMISES AND EQUIPMENT The Company leases certain premises and equipment under operating leases. At September 30, 2021 , the Company had lease liabilities totaling $ 12.2 million and right-of-use assets totaling $ 11.4 million related to these leases. Lease liabilities and right-of-use assets are reflected in other liabilities and other assets, respectively. At September 30, 2021 , the weighted average remaining lease term for operating leases was 9.3 years and the weighted average discount rate used in the measurement of operating lease liabilities was 3.42 %. Lease costs were as follows (in thousands): Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Operating lease cost $ 514 $ 1,588 Short-term lease cost — — Variable lease cost — — Total lease cost $ 514 $ 1,588 There were no sale and leaseback transactions, leveraged leases, or lease transactions with related parties during the three or nine months ended September 30, 2021 or 2020. 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): September 30, 2021 Lease payments due: 2021 $ 432 2022 1,751 2023 1,717 2024 1,425 2025 1,428 2026 and thereafter 7,655 Total undiscounted cash flows 14,408 Discount on cash flows ( 2,181 ) Total lease liability $ 12,227

Short Term Borrowings And Long-

Short Term Borrowings And Long-Term Debt	9 Months Ended
	Sep. 30, 2021
Federal Home Loan Banks [Abstract]
Short Term Borrowings And Long-Term Debt	NOTE 6 – SHORT TERM BORROWINGS AND LONG-TERM DEBT Short-Term Borrowings The Company had no outstanding advances as of September 30, 2021 compared to $ 10 million as of December 31, 2020. Advances from the FHLB are collateralized by investment securities with a market value of $ 2.2 million, FHLB stock and certain commercial and residential real estate mortgage loans totaling $ 634.1 million under a blanket mortgage collateral agreement. At September 30, 2021 , the amount of available credit from the FHLB totaled $ 448.9 million. Subordinated Notes The Company issued $ 30.0 million of fixed-to-floating rate subordinated notes during the third quarter of 2020, which were recorded net of issuance costs of $ 0.6 million, that mature June 30, 2030 . Beginning on or after June 30, 2025 , the Company may redeem the notes, in whole or in part, at their principal amount plus any accrued and unpaid interest. The notes have a fixed interest rate of 5.25 % per annum for the first five years. Thereafter, the interest rate will reset quarterly to an interest rate per annum equal to a benchmark rate (which is expected to be Three-Month Term SOFR) plus 513 basis points. The carrying value of subordinated notes was $ 29.5 million at September 30, 2021 and $ 29.4 million at December 31, 2020.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	NOTE 7 – ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following were changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods ended September 30, 2021 and 2020 (in thousands): Unrealized Gains Gains and and Losses Losses on on Available Cash Flow for Sale Hedges Securities Total Nine Months Ended September 30, 2021 Beginning balance $ — $ 7,728 $ 7,728 Other comprehensive loss before — ( 7,214 ) ( 7,214 ) Amounts reclassified from accumulated other — ( 15 ) ( 15 ) Net current period other comprehensive loss — ( 7,229 ) ( 7,229 ) Ending Balance $ — $ 499 $ 499 Nine Months Ended September 30, 2020 Beginning balance $ ( 2,679 ) $ 4,062 $ 1,383 Other comprehensive income before — 2,797 2,797 Amounts reclassified from accumulated other 2,679 ( 55 ) 2,624 Net current period other comprehensive income 2,679 2,742 5,421 Ending Balance $ — $ 6,804 $ 6,804 The following amounts were reclassified out of each component of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2021 and 2020 (in thousands): Affected Line Item Details about Accumulated Other Three Months Ended September 30, Nine Months Ended September 30, in the Statement Where Comprehensive Income (Loss) Components 2021 2020 2021 2020 Net Income is Presented Realized losses on cash flow hedges $ — $ ( 2,060 ) $ — $ ( 2,466 ) Interest expense - money market accounts — ( 107 ) — ( 213 ) Interest expense - Federal Home Loan Bank advances — — — — Income tax benefit (expense) $ — $ ( 2,167 ) $ — $ ( 2,679 ) Net of tax Realized gains on available- $ 7 $ 34 $ 20 $ 74 Net gain on sale of securities ( 2 ) ( 9 ) ( 5 ) ( 19 ) Income tax expense $ 5 $ 25 $ 15 $ 55 Net of tax

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 8 – INCOME TAXES The Company’s effective tax rate for the three and nine month periods ended September 30, 2021 was 19.4 % and 20.0 %, respectively, compared to 22.0 % and 18.0 % for the three and nine months ended September 30, 2020, respectively. The three month period decrease is attributable to a revision in the Company's expected annual effective tax rate for 2021 based on continued benefits in the Company's tax strategy. The increase in the effective tax rate from the nine month period ended September 30, 2020 is largely the result of the impact of certain provisions under the CARES Act, which were effective for 2020. The CARES Act permitted NOL’s arising in taxable years beginning after December 31, 2017 and before January 1, 2021 to be carried back five taxable years. This enabled the Company to carry back losses in 2020, which were incurred during the taxable year 2018 to prior years with a higher statutory tax rate, creating a permanent tax rate benefit. As a result, the Company recorded an income tax benefit of $ 0.8 million related to the permanent tax rate benefit during the first nine months of 2020. The effective tax rate for the three and nine month periods ended September 30, 2021 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, tax benefits of CapStar Bank’s real estate investment trust subsidiary, community investment tax credits, and tax benefits associated with share-based compensation, net of the effect of certain non-deductible expenses.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 9 – 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 September 30, 2021 and December 31, 2020 (in thousands): Contract or notional amount September 30, 2021 December 31, 2020 Financial instruments whose contract amounts represent Unused commitments to extend credit $ 806,444 $ 804,520 Standby letters of credit 10,397 10,403 Total $ 816,841 $ 814,923 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 September 30, 2021 , will not have a material impact on the financial statements of the Company.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	NOTE 10 – 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 There were no interest rate swaps designated as cash flow hedges as of September 30, 2021 and December 31, 2020. The Company previously terminated an interest rate swap during 2019, which resulted in a termination fee of $ 1.5 million which continued to be amortized as the corresponding hedged items, consisting of LIBOR-based brokered deposits and FHLB borrowings, were expected to remain outstanding until the initial maturities of the terminated swaps. However, during the year ended December 31, 2020, it was determined that in light of the Company’s surplus liquidity position this funding was expected to be terminated at the next renewal date and thus the previously terminated interest rate swaps which had been designated as cash flow hedges were no longer deemed effective, therefore, remaining unrealized losses of $ 1.9 million included in accumulated other comprehensive income were recognized in net income. There are no other interest rate swap related unrealized gains or losses in accumulated other comprehensive income as of September 30, 2021. Other Interest Rate Swaps The Company 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 market risk to the Company. A summary of the Company’s customer related interest rate swaps was as follows (in thousands): September 30, 2021 December 31, 2020 Notional Estimated Notional Estimated amount fair value amount fair value Interest rate swap agreements: Pay fixed/receive variable swaps $ 58,040 $ ( 2,118 ) $ 59,946 $ ( 2,740 ) Pay variable/receive fixed swaps 58,040 2,118 59,946 2,740 Total $ 116,080 $ — $ 119,892 $ — Mortgage Banking Derivatives The Company enters into various derivative agreements with customers in the form of interest-rate lock commitments, which are commitments to originate mortgage loans whereby the interest rate on the loan is determined prior to funding and the customers have locked into that interest rate. The derivatives are valued using a model that utilizes market interest rates and other unobservable inputs. Changes in the fair value of these commitments due to fluctuations in interest rates that are to be originated to our loans held for sale portfolio are economically hedged through the use of forward sale commitments of mortgage-backed securities. The gains and losses arising from this derivative activity are reflected in current period earnings under mortgage banking income. Interest rate lock commitments are valued using a model with significant unobservable market parameters. Forward sale commitments are valued based on quoted prices for similar assets in an active market with inputs that are observable. The net (losses) gains relating to mortgage banking derivative instruments included in mortgage banking income were as follows (in thousands): Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Mortgage loan interest rate lock commitments $ ( 221 ) $ ( 1,528 ) Mortgage-backed securities forward sales commitments 307 919 Total $ 86 $ ( 609 ) The amount and fair value of mortgage banking derivatives included in the consolidated balance sheets were as follows (in thousands): September 30, 2021 December 31, 2020 Notional Estimated Notional Estimated amount fair value amount fair value Included in other assets: Mortgage loan interest rate lock commitments $ 86,938 $ 1,079 $ 88,303 $ 2,607 Mortgage-backed securities forward sales commitments 72,500 293 — — Included in other liabilities: Mortgage-backed securities forward sales commitments $ — $ — $ 87,000 $ ( 626 )

Stock Options and Restricted Sh

Stock Options and Restricted Shares	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock Options and Restricted Shares	NOTE 11 – STOCK OPTIONS AND RESTRICTED SHARES On April 23, 2021, the shareholders of CapStar Financial Holdings, Inc. approved the 2021 Stock Incentive Plan (the "Plan"). The 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. A total of 1,168,543 shares of stock were reserved for issuance under the Plan. Stock incentives include both restricted share and stock option grants. Total shares issuable under the plan were 1,168,543 as of September 30, 2021. 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 Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Stock-based compensation expense before income taxes $ 373 $ 330 $ 1,169 $ 1,231 Less: deferred tax benefit ( 98 ) ( 86 ) ( 306 ) ( 322 ) Reduction of net income $ 275 $ 244 $ 863 $ 909 Restricted Shares, Restricted Stock Units, and Performance Stock Units We grant time-vested restricted stock units and performance stock units to certain key employees and directors under our stock award plan. Compensation expense is recognized over the vesting period of the awards based on the fair value of the stock at the issue date. Those granted after January 1, 2021, vest ratably over a two or three -year vesting period depending on the specific award. Performance stock units vest based upon the attainment of certain performance metrics over a three -year cumulative performance period. Certain of these awards are eligible to receive dividend equivalent shares. The grant date fair value of these awards was estimated using a Monte Carlo simulation. For awards based upon the achievement of the performance goals, the awards are earned ratably from 0 % to 188 %. If the performance goals are met at the end of the performance period, the award is adjusted to reflect the Company’s three-year total shareholder return (TSR) performance relative to a capital market peer group. This TSR modifier cannot cause the award to exceed the maximum of 188 %. 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. A summary of the changes in the Company’s nonvested restricted shares for the nine months ended September 30, 2021 follows: Weighted Average Restricted Grant Date Nonvested Shares Shares Fair Value Nonvested at beginning of period 148,414 $ 14.39 Granted 140,549 14.81 Vested ( 64,062 ) 14.99 Forfeited ( 23,222 ) 14.52 Nonvested at end of period 201,679 $ 14.10 As of September 30, 2021 , there was $ 1.9 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 2.0 years. The total fair value of shares vested during the nine months ended September 30, 2021 was $ 1.1 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 2021 or 2020. A summary of the activity in stock options for the nine months ended September 30, 2021 follows: Weighted Weighted Average Average Remaining Exercise Contractual Shares Price Term (years) Outstanding at beginning of period 226,589 $ 11.73 Granted — — Exercised ( 96,344 ) 11.41 Forfeited or expired — — Outstanding at end of period 130,245 $ 11.96 5.2 Fully vested and expected to vest 130,245 $ 11.96 5.2 Exercisable at end of period 113,578 $ 11.54 4.8 Information related to stock options during each year follows: 2021 2020 Intrinsic value of options exercised $ 821,174 $ 188,662 Cash received from option exercises 1,077,489 105,847 Tax benefit realized from option exercises 148,312 16,524 Weighted average fair value of options granted — — As of September 30, 2021 , there was $ 0.1 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 0.6 years.

Regulatory Capital Requirements

Regulatory Capital Requirements	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Interest [Abstract]
Regulatory Capital Requirements	NOTE 12 – 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 September 30, 2021, 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 September 30, 2021 and December 31, 2020 are presented in the following table (dollars in thousands). Actual Minimum capital Minimum to be Amount Ratio Amount Ratio Amount Ratio At September 30, 2021: Total capital to risk-weighted assets: CapStar Financial Holdings, Inc. $ 373,051 16.23 % $ 183,922 8.0 % N/A N/A CapStar Bank 359,460 15.65 183,781 8.0 $ 229,726 10 % Tier I capital to risk-weighted assets: CapStar Financial Holdings, Inc. 320,700 13.95 137,941 6.0 N/A N/A CapStar Bank 336,608 14.65 137,835 6.0 183,781 8.00 Common equity Tier 1 capital to risk weighted CapStar Financial Holdings, Inc. 320,700 13.95 103,456 4.5 N/A N/A CapStar Bank 320,108 13.93 103,377 4.5 149,322 6.50 Tier I capital to average assets: CapStar Financial Holdings, Inc. 320,700 10.28 124,771 4.0 N/A N/A CapStar Bank 336,608 10.82 124,449 4.0 155,561 5.00 At December 31, 2020: Total capital to risk-weighted assets: CapStar Financial Holdings, Inc. $ 338,426 16.03 % $ 168,910 8.0 % N/A N/A CapStar Bank 324,152 15.36 168,808 8.0 $ 211,010 10.0 Tier I capital to risk-weighted assets: CapStar Financial Holdings, Inc. 285,439 13.52 126,682 6.0 N/A N/A CapStar Bank 300,588 14.25 126,606 6.0 168,808 8.0 Common equity Tier 1 capital to risk weighted CapStar Financial Holdings, Inc. 285,439 13.52 95,012 4.5 N/A N/A CapStar Bank 284,088 13.46 94,954 4.5 137,156 6.5 Tier I capital to average assets: CapStar Financial Holdings, Inc. 285,439 9.60 118,877 4.0 N/A N/A CapStar Bank 300,588 10.12 118,780 4.0 148,476 5.0 (1) For the calendar year 2021, 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.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 13 – EARNINGS PER SHARE The following is a summary of the basic and diluted earnings per share calculation for the three and nine month periods ended September 30, 2021 and 2020 (in thousands except share and per share data): Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Basic net income per share calculation: Numerator – Net income $ 13,102 $ 7,487 $ 36,207 $ 15,015 Denominator – Average common shares outstanding 22,164,278 21,948,579 22,114,948 19,558,281 Basic net income per share $ 0.59 $ 0.34 $ 1.64 $ 0.77 Diluted net income per share calculation: Numerator – Net income $ 13,102 $ 7,487 $ 36,207 $ 15,015 Denominator – Average common shares outstanding 22,164,278 21,948,579 22,114,948 19,558,281 Dilutive shares contingently issuable 54,124 11,911 50,182 25,167 Average diluted common shares outstanding 22,218,402 21,960,490 22,165,130 19,583,448 Diluted net income per share $ 0.59 $ 0.34 $ 1.63 $ 0.77

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value	NOTE 14 – 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. 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 September 30, 2021 or December 31, 2020. Loans Held For Sale : Loans held for sale are carried at either fair value, if elected, or the lower of cost or fair value on a pool-level basis. Origination fees and costs for loans held for sale recorded at lower of cost or market are capitalized in the basis of the loan and are included in the calculation of realized gains and losses upon sale. Origination fees and costs are recognized in earnings at the time of origination for loans held for sale that are recorded at fair value. Fair value is determined using quoted prices for similar assets, adjusted for specific attributes of that loan or other observable market data, such as outstanding commitments from third party investors (Level 2). Derivatives-Mortgage Loan Interest Rate Lock Commitments : Interest rate lock commitments that relate to the origination of mortgage loans that will be held for sale are recorded at fair value, determined as the amount that would be required to settle each derivative instrument at the balance sheet date. The fair value of the interest rate lock commitment is derived from the fair value of related mortgage loans, which is based on observable market data and includes the expected net future cash flows related to servicing of the loans. In estimating the fair value of an interest rate lock commitment, the Company assigns a probability to the interest rate lock commitment based on an expectation that it will be exercised and the loan will be funded (a “pull through” rate). The expected pull through rates are applied to the fair value of the unclosed mortgage pipeline, resulting in a Level 3 fair value classification. The pull through rate is a statistical analysis of our actual rate lock fallout history to determine the sensitivity of the residential mortgage loan pipeline compared to interest rate changes and other deterministic values. New market prices are applied based on updated loan characteristics and new fallout ratios (i.e., the inverse of the pull through rate) are applied accordingly. Significant increases (decreases) in the pull through rate in isolation result in a significantly higher (lower) fair value measurement. Changes to the fair value of interest rate lock commitments are recognized based on interest rate changes, changes in the probability that the commitment will be exercised, and the passage of time. Derivatives-Mortgage-Backed Securities Forward Sales Commitments : The Company utilizes mortgage-backed securities forward sales commitments to hedge mortgage loan interest rate lock commitments. Mortgage-backed securities forward sales commitments are recorded at fair value based on quoted prices for similar assets in an active market with inputs that are observable, resulting in a Level 2 fair value classification. Assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands): Fair value measurements at September 30, 2021 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 agency securities $ 11,610 $ — $ 11,610 $ — State and municipal securities 83,687 — 83,687 — Mortgage-backed securities 320,500 — 320,500 — Asset-backed securities 3,344 — 3,344 — Other debt securities 64,637 — 64,637 — Loans held for sale 79,842 — 79,842 — Derivative assets: Non-hedging derivatives: Interest rate swaps - customer related 2,118 — 2,118 — Mortgage loan interest rate lock commitments 1,079 — — 1,079 Mortgage-backed securities forward sales commitments 293 — 293 — Liabilities: Derivative liabilities: Non-hedging derivatives: Derivative Liabilities - customer related ( 2,118 ) — ( 2,118 ) — Fair value measurements at December 31, 2020 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 agency securities $ 16,391 $ — $ 16,391 $ — State and municipal securities 91,928 — 91,928 — Mortgage-backed securities 336,363 — 336,363 — Asset-backed securities 3,193 — 3,193 — Other debt securities 38,340 — 38,340 — Loans held for sale 97,303 — 97,303 — Derivative assets: Non-hedging derivatives: Interest rate swaps - customer related 2,740 — 2,740 — Mortgage loan interest rate lock commitments 2,607 — — 2,607 Liabilities: Derivative liabilities: Non-hedging derivatives: Interest rate swaps - customer related ( 2,740 ) — ( 2,740 ) — Mortgage-backed securities forward sales commitments ( 626 ) — ( 626 ) — The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30, 2021 and 2020 (in thousands): Mortgage Loan Interest Rate Lock Commitments 2021 2020 Balance of recurring Level 3 assets at January 1st $ 2,607 $ 648 Total gains or losses for the period: Included in mortgage banking income ( 1,528 ) 3,488 Balance of recurring Level 3 assets at September 30th $ 1,079 $ 4,136 The following table presents quantitative information about recurring Level 3 fair value measurements (dollars in thousands): Range Fair Valuation (Weighted- September 30, 2021 Value Technique(s) Unobservable Input(s) Average) Assets: Non-hedging derivatives: Mortgage loan interest rate lock commitments $ 1,079 Consensus pricing Origination pull-through rate 59 % - 96 % ( 82 %) Range Fair Valuation (Weighted- December 31, 2020 Value Technique(s) Unobservable Input(s) Average) Assets: Non-hedging derivatives: Mortgage loan interest rate lock commitments $ 2,607 Consensus pricing Origination pull-through rate 54 % - 91 % ( 74 %) There were no assets measured at fair value on a nonrecurring basis as of September 30, 2021. Assets measured at fair value on a nonrecurring basis as of December 31, 2020 are summarized below (in thousands). Fair value measurements at December 31, 2020 Quoted prices in active Significant markets for other Significant identical observable unobservable Carrying assets inputs inputs Value (level 1) (level 2) (level 3) Assets: Impaired loans: Commercial and industrial $ 36 — — 36 The following table presents quantitative information about December 31, 2020 Level 3 fair value measurements for assets measured at fair value on a non-recurring basis (dollars in thousands): Range Fair Valuation (Weighted- December 31, 2020 Value Technique(s) Unobservable Input(s) Average) Impaired loans: Commercial and industrial $ 36 Sales Comparison approach Appraisal discounts 10 % Fair Value of Financial Instruments The carrying value and estimated fair values of the Bank’s financial instruments at September 30, 2021 and December 31, 2020 were as follows (in thousands): September 30, 2021 December 31, 2020 Carrying Carrying Fair value amount Fair value amount Fair value level of input Financial assets: Cash and due from banks, interest-bearing deposits in $ 339,367 $ 339,367 $ 277,439 $ 277,439 Level 1 Federal funds sold 19,900 19,900 — — Level 1 Securities available-for-sale 483,778 483,778 486,215 486,215 Level 2 Securities held-to-maturity 1,788 1,847 2,407 2,504 Level 2 Loans held for sale 176,488 179,325 186,998 180,698 Level 2 Restricted equity securities 14,443 N/A 15,562 N/A N/A Loans held for investment 1,894,249 1,901,826 1,883,690 1,900,647 Level 3 Accrued interest receivable 7,606 7,606 8,771 8,771 Level 2 Other assets 83,072 83,072 46,381 46,381 Level 2 / Level 3 Financial liabilities: Deposits 2,674,392 2,535,324 2,568,001 2,472,860 Level 3 Subordinated notes and Federal Home Loan bank advances 29,499 31,022 39,423 41,400 Level 2 Other liabilities 2,902 2,902 3,334 3,334 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) Restricted Equity Securities It is not practical to determine the fair value of restricted securities due to restrictions placed on their transferability. (c) Loans 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. (d) Accrued Interest Receivable The carrying amounts of accrued interest approximate fair value. (e) Other Assets Included in other assets are bank owned life insurance and certain interest rate swap agreements. The fair values of interest rate swap agreements are based on independent pricing services that utilize pricing models with observable market inputs. For bank owned life insurance, the carrying amount is based on the cash surrender value and is a reasonable estimate of fair value. (f) 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. (g) Federal Home Loan Bank Advances and Subordinated Debt The fair value of fixed rate Federal Home Loan Bank Advances and subordinated notes is estimated using discounted cash flow models, using current market interest rates offered on certificates, advances and other borrowings with similar remaining maturities. (h) Other Liabilities Included in other liabilities are accrued interest payable and certain interest rate swap agreements. The fair values of interest rate swap agreements are based on independent pricing services that utilize pricing models with observable market inputs. The carrying amounts of accrued interest approximate fair value. (i) 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. (j) 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.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements as of and for the period ended September 30, 2021 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 notes 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 2020 Form 10-K.
Business Combinations	Business Combinations The Company accounts for business combinations using the acquisition method of accounting. The accounts of an acquired entity are included as of the date of acquisition, and any excess of purchase price over the fair value of the net assets acquired is capitalized as goodwill. Under this method, all identifiable assets acquired, including purchased loans, and liabilities assumed are recorded at fair value. The Company typically issues common stock and/or pays cash for an acquisition, depending on the terms of the acquisition agreement. The value of shares of common stock issued is determined based upon the market price of the stock as of the closing of the acquisition.
Reclassifications	Reclassifications Certain amounts, previously reported, have been reclassified to state all periods on a comparable basis and had no effect on shareholders' equity or net income.
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 2020 Form 10-K.
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 significant events or transactions that occurred after September 30, 2021 through the date of filing this Quarterly Report on Form 10-Q and determined that there were no events that required disclosure.

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Schedule of Consideration Paid and Amounts of Assets Acquired and Liabilities Assumed	The following table summarizes the consideration paid for the acquisitions and the amounts of the assets acquired and liabilities assumed recognized at the acquisition date (in thousands): As recorded by FCB Corporation Initial fair value adjustments Measurement period adjustments As recorded by CapStar Financial Holdings Assets: Cash and cash equivalents $ 90,760 $ — $ — $ 90,760 Securities 98,536 159 (a) — 98,695 Loans, gross 296,992 ( 2,318 ) (b) — 294,674 Allowance for loan losses ( 4,544 ) 4,544 (c) — — Premises and equipment, net 9,907 1,540 (d) — 11,447 Core deposit intangible — 3,570 (e) — 3,570 Other 16,514 ( 917 ) (f) — 15,597 Total $ 508,165 $ 6,578 $ — $ 514,743 Liabilities: Deposits $ 440,025 $ 2,652 (g) $ — $ 442,677 Other 4,735 — — 4,735 Total $ 444,760 $ 2,652 $ — $ 447,412 Net identifiable assets acquired $ 67,331 Total cost of acquisition: Value of stock issued $ 43,611 Cash consideration paid 27,278 Total cost of acquisition $ 70,889 Goodwill recorded related to acquisition $ 3,558 (a) The amount represents the fair value adjustment of acquired securities that were subsequently sold. (b) The amount represents the adjustment of the net book value of acquired loans to their estimated fair value based on interest rates and expected cash flows at the date of acquisition. (c) The amount represents the removal of FCB’s and BOW’s existing allowance for loan losses. (d) The amount represents the adjustment of the net book value of acquired premises and equipment to their estimated fair value. (e) The amount represents the adjustment of recording the fair value of the core deposit intangible representing the intangible value of the deposit base acquired and the fair value of the customer relationship. (f) The amount represents the net adjustment of the deferred tax asset recognized on the fair value adjustments on acquired assets and assumed liabilities. (g) The amount represents the adjustment necessary because the weighted average interest rate of acquired time deposits exceeded

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 are summarized as follows (in thousands): September 30, 2021 December 31, 2020 Amortized Gross Gross Estimated Amortized Gross Gross Estimated Securities available-for-sale: U. S. government agency securities $ 11,588 $ 101 $ ( 79 ) $ 11,610 $ 16,158 $ 258 $ ( 25 ) $ 16,391 State and municipal securities 82,471 1,996 ( 780 ) 83,687 89,081 2,928 ( 81 ) 91,928 Mortgage-backed securities 324,862 2,814 ( 7,176 ) 320,500 332,014 4,892 ( 543 ) 336,363 Asset-backed securities 3,325 19 — 3,344 3,325 — ( 132 ) 3,193 Other debt securities 63,271 1,592 ( 226 ) 64,637 37,608 819 ( 87 ) 38,340 Total $ 485,517 $ 6,522 $ ( 8,261 ) $ 483,778 $ 478,186 $ 8,897 $ ( 868 ) $ 486,215 Securities held-to-maturity: State and municipal securities $ 1,788 $ 59 $ — $ 1,847 $ 2,407 $ 97 $ — $ 2,504 Total $ 1,788 $ 59 $ — $ 1,847 $ 2,407 $ 97 $ — $ 2,504
Summary of Securities with Unrealized Losses and Length of Time Continuous Loss Positions	Securities with unrealized losses as of September 30, 2021 and December 31, 2020, 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 September 30, 2021 Estimated Gross Estimated Gross Estimated Gross U. S. government agency securities $ 2,931 $ ( 40 ) $ 1,964 $ ( 39 ) $ 4,895 $ ( 79 ) State and municipal securities 34,046 ( 546 ) 5,479 ( 234 ) 39,525 ( 780 ) Mortgage-backed securities 197,864 ( 5,773 ) 41,195 ( 1,403 ) 239,059 ( 7,176 ) Asset-backed securities — — — — — — Other debt securities 23,238 ( 226 ) — — 23,238 ( 226 ) Total temporarily impaired securities $ 258,079 $ ( 6,585 ) $ 48,638 $ ( 1,676 ) $ 306,717 $ ( 8,261 ) December 31, 2020 U. S. government agency securities $ 1,989 $ ( 25 ) $ — $ — $ 1,989 $ ( 25 ) State and municipal securities 10,463 ( 81 ) — — 10,463 ( 81 ) Mortgage-backed securities 100,291 ( 479 ) 1,449 ( 64 ) 101,740 ( 543 ) Asset-backed securities — — 3,193 ( 132 ) 3,193 ( 132 ) Other debt securities 6,103 ( 87 ) — — 6,103 ( 87 ) Total temporarily impaired securities $ 118,846 $ ( 672 ) $ 4,642 $ ( 196 ) $ 123,488 $ ( 868 )
Summary of Sales, Maturities, Prepayments and Calls of Securities	Results from sales, maturities, prepayments and calls of securities available for sale were as follows (in thousands): Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 Proceeds $ 74,305 $ 141,347 Gross gains 44 83 Gross losses ( 24 ) ( 9 )
Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	The amortized cost and fair value of securities at September 30, 2021, 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 Estimated Amortized Estimated Due in less than one year $ 17,820 $ 17,905 $ — $ — Due one to five years 73,699 75,446 1,788 1,847 Due five to ten years 55,125 56,249 — — Due beyond ten years 10,686 10,334 — — Mortgage-backed securities 324,862 320,500 — — Asset-backed securities 3,325 3,344 — — Total $ 485,517 $ 483,778 $ 1,788 $ 1,847

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Summary of Loans Held for Investment Portfolio	A summary of the loans held for investment portfolio as of September 30, 2021 and December 31, 2020 follows (in thousands): September 30, 2021 December 31, 2020 Commercial real estate $ 772,996 $ 643,832 Consumer real estate 328,262 343,791 Construction and land development 210,516 174,859 Commercial and industrial 478,279 623,446 Consumer 45,669 44,279 Other 58,527 53,483 Total 1,894,249 1,883,690 Allowance for loan losses ( 22,533 ) ( 23,245 ) Total loans, net $ 1,871,716 $ 1,860,445
Summary of Risk Category of Loans by Applicable Class of Loans	The following tables provides the risk category of loans by applicable class of loans as of September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Pass Special Substandard Doubtful Total Impaired Total Commercial real estate $ 748,967 $ 13,755 $ 4,960 $ — $ 1,154 $ 768,836 Consumer real estate 312,991 482 855 — 884 315,212 Construction and land development 207,617 2,844 11 — — 210,472 Commercial and industrial 451,180 10,194 14,382 26 63 475,845 Consumer 44,344 — 53 28 2 44,427 Other 58,107 — 79 — — 58,186 Purchased credit impaired 17,060 — 3,931 280 — 21,271 Total $ 1,840,266 $ 27,275 $ 24,271 $ 334 $ 2,103 $ 1,894,249 December 31, 2020 Commercial real estate $ 601,133 $ 33,046 $ 2,933 $ — $ 1,179 $ 638,291 Consumer real estate 323,072 1,375 1,122 — 1,707 327,276 Construction and land development 169,315 5,153 19 — 102 174,589 Commercial and industrial 568,767 25,855 25,666 — 168 620,456 Consumer 41,640 4 18 2 7 41,671 Other 52,949 — 66 — — 53,015 Purchased credit impaired 23,899 — 4,412 81 — 28,392 Total $ 1,780,775 $ 65,433 $ 34,236 $ 83 $ 3,163 $ 1,883,690
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 and nine month periods ended September 30, 2021 and 2020 (in thousands): Commercial Consumer Construction Commercial Consumer Other Total Three Months Ended September 30, 2021 Balance, beginning of period $ 7,915 $ 1,730 $ 3,871 $ 8,401 $ 356 $ 481 $ 22,754 Charged-off loans — — — ( 125 ) ( 62 ) ( 80 ) ( 267 ) Recoveries — 17 — 1 17 11 46 Provision for loan losses ( 521 ) 596 239 ( 664 ) 124 226 — Balance, end of period $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Three Months Ended September 30, 2020 Balance, beginning of period $ 5,139 $ 1,398 $ 2,387 $ 11,514 $ 234 $ 363 $ 21,035 Charged-off loans — — — — ( 30 ) ( 22 ) ( 52 ) Recoveries 13 1 — 3 16 32 65 Provision for loan losses 677 418 795 183 ( 20 ) 66 2,119 Balance, end of period $ 5,829 $ 1,817 $ 3,182 $ 11,700 $ 200 $ 439 $ 23,167 Commercial Consumer Construction Commercial Consumer Other Total Nine Months Ended September 30, 2021 Balance, beginning of period $ 7,349 $ 1,831 $ 3,476 $ 9,708 $ 305 $ 576 $ 23,245 Charged-off loans ( 10 ) ( 1 ) — ( 132 ) ( 106 ) ( 158 ) ( 407 ) Recoveries — 22 — 2 63 23 110 Provision for loan losses 55 491 634 ( 1,965 ) 173 197 ( 415 ) Balance, end of period $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Nine Months Ended September 30, 2020 Balance, beginning of period $ 3,599 $ 1,231 $ 2,058 $ 5,074 $ 222 $ 420 $ 12,604 Charged-off loans ( 3 ) ( 43 ) — ( 710 ) ( 83 ) ( 175 ) ( 1,014 ) Recoveries 10 4 — 162 58 48 282 Provision for loan losses 2,223 625 1,124 7,174 3 146 11,295 Balance, end of period $ 5,829 $ 1,817 $ 3,182 $ 11,700 $ 200 $ 439 $ 23,167 A breakdown of the ALL and the loan portfolio by loan category at September 30, 2021 and December 31, 2020 follows (in thousands): Commercial Consumer Construction Commercial Consumer Other Total September 30, 2021 Allowance for Loan Losses: Collectively evaluated for impairment $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Individually evaluated for impairment — — — — — — — Purchased credit impaired — — — — — — — Balances, end of period $ 7,394 $ 2,343 $ 4,110 $ 7,613 $ 435 $ 638 $ 22,533 Loans: Collectively evaluated for impairment $ 767,682 $ 314,328 $ 210,472 $ 475,782 $ 44,425 $ 58,186 $ 1,870,875 Individually evaluated for impairment 1,154 884 — 63 2 — 2,103 Purchased credit impaired 4,160 13,050 44 2,434 1,242 341 21,271 Balances, end of period $ 772,996 $ 328,262 $ 210,516 $ 478,279 $ 45,669 $ 58,527 $ 1,894,249 December 31, 2020 Allowance for Loan Losses: Collectively evaluated for impairment $ 7,349 1,831 3,410 9,708 305 576 $ 23,179 Individually evaluated for impairment — — 66 — — — 66 Purchased credit impaired — — — — — — — Balances, end of period $ 7,349 $ 1,831 $ 3,476 $ 9,708 $ 305 $ 576 $ 23,245 Loans: Collectively evaluated for impairment $ 637,112 $ 325,569 $ 174,487 $ 620,288 $ 41,664 $ 53,015 $ 1,852,135 Individually evaluated for impairment 1,179 1,707 102 168 7 — 3,163 Purchased credit impaired 5,541 16,515 270 2,990 2,608 468 28,392 Balances, end of period $ 643,832 $ 343,791 $ 174,859 $ 623,446 $ 44,279 $ 53,483 $ 1,883,690
Allocation of ALL with Corresponding Percentage of ALL in Each Category to Total Loans, Net of Deferred Fee Except PPP Loans	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 September 30, 2021 and December 31, 2020 (in thousands). PPP loans included in commercial and industrial loans in the below table do not have a corresponding ALL as they are fully guaranteed by the SBA: September 30, 2021 December 31, 2020 Amount Percent of total Amount Percent of total Commercial real estate $ 7,394 0.39 % $ 7,349 0.39 % Consumer real estate 2,343 0.12 1,831 0.10 Construction and land development 4,110 0.22 3,476 0.18 Commercial and industrial 7,613 0.41 9,708 0.51 Consumer 435 0.02 305 0.02 Other 638 0.03 576 0.03 Total allowance for loan losses $ 22,533 1.19 % $ 23,245 1.23 %
Summary of Impaired Loans	The following table presents the Company’s impaired loans that were evaluated for specific loss allowance, excluding purchased credit impaired (“PCI”) loans, as of September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 December 31, 2020 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate $ 1,154 $ 1,135 $ — $ 1,179 $ 1,176 $ — Consumer real estate 884 909 — 1,707 1,608 — Construction and land development — — — — — — Commercial and industrial 63 63 — 168 457 — Consumer 2 2 — 7 7 — Other — — — — — — Subtotal 2,103 2,109 — 3,061 3,248 — With an allowance recorded: Commercial real estate — — — — — — Consumer real estate — — — — — — Construction and land development — — — 102 102 66 Commercial and industrial — — — — — — Consumer — — — — — — Other — — — — — — Subtotal — — — 102 102 66 Total $ 2,103 $ 2,109 $ — $ 3,163 $ 3,350 $ 66 The following table presents information related to the average recorded investment and interest income recognized on impaired loans, excluding PCI loans, for the three and nine month periods ended September 30, 2021 and 2020 (in thousands): Three Months Ended Three Months Ended Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 Average Interest Average Interest Average Interest Average Interest With no related allowance recorded: Commercial real estate $ 1,159 $ 16 $ 1,191 $ 17 $ 1,174 $ 48 $ 1,458 $ 57 Consumer real estate 889 — 961 9 1,181 — 982 27 Construction and land development — — — — — — — — Commercial and industrial 63 — 90 — 64 1 176 2 Consumer 2 — 4 — 49 — 4 — Other — — — — — — — — Subtotal 2,113 16 2,246 26 2,468 49 2,620 86 With an allowance recorded: Commercial real estate — — — — — — — — Consumer real estate — — — — — — — — Construction and land development — — — — — — — — Commercial and industrial — — 107 — — — 108 — Consumer — — — — — — — — Other — — — — — — — — Subtotal — — 107 — — — 108 — Total $ 2,113 $ 16 $ 2,353 $ 26 $ 2,468 $ 49 $ 2,728 $ 86
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 September 30, 2021 and December 31, 2020 by class of loans (in thousands): 30 - 59 60 - 89 Greater Than Days Days 89 Days Total Loans Not Past Due Past Due Past Due Past Due Past Due Total September 30, 2021 Commercial real estate $ 65 $ — $ 1,257 1,322 $ 767,514 $ 768,836 Consumer real estate 425 496 187 1,108 314,104 315,212 Construction and land development 30 — 12 42 210,430 210,472 Commercial and industrial 437 503 45 985 474,860 475,845 Consumer 160 99 38 297 44,130 44,427 Other 78 316 — 394 57,792 58,186 Purchased credit impaired 932 79 794 1,805 19,466 21,271 Total $ 2,127 $ 1,493 $ 2,333 $ 5,953 $ 1,888,296 $ 1,894,249 December 31, 2020 Commercial real estate $ 409 $ — $ 1,176 $ 1,585 $ 636,706 $ 638,291 Consumer real estate 6,084 1,596 687 8,367 318,909 327,276 Construction and land development 2,670 745 — 3,415 171,174 174,589 Commercial and industrial 1,734 38 1,595 3,367 617,089 620,456 Consumer 270 40 7 317 41,354 41,671 Other 252 38 — 290 52,725 53,015 Purchased credit impaired 1,372 1,554 901 3,827 24,565 28,392 Total $ 12,791 $ 4,011 $ 4,366 $ 21,168 $ 1,862,522 $ 1,883,690
Schedule of Non-Accrual Loans, Past Due Loans over 89 Days and Accruing and Troubled Debt Restructurings (TDR) by Class of Loans	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 September 30, 2021 and December 31, 2020 (in thousands): Non-Accrual Past Due Over 89 Days and Accruing Troubled Debt Restructurings September 30, 2021 Commercial real estate $ 115 $ 1,257 $ 1,135 Consumer real estate 1,174 77 661 Construction and land development — 12 — Commercial and industrial 89 45 63 Consumer 47 — — Other — — — Purchased credit impaired 2,006 169 — Total $ 3,431 $ 1,560 $ 1,859 December 31, 2020 Commercial real estate $ 130 $ 1,176 $ 1,176 Consumer real estate 1,821 342 685 Construction and land development 107 — — Commercial and industrial 470 1,205 67 Consumer 9 5 — Other — — — Purchased credit impaired 2,279 567 — Total $ 4,816 $ 3,295 $ 1,928
Summary of Contractually Required Payments for FCB and BOW Mergers Expected at Acquisition Date	The following table relates to acquired FCB and BOW PCI loans and summarizes the contractually required payments, which includes principal and interest, expected cash flows to be collected, and the fair value of acquired PCI loans at the acquisition date (in thousands): FCB and BOW acquisitions on July 1, 2020 Contractually required payments $ 42,443 Nonaccretable difference 4,501 Cash flows expected to be collected at acquisition 37,942 Accretable yield 4,349 Fair value of PCI loans at acquisition date $ 33,593
Summary of Contractually Required Payments for FCB and BOW Mergers Not Expected at Acquisition Date	The following table relates to purchased non-impaired loans acquired and provides the contractually required payments, fair value, and estimate of contractual cash flows not expected to be collected at the acquisition date (in thousands): FCB and BOW acquisitions on July 1, 2020 Contractually required payments $ 296,527 Fair value of acquired loans at acquisition date 260,701 Contractual cash flows not expected to be collected 3,718
Schedule of Activity in Purchased Credit Impaired Loans	The following table presents changes in the carrying value of PCI loans (in thousands) for the periods indicated: Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Balance at beginning of period $ 22,765 $ 28,392 Change due to payments received and accretion ( 1,494 ) ( 7,121 ) Balance at end of period $ 21,271 $ 21,271 The following table presents changes in the accretable yield for PCI loans (in thousands) for the periods indicated: Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Balance at beginning of period $ 3,169 $ 4,068 Accretion ( 603 ) ( 1,502 ) Balance at end of period $ 2,566 $ 2,566

Premises and Equipment (Tables)

Premises and Equipment (Tables)	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Summary of Lease Costs	Lease costs were as follows (in thousands): Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Operating lease cost $ 514 $ 1,588 Short-term lease cost — — Variable lease cost — — Total lease cost $ 514 $ 1,588
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): September 30, 2021 Lease payments due: 2021 $ 432 2022 1,751 2023 1,717 2024 1,425 2025 1,428 2026 and thereafter 7,655 Total undiscounted cash flows 14,408 Discount on cash flows ( 2,181 ) Total lease liability $ 12,227

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 and 2020 (in thousands): Unrealized Gains Gains and and Losses Losses on on Available Cash Flow for Sale Hedges Securities Total Nine Months Ended September 30, 2021 Beginning balance $ — $ 7,728 $ 7,728 Other comprehensive loss before — ( 7,214 ) ( 7,214 ) Amounts reclassified from accumulated other — ( 15 ) ( 15 ) Net current period other comprehensive loss — ( 7,229 ) ( 7,229 ) Ending Balance $ — $ 499 $ 499 Nine Months Ended September 30, 2020 Beginning balance $ ( 2,679 ) $ 4,062 $ 1,383 Other comprehensive income before — 2,797 2,797 Amounts reclassified from accumulated other 2,679 ( 55 ) 2,624 Net current period other comprehensive income 2,679 2,742 5,421 Ending Balance $ — $ 6,804 $ 6,804
Summary of Amounts Reclassified out off Accumulated Other Comprehensive Income (Loss)	The following amounts were reclassified out of each component of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2021 and 2020 (in thousands): Affected Line Item Details about Accumulated Other Three Months Ended September 30, Nine Months Ended September 30, in the Statement Where Comprehensive Income (Loss) Components 2021 2020 2021 2020 Net Income is Presented Realized losses on cash flow hedges $ — $ ( 2,060 ) $ — $ ( 2,466 ) Interest expense - money market accounts — ( 107 ) — ( 213 ) Interest expense - Federal Home Loan Bank advances — — — — Income tax benefit (expense) $ — $ ( 2,167 ) $ — $ ( 2,679 ) Net of tax Realized gains on available- $ 7 $ 34 $ 20 $ 74 Net gain on sale of securities ( 2 ) ( 9 ) ( 5 ) ( 19 ) Income tax expense $ 5 $ 25 $ 15 $ 55 Net of tax

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 (in thousands): Contract or notional amount September 30, 2021 December 31, 2020 Financial instruments whose contract amounts represent Unused commitments to extend credit $ 806,444 $ 804,520 Standby letters of credit 10,397 10,403 Total $ 816,841 $ 814,923

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Customer Related Interest Rate Swaps	A summary of the Company’s customer related interest rate swaps was as follows (in thousands): September 30, 2021 December 31, 2020 Notional Estimated Notional Estimated amount fair value amount fair value Interest rate swap agreements: Pay fixed/receive variable swaps $ 58,040 $ ( 2,118 ) $ 59,946 $ ( 2,740 ) Pay variable/receive fixed swaps 58,040 2,118 59,946 2,740 Total $ 116,080 $ — $ 119,892 $ —
Summary of Net (Losses) Gains Relating to Mortgage Banking Derivative Instruments Included in Mortgage Banking Income	The net (losses) gains relating to mortgage banking derivative instruments included in mortgage banking income were as follows (in thousands): Three Months Ended Nine Months Ended September 30, 2021 September 30, 2021 Mortgage loan interest rate lock commitments $ ( 221 ) $ ( 1,528 ) Mortgage-backed securities forward sales commitments 307 919 Total $ 86 $ ( 609 )
Summary of Amount and Fair Value of Mortgage Banking Derivative Instruments Included in Consolidated Balance Sheets	The amount and fair value of mortgage banking derivatives included in the consolidated balance sheets were as follows (in thousands): September 30, 2021 December 31, 2020 Notional Estimated Notional Estimated amount fair value amount fair value Included in other assets: Mortgage loan interest rate lock commitments $ 86,938 $ 1,079 $ 88,303 $ 2,607 Mortgage-backed securities forward sales commitments 72,500 293 — — Included in other liabilities: Mortgage-backed securities forward sales commitments $ — $ — $ 87,000 $ ( 626 )

Stock Options and Restricted _2

Stock Options and Restricted Shares (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Company Recognized Stock-Based Compensation Expense	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 Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Stock-based compensation expense before income taxes $ 373 $ 330 $ 1,169 $ 1,231 Less: deferred tax benefit ( 98 ) ( 86 ) ( 306 ) ( 322 ) Reduction of net income $ 275 $ 244 $ 863 $ 909
Summary of Changes in Company's Nonvested Restricted Shares	A summary of the changes in the Company’s nonvested restricted shares for the nine months ended September 30, 2021 follows: Weighted Average Restricted Grant Date Nonvested Shares Shares Fair Value Nonvested at beginning of period 148,414 $ 14.39 Granted 140,549 14.81 Vested ( 64,062 ) 14.99 Forfeited ( 23,222 ) 14.52 Nonvested at end of period 201,679 $ 14.10
Summary of Activity in Stock Options	A summary of the activity in stock options for the nine months ended September 30, 2021 follows: Weighted Weighted Average Average Remaining Exercise Contractual Shares Price Term (years) Outstanding at beginning of period 226,589 $ 11.73 Granted — — Exercised ( 96,344 ) 11.41 Forfeited or expired — — Outstanding at end of period 130,245 $ 11.96 5.2 Fully vested and expected to vest 130,245 $ 11.96 5.2 Exercisable at end of period 113,578 $ 11.54 4.8
Information Related to Stock Options	Information related to stock options during each year follows: 2021 2020 Intrinsic value of options exercised $ 821,174 $ 188,662 Cash received from option exercises 1,077,489 105,847 Tax benefit realized from option exercises 148,312 16,524 Weighted average fair value of options granted — —

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Interest [Abstract]
Schedule of Capital Amounts and Ratios	The Company’s and the Bank’s capital amounts and ratios as of September 30, 2021 and December 31, 2020 are presented in the following table (dollars in thousands). Actual Minimum capital Minimum to be Amount Ratio Amount Ratio Amount Ratio At September 30, 2021: Total capital to risk-weighted assets: CapStar Financial Holdings, Inc. $ 373,051 16.23 % $ 183,922 8.0 % N/A N/A CapStar Bank 359,460 15.65 183,781 8.0 $ 229,726 10 % Tier I capital to risk-weighted assets: CapStar Financial Holdings, Inc. 320,700 13.95 137,941 6.0 N/A N/A CapStar Bank 336,608 14.65 137,835 6.0 183,781 8.00 Common equity Tier 1 capital to risk weighted CapStar Financial Holdings, Inc. 320,700 13.95 103,456 4.5 N/A N/A CapStar Bank 320,108 13.93 103,377 4.5 149,322 6.50 Tier I capital to average assets: CapStar Financial Holdings, Inc. 320,700 10.28 124,771 4.0 N/A N/A CapStar Bank 336,608 10.82 124,449 4.0 155,561 5.00 At December 31, 2020: Total capital to risk-weighted assets: CapStar Financial Holdings, Inc. $ 338,426 16.03 % $ 168,910 8.0 % N/A N/A CapStar Bank 324,152 15.36 168,808 8.0 $ 211,010 10.0 Tier I capital to risk-weighted assets: CapStar Financial Holdings, Inc. 285,439 13.52 126,682 6.0 N/A N/A CapStar Bank 300,588 14.25 126,606 6.0 168,808 8.0 Common equity Tier 1 capital to risk weighted CapStar Financial Holdings, Inc. 285,439 13.52 95,012 4.5 N/A N/A CapStar Bank 284,088 13.46 94,954 4.5 137,156 6.5 Tier I capital to average assets: CapStar Financial Holdings, Inc. 285,439 9.60 118,877 4.0 N/A N/A CapStar Bank 300,588 10.12 118,780 4.0 148,476 5.0 (1) For the calendar year 2021, 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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Summary of Basic and Diluted Earnings Per Share	The following is a summary of the basic and diluted earnings per share calculation for the three and nine month periods ended September 30, 2021 and 2020 (in thousands except share and per share data): Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Basic net income per share calculation: Numerator – Net income $ 13,102 $ 7,487 $ 36,207 $ 15,015 Denominator – Average common shares outstanding 22,164,278 21,948,579 22,114,948 19,558,281 Basic net income per share $ 0.59 $ 0.34 $ 1.64 $ 0.77 Diluted net income per share calculation: Numerator – Net income $ 13,102 $ 7,487 $ 36,207 $ 15,015 Denominator – Average common shares outstanding 22,164,278 21,948,579 22,114,948 19,558,281 Dilutive shares contingently issuable 54,124 11,911 50,182 25,167 Average diluted common shares outstanding 22,218,402 21,960,490 22,165,130 19,583,448 Diluted net income per share $ 0.59 $ 0.34 $ 1.63 $ 0.77

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 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 agency securities $ 11,610 $ — $ 11,610 $ — State and municipal securities 83,687 — 83,687 — Mortgage-backed securities 320,500 — 320,500 — Asset-backed securities 3,344 — 3,344 — Other debt securities 64,637 — 64,637 — Loans held for sale 79,842 — 79,842 — Derivative assets: Non-hedging derivatives: Interest rate swaps - customer related 2,118 — 2,118 — Mortgage loan interest rate lock commitments 1,079 — — 1,079 Mortgage-backed securities forward sales commitments 293 — 293 — Liabilities: Derivative liabilities: Non-hedging derivatives: Derivative Liabilities - customer related ( 2,118 ) — ( 2,118 ) — Fair value measurements at December 31, 2020 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 agency securities $ 16,391 $ — $ 16,391 $ — State and municipal securities 91,928 — 91,928 — Mortgage-backed securities 336,363 — 336,363 — Asset-backed securities 3,193 — 3,193 — Other debt securities 38,340 — 38,340 — Loans held for sale 97,303 — 97,303 — Derivative assets: Non-hedging derivatives: Interest rate swaps - customer related 2,740 — 2,740 — Mortgage loan interest rate lock commitments 2,607 — — 2,607 Liabilities: Derivative liabilities: Non-hedging derivatives: Interest rate swaps - customer related ( 2,740 ) — ( 2,740 ) — Mortgage-backed securities forward sales commitments ( 626 ) — ( 626 ) —
Reconciliation of Assets Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Level 3)	The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30, 2021 and 2020 (in thousands): Mortgage Loan Interest Rate Lock Commitments 2021 2020 Balance of recurring Level 3 assets at January 1st $ 2,607 $ 648 Total gains or losses for the period: Included in mortgage banking income ( 1,528 ) 3,488 Balance of recurring Level 3 assets at September 30th $ 1,079 $ 4,136
Summary of Quantitative Information About Level 3 Fair Value Measurements for Assets Measured at Fair Value on Recurring and Non-recurring Basis	The following table presents quantitative information about recurring Level 3 fair value measurements (dollars in thousands): Range Fair Valuation (Weighted- September 30, 2021 Value Technique(s) Unobservable Input(s) Average) Assets: Non-hedging derivatives: Mortgage loan interest rate lock commitments $ 1,079 Consensus pricing Origination pull-through rate 59 % - 96 % ( 82 %) Range Fair Valuation (Weighted- December 31, 2020 Value Technique(s) Unobservable Input(s) Average) Assets: Non-hedging derivatives: Mortgage loan interest rate lock commitments $ 2,607 Consensus pricing Origination pull-through rate 54 % - 91 % ( 74 %) The following table presents quantitative information about December 31, 2020 Level 3 fair value measurements for assets measured at fair value on a non-recurring basis (dollars in thousands): Range Fair Valuation (Weighted- December 31, 2020 Value Technique(s) Unobservable Input(s) Average) Impaired loans: Commercial and industrial $ 36 Sales Comparison approach Appraisal discounts 10 %
Summary of Assets Measured at Fair Value on a Nonrecurring Basis	There were no assets measured at fair value on a nonrecurring basis as of September 30, 2021. Assets measured at fair value on a nonrecurring basis as of December 31, 2020 are summarized below (in thousands). Fair value measurements at December 31, 2020 Quoted prices in active Significant markets for other Significant identical observable unobservable Carrying assets inputs inputs Value (level 1) (level 2) (level 3) Assets: Impaired loans: Commercial and industrial $ 36 — — 36
Summary of Carrying Value and Fair Values of the Bank's Financial Instruments	Fair Value of Financial Instruments The carrying value and estimated fair values of the Bank’s financial instruments at September 30, 2021 and December 31, 2020 were as follows (in thousands): September 30, 2021 December 31, 2020 Carrying Carrying Fair value amount Fair value amount Fair value level of input Financial assets: Cash and due from banks, interest-bearing deposits in $ 339,367 $ 339,367 $ 277,439 $ 277,439 Level 1 Federal funds sold 19,900 19,900 — — Level 1 Securities available-for-sale 483,778 483,778 486,215 486,215 Level 2 Securities held-to-maturity 1,788 1,847 2,407 2,504 Level 2 Loans held for sale 176,488 179,325 186,998 180,698 Level 2 Restricted equity securities 14,443 N/A 15,562 N/A N/A Loans held for investment 1,894,249 1,901,826 1,883,690 1,900,647 Level 3 Accrued interest receivable 7,606 7,606 8,771 8,771 Level 2 Other assets 83,072 83,072 46,381 46,381 Level 2 / Level 3 Financial liabilities: Deposits 2,674,392 2,535,324 2,568,001 2,472,860 Level 3 Subordinated notes and Federal Home Loan bank advances 29,499 31,022 39,423 41,400 Level 2 Other liabilities 2,902 2,902 3,334 3,334 Level 3

Acquisition - Additional Inform

Acquisition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Acquisition related expenses		$ 0	$ 2,548	$ 323	$ 3,286
Goodwill		$ 41,068		$ 41,068		$ 41,068
FCB Merger
Business Acquisition [Line Items]
Common stock, par value	$ 1
Common stock shares	2,966,918
Stock Issued During Period, Value, Issued for Services	$ 22,200
Bow Merger
Business Acquisition [Line Items]
Common stock shares	664,800
Stock Issued During Period, Value, Issued for Services	$ 5,100
Total acquisition consideration	70,900
FCB Corporation and BOW
Business Acquisition [Line Items]
Acquisition related expenses			$ 2,500		$ 3,300
Goodwill	$ 3,558
FCB Common Stock | FCB Merger
Business Acquisition [Line Items]
Common stock, par value	$ 10
BOW Common Stock | Bow Merger
Business Acquisition [Line Items]
Common stock, par value	$ 10

Acquisition - Schedule of Consi

Acquisition - Schedule of Consideration Paid and Amounts of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		Jul. 01, 2020	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Total cost of acquisition
Payments to Acquire Businesses, Gross			$ 27,278
Goodwill recorded related to acquisition				$ 41,068	$ 41,068
FCB Corporation and BOW
Assets
Cash and cash equivalents		$ 90,760
Securities		98,695
Loans, gross		294,674
Premises and equipment, net		11,447
Core deposit intangible		3,570
Other		15,597
Total		514,743
Liabilities
Deposits		442,677
Other		4,735
Total		447,412
Net identifiable assets acquired		67,331
Total cost of acquisition
Value of stock issued		70,889
Total cost of acquisition		70,889
Goodwill recorded related to acquisition		3,558
FCB Corporation and BOW | As recorded by FCB Corporation and BOW
Assets
Cash and cash equivalents		90,760
Securities		98,536
Loans, gross		296,992
Allowance for loan losses		(4,544)
Premises and equipment, net		9,907
Other		16,514
Total		508,165
Liabilities
Deposits		440,025
Other		4,735
Total		444,760
FCB Corporation and BOW | Initial Fair Value Adjustment
Assets
Securities	[1]	159
Loans, gross	[2]	(2,318)
Allowance for loan losses	[3]	4,544
Premises and equipment, net	[4]	1,540
Core deposit intangible	[5]	3,570
Other	[6]	917
Total		6,578
Liabilities
Deposits	[7]	2,652
Total		2,652
FCB Corporation and BOW | Common Stock
Total cost of acquisition
Value of stock issued		43,611
Total cost of acquisition		43,611
FCB Corporation and BOW | Rolled Stock Options
Total cost of acquisition
Cash consideration paid		$ 27,278
[1]	The amount represents the fair value adjustment of acquired securities that were subsequently sold.
[2]	The amount represents the adjustment of the net book value of acquired loans to their estimated fair value based on interest rates and expected cash flows at the date of acquisition.
[3]	The amount represents the removal of FCB’s and BOW’s existing allowance for loan losses.
[4]	The amount represents the adjustment of the net book value of acquired premises and equipment to their estimated fair value.
[5]	The amount represents the adjustment of recording the fair value of the core deposit intangible representing the intangible value of the deposit base acquired and the fair value of the customer relationship.
[6]	The amount represents the net adjustment of the deferred tax asset recognized on the fair value adjustments on acquired assets and assumed liabilities.
[7]	The amount represents the adjustment necessary because the weighted average interest rate of acquired time deposits exceeded

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities available for sale [Abstract]
Amortized Cost	$ 485,517	$ 478,186
Gross unrealized gains	6,522	8,897
Gross unrealized (losses)	(8,261)	(868)
Estimated fair value	483,778	486,215
Securities held to maturity [Abstract]
Amortized Cost	1,788	2,407
Gross unrealized gains	59	97
Estimated fair value	1,847	2,504
U. S. government agency securities
Securities available for sale [Abstract]
Amortized Cost	11,588	16,158
Gross unrealized gains	101	258
Gross unrealized (losses)	(79)	(25)
Estimated fair value	11,610	16,391
State and municipal securities
Securities available for sale [Abstract]
Amortized Cost	82,471	89,081
Gross unrealized gains	1,996	2,928
Gross unrealized (losses)	(780)	(81)
Estimated fair value	83,687	91,928
Securities held to maturity [Abstract]
Amortized Cost	1,788	2,407
Gross unrealized gains	59	97
Estimated fair value	1,847	2,504
Mortgage-backed securities
Securities available for sale [Abstract]
Amortized Cost	324,862	332,014
Gross unrealized gains	2,814	4,892
Gross unrealized (losses)	(7,176)	(543)
Estimated fair value	320,500	336,363
Asset-backed securities
Securities available for sale [Abstract]
Amortized Cost	3,325	3,325
Gross unrealized gains	19
Gross unrealized (losses)		(132)
Estimated fair value	3,344	3,193
Other debt securities
Securities available for sale [Abstract]
Amortized Cost	63,271	37,608
Gross unrealized gains	1,592	819
Gross unrealized (losses)	(226)	(87)
Estimated fair value	$ 64,637	$ 38,340

Securities - Summary of Securit

Securities - Summary of Securities with Unrealized Losses and Length of Time Continuous Loss Positions (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Estimated fair value	$ 258,079	$ 118,846
Less than 12 months, Gross unrealized losses	(6,585)	(672)
12 months or more, Estimated fair value	48,638	4,642
12 months or more, Gross unrealized losses	(1,676)	(196)
Total, Estimated fair value	306,717	123,488
Total, Gross unrealized losses	(8,261)	(868)
U. S. government agency securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Estimated fair value	2,931	1,989
Less than 12 months, Gross unrealized losses	(40)	(25)
12 months or more, Estimated fair value	1,964
12 months or more, Gross unrealized losses	(39)
Total, Estimated fair value	4,895	1,989
Total, Gross unrealized losses	(79)	(25)
State and municipal securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Estimated fair value	34,046	10,463
Less than 12 months, Gross unrealized losses	(546)	(81)
12 months or more, Estimated fair value	5,479
12 months or more, Gross unrealized losses	(234)
Total, Estimated fair value	39,525	10,463
Total, Gross unrealized losses	(780)	(81)
Mortgage-backed securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Estimated fair value	197,864	100,291
Less than 12 months, Gross unrealized losses	(5,773)	(479)
12 months or more, Estimated fair value	41,195	1,449
12 months or more, Gross unrealized losses	(1,403)	(64)
Total, Estimated fair value	239,059	101,740
Total, Gross unrealized losses	(7,176)	(543)
Asset-backed securities
Schedule Of Available For Sale Securities [Line Items]
12 months or more, Estimated fair value		3,193
12 months or more, Gross unrealized losses		(132)
Total, Estimated fair value		3,193
Total, Gross unrealized losses		(132)
Other debt securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Estimated fair value	23,238	6,103
Less than 12 months, Gross unrealized losses	(226)	(87)
Total, Estimated fair value	23,238	6,103
Total, Gross unrealized losses	$ (226)	$ (87)

Securities - Additional Informa

Securities - Additional Information (Details) $ in Millions	Sep. 30, 2021USD ($)
Schedule Of Available For Sale Securities [Line Items]
Gross unrealized losses in investment securities portfolio	$ 8.3
Public Deposits, Derivative Positions and Federal Home Loan Bank Advances
Schedule Of Available For Sale Securities [Line Items]
Market value of securities	$ 201.5

Securities - Summary of Sales,

Securities - Summary of Sales, Maturities, Prepayments and Calls of Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 74,305	$ 141,347
Gross gains	44	83
Gross losses	$ (24)	$ (9)

Securities - Summary of Amort_2

Securities - Summary of Amortized Cost and Fair Value of Debt and Equity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale, Amortized cost [Abstract]
Due in less than one year	$ 17,820
Due one to five years	73,699
Due five to ten years	55,125
Due beyond ten years	10,686
Amortized Cost	485,517	$ 478,186
Available-for-sale, Estimated fair value [Abstract]
Due in less than one year	17,905
Due one to five years	75,446
Due five to ten years	56,249
Due beyond ten years	10,334
Estimated fair value	483,778	486,215
Held-to-maturity, Amortized cost [Abstract]
Due in less than one year	0
Due one to five years	1,788
Amortized Cost	1,788	2,407
Securities held to maturity [Abstract]
Due in less than one year	0
Due one to five years	1,847
Estimated fair value	1,847	2,504
Mortgage-backed securities
Available-for-sale, Amortized cost [Abstract]
Amortized cost	324,862
Amortized Cost	324,862	332,014
Available-for-sale, Estimated fair value [Abstract]
Estimated fair value	320,500
Estimated fair value	320,500	336,363
Asset-backed securities
Available-for-sale, Amortized cost [Abstract]
Amortized Cost	3,325	3,325
Available-for-sale, Estimated fair value [Abstract]
Estimated fair value	$ 3,344	$ 3,193

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Summary of Loans Held for Investment Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans And Leases Receivable Disclosure [Line Items]
Total loans	$ 1,894,249		$ 1,883,690
Allowance for loan losses	(22,533)	$ (22,754)	(23,245)	$ (23,167)	$ (21,035)	$ (12,604)
Loans, net	1,871,716		1,860,445
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Total loans	772,996		643,832
Allowance for loan losses	(7,394)	(7,915)	(7,349)	(5,829)	(5,139)	(3,599)
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Total loans	328,262		343,791
Allowance for loan losses	(2,343)	(1,730)	(1,831)	(1,817)	(1,398)	(1,231)
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Total loans	210,516		174,859
Allowance for loan losses	(4,110)	(3,871)	(3,476)	(3,182)	(2,387)	(2,058)
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Total loans	478,279		623,446
Allowance for loan losses	(7,613)	(8,401)	(9,708)	(11,700)	(11,514)	(5,074)
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Total loans	45,669		44,279
Allowance for loan losses	(435)	(356)	(305)	(200)	(234)	(222)
Other
Loans And Leases Receivable Disclosure [Line Items]
Total loans	58,527		53,483
Allowance for loan losses	$ (638)	$ (481)	$ (576)	$ (439)	$ (363)	$ (420)

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)Contract	Sep. 30, 2020USD ($)Contract	Sep. 30, 2021USD ($)Contract	Sep. 30, 2020USD ($)Contract	Dec. 31, 2020USD ($)	Jul. 01, 2020USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Outstanding balance of loans originated under PPP	$ 1,871,716,000		$ 1,871,716,000		$ 1,860,445,000
Minimum loan amount for loans analyzed by credit risk			500,000
Interest income recognized on a cash basis for impaired loans	0
Investment in TDR	1,900,000		1,900,000		1,900,000
Specific allowance related to loans	0		0		66,000
Additional commitments related to TDR	$ 0		$ 0		0
New TDR identified during the period | Contract	0	0	0	0
TDR, payment default within twelve months | Contract	0	0	0	0
Loan period considered as payment default			30 days
Recorded loans with a fair value						$ 294,700,000
Purchased Credit Impaired
Loans And Leases Receivable Disclosure [Line Items]
Recorded loans with a fair value						$ 33,600,000
Troubled Debt Restructurings
Loans And Leases Receivable Disclosure [Line Items]
Specific allowance related to loans	$ 0		$ 0		0
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Specific allowance related to loans	$ 0		$ 0
Payroll Protection Program
Loans And Leases Receivable Disclosure [Line Items]
Debt instrument, interest rate	1.00%		1.00%
Unamortized fees	$ 2,200,000		$ 2,200,000
Fees recognized as income	$ 1,700,000	$ 1,000,000	$ 5,600,000	$ 1,900,000
Payroll Protection Program | Minimum
Loans And Leases Receivable Disclosure [Line Items]
Debt instrument, term			2 years
Percentage of loan processing fee	1.00%		1.00%
Payroll Protection Program | Maximum
Loans And Leases Receivable Disclosure [Line Items]
Debt instrument, term			5 years
Percentage of loan processing fee	5.00%		5.00%
Payroll Protection Program | Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Outstanding balance of loans originated under PPP	$ 64,200,000		$ 64,200,000		$ 185,500,000

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Summary of Risk Category of Loans by Applicable Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment [Line Items]
Purchased credit impaired	$ 21,271	$ 28,392
Total loans	1,894,249	1,883,690
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	768,836	638,291
Purchased credit impaired	4,160	5,541
Total loans	772,996	643,832
Consumer real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	315,212	327,276
Purchased credit impaired	13,050	16,515
Total loans	328,262	343,791
Construction and land development
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	210,472	174,589
Purchased credit impaired	44	270
Total loans	210,516	174,859
Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	475,845	620,456
Purchased credit impaired	2,434	2,990
Total loans	478,279	623,446
Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	44,427	41,671
Purchased credit impaired	1,242	2,608
Total loans	45,669	44,279
Other
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	58,186	53,015
Purchased credit impaired	341	468
Total loans	58,527	53,483
Purchased credit impaired
Financing Receivable Recorded Investment [Line Items]
Purchased credit impaired	21,271	28,392
Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	2,103	3,163
Total Impaired Loans | Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	1,154	1,179
Total Impaired Loans | Consumer real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	884	1,707
Total Impaired Loans | Construction and land development
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired		102
Total Impaired Loans | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	63	168
Total Impaired Loans | Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	2	7
Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	1,840,266	1,780,775
Performing Financial Instruments | Pass | Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	748,967	601,133
Performing Financial Instruments | Pass | Consumer real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	312,991	323,072
Performing Financial Instruments | Pass | Construction and land development
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	207,617	169,315
Performing Financial Instruments | Pass | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	451,180	568,767
Performing Financial Instruments | Pass | Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	44,344	41,640
Performing Financial Instruments | Pass | Other
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	58,107	52,949
Performing Financial Instruments | Pass | Purchased credit impaired
Financing Receivable Recorded Investment [Line Items]
Purchased credit impaired	17,060	23,899
Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	27,275	65,433
Performing Financial Instruments | Special Mention | Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	13,755	33,046
Performing Financial Instruments | Special Mention | Consumer real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	482	1,375
Performing Financial Instruments | Special Mention | Construction and land development
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	2,844	5,153
Performing Financial Instruments | Special Mention | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	10,194	25,855
Performing Financial Instruments | Special Mention | Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired		4
Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	24,271	34,236
Performing Financial Instruments | Substandard | Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	4,960	2,933
Performing Financial Instruments | Substandard | Consumer real estate
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	855	1,122
Performing Financial Instruments | Substandard | Construction and land development
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	11	19
Performing Financial Instruments | Substandard | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	14,382	25,666
Performing Financial Instruments | Substandard | Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	53	18
Performing Financial Instruments | Substandard | Other
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	79	66
Performing Financial Instruments | Substandard | Purchased credit impaired
Financing Receivable Recorded Investment [Line Items]
Purchased credit impaired	3,931	4,412
Performing Financial Instruments | Doubtful
Financing Receivable Recorded Investment [Line Items]
Total loans	334	83
Performing Financial Instruments | Doubtful | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	26
Performing Financial Instruments | Doubtful | Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans excluding purchased credit impaired	28	2
Performing Financial Instruments | Doubtful | Purchased credit impaired
Financing Receivable Recorded Investment [Line Items]
Purchased credit impaired	$ 280	$ 81

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Summary of Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 22,754	$ 21,035	$ 23,245	$ 12,604
Charged-off loans	(267)	(52)	(407)	(1,014)
Recoveries	46	65	110	282
Provision for loan losses	0	2,119	(415)	11,295
Ending Balance	22,533	23,167	22,533	23,167
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	7,915	5,139	7,349	3,599
Charged-off loans	0		(10)	(3)
Recoveries		13
Provision for loan losses	(521)	677	55	2,223
Ending Balance	7,394	5,829	7,394	5,829
Consumer real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,730	1,398	1,831	1,231
Charged-off loans		0	(1)	(43)
Recoveries	17	1	22	4
Provision for loan losses	596	418	491	625
Ending Balance	2,343	1,817	2,343	1,817
Construction and land development
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,871	2,387	3,476	2,058
Charged-off loans			0
Provision for loan losses	239	(795)	634	1,124
Ending Balance	4,110	3,182	4,110	3,182
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,401	11,514	9,708	5,074
Charged-off loans	(125)	0	(132)	(710)
Recoveries	1	3	2	162
Provision for loan losses	(664)	183	(1,965)	7,174
Ending Balance	7,613	11,700	7,613	11,700
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	356	234	305	222
Charged-off loans	(62)	(30)	(106)	(83)
Recoveries	17	16	63	58
Provision for loan losses	124	20	173	3
Ending Balance	435	200	435	200
Other
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	481	363	576	420
Charged-off loans	(80)	(22)	(158)	(175)
Recoveries	11	32	23	48
Provision for loan losses	226	66	197	146
Ending Balance	$ 638	$ 439	$ 638	$ 439

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Summary of Breakdown of Allowance for Loan Losses and Loan Portfolio by Loan Category (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Allowance for Loan Losses:
Collectively evaluated for impairment	$ 22,533		$ 23,179
Individually evaluated for impairment	0		66
Allowance for Loan Losses, Ending Balance	22,533	$ 22,754	23,245	$ 23,167	$ 21,035	$ 12,604
Loans:
Collectively evaluated for impairment	1,870,875		1,852,135
Individually evaluated for impairment	2,103		3,163
Purchased credit impaired	21,271		28,392
Total	1,894,249		1,883,690
Commercial real estate
Allowance for Loan Losses:
Collectively evaluated for impairment	7,394		7,349
Allowance for Loan Losses, Ending Balance	7,394	7,915	7,349	5,829	5,139	3,599
Loans:
Collectively evaluated for impairment	767,682		637,112
Individually evaluated for impairment	1,154		1,179
Purchased credit impaired	4,160		5,541
Total	772,996		643,832
Consumer real estate
Allowance for Loan Losses:
Collectively evaluated for impairment	2,343		1,831
Allowance for Loan Losses, Ending Balance	2,343	1,730	1,831	1,817	1,398	1,231
Loans:
Collectively evaluated for impairment	314,328		325,569
Individually evaluated for impairment	884		1,707
Purchased credit impaired	13,050		16,515
Total	328,262		343,791
Construction and land development
Allowance for Loan Losses:
Collectively evaluated for impairment	4,110		3,410
Individually evaluated for impairment			66
Allowance for Loan Losses, Ending Balance	4,110	3,871	3,476	3,182	2,387	2,058
Loans:
Collectively evaluated for impairment	210,472		174,487
Individually evaluated for impairment			102
Purchased credit impaired	44		270
Total	210,516		174,859
Commercial and industrial
Allowance for Loan Losses:
Collectively evaluated for impairment	7,613		9,708
Individually evaluated for impairment	0
Allowance for Loan Losses, Ending Balance	7,613	8,401	9,708	11,700	11,514	5,074
Loans:
Collectively evaluated for impairment	475,782		620,288
Individually evaluated for impairment	63		168
Purchased credit impaired	2,434		2,990
Total	478,279		623,446
Consumer
Allowance for Loan Losses:
Collectively evaluated for impairment	435		305
Allowance for Loan Losses, Ending Balance	435	356	305	200	234	222
Loans:
Collectively evaluated for impairment	44,425		41,664
Individually evaluated for impairment	2		7
Purchased credit impaired	1,242		2,608
Total	45,669		44,279
Other
Allowance for Loan Losses:
Collectively evaluated for impairment	638		576
Allowance for Loan Losses, Ending Balance	638	$ 481	576	$ 439	$ 363	$ 420
Loans:
Collectively evaluated for impairment	58,186		53,015
Purchased credit impaired	341		468
Total	$ 58,527		$ 53,483

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Allocation of ALL with Corresponding Percentage of ALL in Each Category to Total Loans, Net of Deferred Fee Except PPP Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 22,533	$ 22,754	$ 23,245	$ 23,167	$ 21,035	$ 12,604
Allowance for loan and lease losses, Percentage of total loans	1.19%		1.23%
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 7,394	7,915	$ 7,349	5,829	5,139	3,599
Allowance for loan and lease losses, Percentage of total loans	0.39%		0.39%
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 2,343	1,730	$ 1,831	1,817	1,398	1,231
Allowance for loan and lease losses, Percentage of total loans	0.12%		0.10%
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 4,110	3,871	$ 3,476	3,182	2,387	2,058
Allowance for loan and lease losses, Percentage of total loans	0.22%		0.18%
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 7,613	8,401	$ 9,708	11,700	11,514	5,074
Allowance for loan and lease losses, Percentage of total loans	0.41%		0.51%
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 435	356	$ 305	200	234	222
Allowance for loan and lease losses, Percentage of total loans	0.02%		0.02%
Other
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 638	$ 481	$ 576	$ 439	$ 363	$ 420
Allowance for loan and lease losses, Percentage of total loans	0.03%		0.03%

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Summary of Impaired Loans Evaluated for Specific Loss Allowance, Excluding Purchased Credit Impaired (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	$ 2,103	$ 3,061
Impaired loans with no related allowance recorded, Unpaid principal balance	2,109	3,248
Impaired loans with an allowance recorded, Recorded investment	0	102
Impaired loans with an allowance recorded, Unpaid principal balance	0	102
Impaired loans with an allowance recorded, Related allowance	0	66
Recorded investment	2,103	3,163
Unpaid principal balance	2,109	3,350
Commercial real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,154	1,179
Impaired loans with no related allowance recorded, Unpaid principal balance	1,135	1,176
Consumer real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	884	1,707
Impaired loans with no related allowance recorded, Unpaid principal balance	909	1,608
Construction and land development
Financing Receivable Impaired [Line Items]
Impaired loans with an allowance recorded, Recorded investment		102
Impaired loans with an allowance recorded, Unpaid principal balance		102
Impaired loans with an allowance recorded, Related allowance		66
Commercial and industrial
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	63	168
Impaired loans with no related allowance recorded, Unpaid principal balance	63	457
Impaired loans with an allowance recorded, Recorded investment	0
Impaired loans with an allowance recorded, Unpaid principal balance	0
Impaired loans with an allowance recorded, Related allowance	0
Consumer
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	2	7
Impaired loans with no related allowance recorded, Unpaid principal balance	$ 2	$ 7

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses - Summary of Average Recorded Investment and Interest Income Recognized on Impaired Loans, Excluding PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	$ 2,113	$ 2,246	$ 2,468	$ 2,620
Impaired loans with no related allowance recorded, Interest income recognized	16	26	49	86
Impaired loans with an allowance recorded, Average recorded investment	0	107	0	108
Average recorded investment	2,113	2,353	2,468	2,728
Interest income recognized	16	26	49	86
Commercial real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	1,159	1,191	1,174	1,458
Impaired loans with no related allowance recorded, Interest income recognized	16	17	48	57
Consumer real estate
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	889	961	1,181	982
Impaired loans with no related allowance recorded, Interest income recognized		9	0	27
Construction and land development
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment		0		0
Impaired loans with an allowance recorded, Average recorded investment		0		0
Commercial and industrial
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	63	90	64	176
Impaired loans with no related allowance recorded, Interest income recognized		0	1	2
Impaired loans with an allowance recorded, Average recorded investment	0	107	0	108
Consumer
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Average recorded investment	$ 2	$ 4	$ 49	4
Impaired loans with no related allowance recorded, Interest income recognized				$ 0

Loans and Allowance for Loan_11

Loans and Allowance for Loan Losses - Schedule of Aging of Recorded Investment in Past-due Loans, by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 5,953	$ 21,168
Loans Not Past Due	1,888,296	1,862,522
Total purchased credit impaired	21,271	28,392
Total	1,894,249	1,883,690
Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,322	1,585
Loans Not Past Due	767,514	636,706
Total loans excluding purchased credit impaired	768,836	638,291
Total purchased credit impaired	4,160	5,541
Total	772,996	643,832
Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,108	8,367
Loans Not Past Due	314,104	318,909
Total loans excluding purchased credit impaired	315,212	327,276
Total purchased credit impaired	13,050	16,515
Total	328,262	343,791
Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	42	3,415
Loans Not Past Due	210,430	171,174
Total loans excluding purchased credit impaired	210,472	174,589
Total purchased credit impaired	44	270
Total	210,516	174,859
Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	985	3,367
Loans Not Past Due	474,860	617,089
Total loans excluding purchased credit impaired	475,845	620,456
Total purchased credit impaired	2,434	2,990
Total	478,279	623,446
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	297	317
Loans Not Past Due	44,130	41,354
Total loans excluding purchased credit impaired	44,427	41,671
Total purchased credit impaired	1,242	2,608
Total	45,669	44,279
Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	394	290
Loans Not Past Due	57,792	52,725
Total loans excluding purchased credit impaired	58,186	53,015
Total purchased credit impaired	341	468
Total	58,527	53,483
Purchased credit impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,805	3,827
Loans Not Past Due	19,466	24,565
Total purchased credit impaired	21,271	28,392
30 - 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,127	12,791
30 - 59 Days Past Due | Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	65	409
30 - 59 Days Past Due | Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	425	6,084
30 - 59 Days Past Due | Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	30	2,670
30 - 59 Days Past Due | Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	437	1,734
30 - 59 Days Past Due | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	160	270
30 - 59 Days Past Due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	78	252
30 - 59 Days Past Due | Purchased credit impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	932	1,372
60 - 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,493	4,011
60 - 89 Days Past Due | Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
60 - 89 Days Past Due | Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	496	1,596
60 - 89 Days Past Due | Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		745
60 - 89 Days Past Due | Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	503	38
60 - 89 Days Past Due | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	99	40
60 - 89 Days Past Due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	316	38
60 - 89 Days Past Due | Purchased credit impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	79	1,554
Greater than 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,333	4,366
Greater than 89 Days Past Due | Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,257	1,176
Greater than 89 Days Past Due | Consumer real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	187	687
Greater than 89 Days Past Due | Construction and land development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	12
Greater than 89 Days Past Due | Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	45	1,595
Greater than 89 Days Past Due | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	38	7
Greater than 89 Days Past Due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due
Greater than 89 Days Past Due | Purchased credit impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 794	$ 901

Loans and Allowance for Loan_12

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	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	$ 3,431	$ 4,816
Past Due Over 89 Days and Accruing	1,560	3,295
Troubled Debt Restructurings	1,859	1,928
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	115	130
Past Due Over 89 Days and Accruing	1,257	1,176
Troubled Debt Restructurings	1,135	1,176
Consumer real estate
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	1,174	1,821
Past Due Over 89 Days and Accruing	77	342
Troubled Debt Restructurings	661	685
Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual		107
Past Due Over 89 Days and Accruing	12
Troubled Debt Restructurings	0
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	89	470
Past Due Over 89 Days and Accruing		1,205
Troubled Debt Restructurings	63	67
Consumer
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	47	9
Past Due Over 89 Days and Accruing	0	5
Troubled Debt Restructurings	0
Other
Accounts Notes And Loans Receivable [Line Items]
Troubled Debt Restructurings	0
Purchased credit impaired
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	2,006	2,279
Past Due Over 89 Days and Accruing	169	$ 567
Troubled Debt Restructurings	$ 0

Loans and Allowance for Loan_13

Loans and Allowance for Loan Losses - Summary of Contractually Required Payments (Details) $ in Thousands	Jul. 01, 2020USD ($)
Purchased Non Impaired [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments	$ 296,527
Cash flows expected to be collected at acquisition	3,718
Fair value of PCI loans at acquisition date	260,701
Fair value of acquired loans at acquisition date	260,701
Contractual cash flows not expected to be collected	3,718
F C B And B O W Mergers [Member] | Purchased Credit Impaired [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments	42,443
Nonaccretable difference	4,501
Cash flows expected to be collected at acquisition	37,942
Accretable yield	4,349
Fair value of PCI loans at acquisition date	33,593
Fair value of acquired loans at acquisition date	33,593
Contractual cash flows not expected to be collected	$ 37,942

Loans and Allowance for Loan_14

Loans and Allowance for Loan Losses - Schedule of Activity in Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule [Line Items]
Balance, beginning , carrying value	$ 22,765	$ 28,392
Change due to payments received and accretion	(1,494)	(7,121)
Balance, ending, carrying value	21,271	21,271
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	3,169	4,068
Accretion	(603)	(1,502)
Balance, ending, carrying value	$ 2,566	$ 2,566

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Operating lease, liability	$ 12,227,000		$ 12,227,000
Operating lease, right-of-use asset	$ 11,400,000		$ 11,400,000
Operating lease, weighted average remaining lease term	9 years 3 months 18 days		9 years 3 months 18 days
Operating lease, weighted average discount rate, percent	3.42%		3.42%
Sale and leaseback transaction	$ 0	$ 0	$ 0	$ 0

Premises and Equipment - Summar

Premises and Equipment - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Operating lease cost	$ 514	$ 1,588
Short-term lease cost	0	0
Variable lease cost	0	0
Total lease cost	$ 514	$ 1,588

Premises and Equipment - Maturi

Premises and Equipment - Maturity Analysis of Operating Lease Liabilities and Reconciliation of Undiscounted Cash Flows (Details) $ in Thousands	Sep. 30, 2021USD ($)
Lease payments due:
2021	$ 432
2022	1,751
2023	1,717
2024	1,425
2025	1,428
2026 and thereafter	7,655
Total undiscounted cash flows	14,408
Discount on cash flows	(2,181)
Operating lease, liability	$ 12,227

Short Term Borrowings And Lon_2

Short Term Borrowings And Long-Term Debt - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)BasisPoint	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Outstanding advances	$ 0		$ 10,000
Issuance of subordinated notes		$ 29,387
Subordinated Notes
Debt Instrument [Line Items]
Issuance of subordinated notes	30,000
Debt issuance costs	$ 600
Maturity date	Jun. 30, 2030
Redemption date	Jun. 30, 2025
Fixed interest rate	5.25%
Debt instrument, frequency of periodic interest payment	quarterly
Debt instrument, description of variable rate basis	The notes have a fixed interest rate of 5.25% per annum for the first five years. Thereafter, the interest rate will reset quarterly to an interest rate per annum equal to a benchmark rate (which is expected to be Three-Month Term SOFR) plus 513 basis points.
Carrying value of subordinated notes	$ 29,500		$ 29,400
Subordinated Notes | SOFR
Debt Instrument [Line Items]
Debt instrument, interest rate plus basis point | BasisPoint	513
Investment securities, FHLB stock and commercial and residential real estate mortgage loans
Debt Instrument [Line Items]
Federal Home Loan Bank Advances Collateralized Investment Securities Value	$ 2,200
Mortgage loans collateralized amount	634,100
Amount of available credit	$ 448,900

Accumulated Other Comprehensi_3

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						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 359,752	$ 343,787	$ 343,486	$ 281,950	$ 275,790	$ 273,046	$ 343,486	$ 273,046
Other comprehensive income (loss) before reclassification, net of tax							(7,214)	2,797
Amounts reclassified from accumulated other comprehensive income (loss), net of tax							(15)	2,624
Other comprehensive income (loss)	(1,582)	3,778	(9,425)	1,653	360	3,408	(7,229)	5,421
Ending balance	370,328	359,752	343,787	333,895	281,950	275,790	370,328	333,895
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance						(2,679)		(2,679)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax								2,679
Other comprehensive income (loss)								2,679
Ending balance				0				0
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			7,728			4,062	7,728	4,062
Other comprehensive income (loss) before reclassification, net of tax							(7,214)	2,797
Amounts reclassified from accumulated other comprehensive income (loss), net of tax							(15)	(55)
Other comprehensive income (loss)							(7,229)	2,742
Ending balance	499			6,804			499	6,804
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	2,081	(1,697)	7,728	5,151	4,791	1,383	7,728	1,383
Other comprehensive income (loss)	(1,582)	3,778	(9,425)	1,653	360	3,408	(7,229)	5,421
Ending balance	$ 499	$ 2,081	$ (1,697)	$ 6,804	$ 5,151	$ 4,791	$ 499	$ 6,804

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Summary of Amounts Reclassified out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net gain on sale of securities							$ 20	$ 74
Interest expense - Federal Home Loan Bank advances	$ 0			$ (116)			(12)	(348)
Income tax benefit (expense)	(3,147)			(2,115)			(9,075)	(3,299)
Net income	13,102	$ 12,076	$ 11,030	7,487	$ 6,181	$ 1,346	36,207	15,015
Reclassification out of Accumulated Other Comprehensive Income | Realized Losses on Cash Flow Hedges
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest expense money market accounts				(2,060)				(2,466)
Interest expense - Federal Home Loan Bank advances				(107)				(213)
Net income				(2,167)				(2,679)
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Available for Sale Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net gain on sale of securities	7			34			20	74
Income tax benefit (expense)	(2)			(9)			(5)	(19)
Net income	$ 5			$ 25			$ 15	$ 55

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes [Line Items]
Effective tax rate	19.40%	22.00%	20.00%	18.00%
Federal statutory income tax rate	21.00%		21.00%
CARES act of 2020, net operating loss carryback period			5 years
CARES act of 2020 net operating loss income tax benefit			$ (0.8)
Tennessee | State and Local Jurisdiction
Income Taxes [Line Items]
Excise tax rate	6.50%		6.50%

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Financial Instruments Representing Credit Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Unused commitments to extend credit	$ 806,444	$ 804,520
Standby letters of credit	10,397	10,403
Total	$ 816,841	$ 814,923

Derivatives - Additional Inform

Derivatives - Additional Information (Details) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments [Line Items]
Notional amount	$ 0	$ 0
Derivative termination fees	1,500
Remaining unrealized gains or losses in accumulated other comprehensive income recognized in net income	1,900
Unrealized gains or losses in accumulated other comprehensive income	$ 0

Derivatives - Summary of Custom

Derivatives - Summary of Customer Related Interest Rate Swaps (Details) - Interest Rate Swap [Member] - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments [Line Items]
Notional	$ 116,080,000	$ 119,892,000
Estimated	0	0
Pay Fixed And Receive Variable Swaps [Member]
Derivative Instruments [Line Items]
Notional	58,040,000	59,946,000
Estimated	(2,118,000)	(2,740,000)
Pay Variable And Receive Fixed Swaps [Member]
Derivative Instruments [Line Items]
Notional	58,040,000	59,946,000
Estimated	$ 2,118,000	$ 2,740,000

Derivatives - Summary of Net (L

Derivatives - Summary of Net (Losses) Gains Relating to Mortgage Banking Derivative Instruments Included in Mortgage Banking Income (Details) - Mortgage Banking Derivative Instrument [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Derivative Instruments [Line Items]
Net (losses) gains relating to mortgage banking derivative instruments	$ 86	$ (609)
Mortgage Loan Interest Rate Lock Commitments [Member]
Derivative Instruments [Line Items]
Net (losses) gains relating to mortgage banking derivative instruments	(221)	(1,528)
Mortgage Backed Securities Forward Sales Commitments [Member]
Derivative Instruments [Line Items]
Net (losses) gains relating to mortgage banking derivative instruments	$ 307	$ 919

Derivatives - Summary of Amount

Derivatives - Summary of Amount and Fair Value of Mortgage Banking Derivative Instruments Included in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Assets | Mortgage Loan Interest Rate Lock Commitments
Derivative Instruments [Line Items]
Notional amount, assets	$ 86,938	$ 88,303
Estimated fair value, asset	1,079	2,607
Other Assets | Mortgage-Backed Securities Forward Sales Commitments
Derivative Instruments [Line Items]
Notional amount, assets	72,500
Estimated fair value, asset	293
Other Liabilities | Mortgage-Backed Securities Forward Sales Commitments
Derivative Instruments [Line Items]
Notional amount, liabilities	0	87,000
Estimated fair value, liabilities	$ 0	$ 626

Stock Options and Restricted _3

Stock Options and Restricted Shares - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted	0	0
Time-Vested Restricted Stock Units and Performance Stock Units | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years
Time-Vested Restricted Stock Units and Performance Stock Units | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Performance Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Performance Stock Units | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards earning percentage	0.00%
Performance Stock Units | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards earning percentage	188.00%
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost	$ 1.9
Cost expected to be recognized over a weighted-average period	2 years
Total fair value of shares vested	$ 1.1
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Contractual term	10 years
Unrecognized compensation cost	$ 0.1
Cost expected to be recognized over a weighted-average period	7 months 6 days
2021 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of stock reserved for issuance of stock incentives	1,168,543
Shares issuable under both restricted share and stock option grants	1,168,543

Stock Options and Restricted _4

Stock Options and Restricted Shares - Summary of Company Recognized Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Stock-based compensation expense before income taxes	$ 373	$ 330	$ 1,169	$ 1,231
Less: deferred tax benefit	(98)	(86)	(306)	(322)
Reduction of net income	$ 275	$ 244	$ 863	$ 909

Stock Options and Restricted _5

Stock Options and Restricted Shares - Summary of Changes in Company's Nonvested Restricted Shares (Details)	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Restricted Shares, Abstract
Restricted Shares, Nonvested Beginning Balance | shares	148,414
Restricted Shares, Granted | shares	140,549
Restricted Shares, Vested | shares	(64,062)
Restricted Shares, Forfeited | shares	(23,222)
Restricted Shares, Nonvested Ending Balance | shares	201,679
Weighted Average Grant Date Fair Value, Abstract
Weighted Average Grant Date Fair Value, Nonvested Beginning Balance | $ / shares	$ 14.39
Weighted Average Grant Date Fair Value, Granted | $ / shares	14.81
Weighted Average Grant Date Fair Value, Vested | $ / shares	14.99
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	14.52
Weighted Average Grant Date Fair Value, Nonvested Ending Balance | $ / shares	$ 14.10

Stock Options and Restricted _6

Stock Options and Restricted Shares - Summary of Activity in Stock Options (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021$ / sharesshares	Dec. 31, 2020$ / sharesshares
Shares, Abstract
Shares Outstanding, Beginning Balance | shares	226,589
Shares Outstanding, Granted | shares	0	0
Shares Outstanding, Exercised | shares	(96,344)
Shares Outstanding, Forfeited or Expired | shares	0
Shares Outstanding, Ending Balance | shares	130,245	226,589
Shares, Fully Vested and Expected to Vest | shares	130,245
Shares, Exercisable at End of Period | shares	113,578
Weighted Average Exercise Price, Abstract
Weighted Average Exercise Price Outstanding, Beginning Balance | $ / shares	$ 11.73
Weighted Average Exercise Price Outstanding, Granted | $ / shares	0
Weighted Average Exercise Price Outstanding, Exercised | $ / shares	11.41
Weighted Average Exercise Price Outstanding, Forfeited or expired | $ / shares	0
Weighted Average Exercise Price Outstanding, Ending Balance | $ / shares	11.96	$ 11.73
Weighted Average Exercise Price, Fully vested and expected to vest | $ / shares	11.96
Weighted Average Exercise Price, Exercisable at End of Period | $ / shares	$ 11.54
Weighted Average Remaining Contractual Term (year), Abstract
Weighted Average Remaining Contractual Term Outstanding	5 years 2 months 12 days
Weighted Average Remaining Contractual Term, Fully Vested and Expected to Vest	5 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercisable at End of Period	4 years 9 months 18 days

Stock Options and Restricted _7

Stock Options and Restricted Shares - Information Related to Stock Options (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Intrinsic value of options exercised	$ 821,174	$ 188,662
Cash received from option exercises	1,077,489	105,847
Tax benefit realized from option exercises	$ 148,312	$ 16,524
Weighted average fair value of options granted	$ 0	$ 0

Regulatory Capital Requiremen_3

Regulatory Capital Requirements - Schedule of Capital Amounts and Ratios (Details) $ in Thousands		Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
CapStar Financial Holdings, Inc.
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital to risk-weighted assets, actual amount		$ 373,051	$ 338,426
Tier I capital to risk-weighted assets, actual amount		320,700	285,439
Tier I capital to average assets, actual amount		$ 320,700	$ 285,439
Total capital to risk-weighted assets, actual ratio		16.23	16.03
Tier I capital to risk-weighted assets, actual ratio		13.95	13.52
Tier I capital to average assets, actual ratio		10.28	9.60
Total capital to risk-weighted assets, minimum capital requirement amount	[1]	$ 183,922	$ 168,910
Tier I capital to risk-weighted assets, minimum capital requirement amount	[1]	137,941	126,682
Tier I capital to average assets, minimum capital requirement amount	[1]	$ 124,771	$ 118,877
Total capital to risk-weighted assets, minimum capital requirement ratio	[1]	8	8
Tier I capital to risk-weighted assets, minimum capital requirement ratio	[1]	6	6
Tier I capital to average assets, minimum capital requirement ratio	[1]	4	4
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		$ 320,700	$ 285,439
Tier I capital to risk-weighted assets, actual ratio		13.95	13.52
Tier I capital to risk-weighted assets, minimum capital requirement amount	[1]	$ 103,456	$ 95,012
Tier I capital to risk-weighted assets, minimum capital requirement ratio	[1]	4.5	4.5
CapStar Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital to risk-weighted assets, actual amount		$ 359,460	$ 324,152
Tier I capital to risk-weighted assets, actual amount		336,608	300,588
Tier I capital to average assets, actual amount		$ 336,608	$ 300,588
Total capital to risk-weighted assets, actual ratio		15.65	15.36
Tier I capital to risk-weighted assets, actual ratio		14.65	14.25
Tier I capital to average assets, actual ratio		10.82	10.12
Total capital to risk-weighted assets, minimum capital requirement amount	[1]	$ 183,781	$ 168,808
Tier I capital to risk-weighted assets, minimum capital requirement amount	[1]	137,835	126,606
Tier I capital to average assets, minimum capital requirement amount	[1]	$ 124,449	$ 118,780
Total capital to risk-weighted assets, minimum capital requirement ratio	[1]	8	8
Tier I capital to risk-weighted assets, minimum capital requirement ratio	[1]	6	6
Tier I capital to average assets, minimum capital requirement ratio	[1]	4	4
Total capital to risk-weighted assets, minimum to be well capitalized amount	[2]	$ 229,726	$ 211,010
Tier I capital to risk-weighted assets, minimum to be well capitalized amount	[2]	183,781	168,808
Tier I capital to average assets, minimum to be well capitalized amount	[2]	$ 155,561	$ 148,476
Total capital to risk-weighted assets, minimum to be well capitalized ratio	[2]	10	10
Tier I capital to risk-weighted assets, minimum to be well capitalized ratio	[2]	8	8
Tier I capital to average assets, minimum to be well capitalized ratio	[2]	5	5
CapStar Bank | Common Stock
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier I capital to risk-weighted assets, actual amount		$ 320,108	$ 284,088
Tier I capital to risk-weighted assets, actual ratio		13.93	13.46
Tier I capital to risk-weighted assets, minimum capital requirement amount	[1]	$ 103,377	$ 94,954
Tier I capital to risk-weighted assets, minimum capital requirement ratio	[1]	4.5	4.5
Tier I capital to risk-weighted assets, minimum to be well capitalized amount	[2]	$ 149,322	$ 137,156
Tier I capital to risk-weighted assets, minimum to be well capitalized ratio	[2]	6.50	6.5
[1]	For the calendar year 2021, 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.

Regulatory Capital Requiremen_4

Regulatory Capital Requirements - Schedule of Capital Amounts and Ratios (Parenthetical) (Details)	Sep. 30, 2021
Banking and Thrift, Interest [Abstract]
Minimum risk based capital ratios	2.5

Earnings Per Share - Summary of

Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic net income per share calculation:
Numerator – Net income	$ 13,102	$ 7,487	$ 36,207	$ 15,015
Denominator – Average common shares outstanding	22,164,278	21,948,579	22,114,948	19,558,281
Basic net income per share	$ 0.59	$ 0.34	$ 1.64	$ 0.77
Diluted net income per share calculation:
Numerator – Net income	$ 13,102	$ 7,487	$ 36,207	$ 15,015
Denominator – Average common shares outstanding	22,164,278	21,948,579	22,114,948	19,558,281
Dilutive shares contingently issuable	54,124	11,911	50,182	25,167
Average diluted common shares outstanding	22,218,402	21,960,490	22,165,130	19,583,448
Diluted net income per share	$ 0.59	$ 0.34	$ 1.63	$ 0.77

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Other real estate owned	$ 0	$ 0

Fair Value - Summary of Assets

Fair Value - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Debt Securities, Available-for-sale	$ 483,778	$ 486,215
Loans held for sale carried at fair value	79,842	97,303
U. S. government agency securities
Assets:
Debt Securities, Available-for-sale	11,610	16,391
State and municipal securities
Assets:
Debt Securities, Available-for-sale	83,687	91,928
Asset-backed securities
Assets:
Debt Securities, Available-for-sale	3,344	3,193
Other debt securities
Assets:
Debt Securities, Available-for-sale	64,637	38,340
Significant Unobservable Inputs (Level 3) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives
Derivative assets:
Mortgage loan interest rate lock commitments	1,079	2,607
Fair Value Measurements Recurring Basis
Assets:
Loans held for sale carried at fair value	79,842	97,303
Fair Value Measurements Recurring Basis | U. S. government agency securities
Assets:
Loans held for sale carried at fair value	11,610	16,391
Fair Value Measurements Recurring Basis | State and municipal securities
Assets:
Loans held for sale carried at fair value	83,687	91,928
Fair Value Measurements Recurring Basis | Mortgage-backed Securities
Assets:
Loans held for sale carried at fair value	320,500	336,363
Fair Value Measurements Recurring Basis | Asset-backed securities
Assets:
Loans held for sale carried at fair value	3,344	3,193
Fair Value Measurements Recurring Basis | Other debt securities
Assets:
Loans held for sale carried at fair value	64,637	38,340
Fair Value Measurements Recurring Basis | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives
Derivative assets:
Mortgage loan interest rate lock commitments	1,079	2,607
Fair Value Measurements Recurring Basis | Forward Sales Commitments | Non-hedging derivatives
Derivative assets:
Mortgage-backed securities forward sales commitments, asset	293
Derivative liabilities:
Mortgage-backed securities forward sales commitments, liability	(2,118)	(626)
Fair Value Measurements Recurring Basis | Customer Related | Non-hedging derivatives
Assets:
Interest rate swaps - customer related	2,118	2,740
Derivative liabilities:
Total derivatives		(2,740)
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U. S. government agency securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed Securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other debt securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives
Derivative assets:
Mortgage loan interest rate lock commitments		0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward Sales Commitments | Non-hedging derivatives
Derivative liabilities:
Mortgage-backed securities forward sales commitments, liability	0	0
Fair Value Measurements Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Customer Related | Non-hedging derivatives
Assets:
Interest rate swaps - customer related		0
Derivative liabilities:
Total derivatives		0
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets:
Loans held for sale carried at fair value	79,842	97,303
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | U. S. government agency securities
Assets:
Loans held for sale carried at fair value	11,610	16,391
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | State and municipal securities
Assets:
Loans held for sale carried at fair value	83,687	91,928
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed Securities
Assets:
Loans held for sale carried at fair value	320,500	336,363
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Assets:
Loans held for sale carried at fair value	3,344	3,193
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Other debt securities
Assets:
Loans held for sale carried at fair value	64,637	38,340
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives
Derivative assets:
Mortgage loan interest rate lock commitments		0
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Forward Sales Commitments
Derivative assets:
Mortgage-backed securities forward sales commitments, asset	293
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Forward Sales Commitments | Non-hedging derivatives
Derivative liabilities:
Mortgage-backed securities forward sales commitments, liability	(2,118)	(626)
Fair Value Measurements Recurring Basis | Significant Other Observable Inputs (Level 2) | Customer Related | Non-hedging derivatives
Assets:
Interest rate swaps - customer related		2,740
Derivative liabilities:
Total derivatives		(2,740)
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | U. S. government agency securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | State and municipal securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed Securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | Other debt securities
Assets:
Loans held for sale carried at fair value	0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives
Derivative assets:
Mortgage loan interest rate lock commitments		2,607
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | Forward Sales Commitments | Non-hedging derivatives
Derivative liabilities:
Mortgage-backed securities forward sales commitments, liability	$ 0	0
Fair Value Measurements Recurring Basis | Significant Unobservable Inputs (Level 3) | Customer Related | Non-hedging derivatives
Assets:
Interest rate swaps - customer related		0
Derivative liabilities:
Total derivatives		$ 0

Fair Value - Reconciliation of

Fair Value - Reconciliation of Assets Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Level 3) (Details) - Mortgage Loan Interest Rate Lock Commitments - Significant Unobservable Inputs (Level 3) - Fair Value Measurements Recurring Basis - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance of recurring Level 3 assets at January 1st	$ 2,607	$ 648
Included in mortgage banking income	(1,528)	3,488
Balance of recurring Level 3 assets at March 31st	$ 1,079	$ 4,136

Fair Value - Summary of Quantit

Fair Value - Summary of Quantitative Information About Level 3 Fair Value Measurements on Recurring and Non-recurring Basis (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Commercial and industrial | Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans		$ 36
Significant Unobservable Inputs (Level 3) | Commercial and industrial | Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Valuation Technique(s)		Sales Comparison approach
Unobservable Input(s)		Appraisal discounts
Impaired loans		$ 36
Significant Unobservable Inputs (Level 3) | Weighted Average | Commercial and industrial | Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range		0.10
Significant Unobservable Inputs (Level 3) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loan interest rate lock commitments	$ 1,079	$ 2,607
Valuation Technique(s)	Consensus pricing	Consensus pricing
Unobservable Input(s)	Origination pull-through rate	Origination pull-through rate
Significant Unobservable Inputs (Level 3) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range	0.59	0.54
Significant Unobservable Inputs (Level 3) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range	0.96	0.91
Significant Unobservable Inputs (Level 3) | Mortgage Loan Interest Rate Lock Commitments | Non-hedging derivatives | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable inputs range	0.82	0.74

Fair Value - Summary of Asset_2

Fair Value - Summary of Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring - Commercial and industrial $ in Thousands	Dec. 31, 2020USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans	$ 36
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans	0
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans	$ 36

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying Value and Fair Values of the Bank's Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2020
Financial assets:
Securities available-for-sale, at fair value	$ 483,778	$ 486,215
Securities held to maturity, fair value	1,847	2,504
Loans held for sale carried at fair value	79,842	97,303
Loans held for investment			$ 294,700
Carrying amount
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	339,367	277,439
Federal funds sold	19,900
Securities available-for-sale, at fair value	483,778	486,215
Securities held to maturity, fair value	1,788	2,407
Loans held for sale carried at fair value	176,488	186,998
Restricted equity securities	14,443	15,562
Loans held for investment	1,894,249	1,883,690
Accrued interest receivable	7,606	8,771
Other assets	83,072	46,381
Financial liabilities:
Deposits	2,674,392	2,568,001
Subordinated notes and Federal Home Loan bank advances	29,499	39,423
Other liabilities	2,902	3,334
Fair value | Level 1
Financial assets:
Cash and due from banks, interest-bearing deposits in financial institutions	339,367	277,439
Federal funds sold	19,900
Fair value | Level 3
Financial assets:
Loans held for investment	1,901,826	1,900,647
Financial liabilities:
Deposits	2,535,324	2,472,860
Other liabilities	2,902	3,334
Fair value | Level 2 / Level 3
Financial assets:
Other assets	83,072	46,381
Fair value | Significant Other Observable Inputs (Level 2)
Financial assets:
Securities available-for-sale, at fair value	483,778	486,215
Securities held to maturity, fair value	1,847	2,504
Loans held for sale carried at fair value	179,325	180,698
Accrued interest receivable	7,606	8,771
Financial liabilities:
Subordinated notes and Federal Home Loan bank advances	$ 31,022	$ 41,400