First Commonwealth Financial (FCF) 10-Q 8 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 05, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Sep. 30, 2021
Document Quarterly Report	true
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Registrant Name	FIRST COMMONWEALTH FINANCIAL CORP /PA/
Entity Central Index Key	0000712537
Entity File Number	001-11138
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Tax Identification Number	25-1428528
Entity Address, Address Line One	601 Philadelphia Street
Entity Address, City or Town	Indiana
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15701
City Area Code	724
Local Phone Number	349-7220
Entity Common Stock, Shares Outstanding		94,932,087
Entity Incorporation, State or Country Code	PA

Condensed Consolidated Statemen

Condensed Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 94,579	$ 100,009
Interest-bearing bank deposits	240,095	256,572
Securities available for sale, at fair value	1,124,956	831,223
Debt Securities, Held-to-maturity, Noncurrent	548,057	361,844
Other investments	12,719	12,227
Loans held for sale	19,925	33,436
Loans:
Portfolio loans	6,732,580	6,761,183
Allowance for credit losses	(94,185)	(101,309)
Net loans	6,638,395	6,659,874
Premises and equipment, net	117,879	125,517
Other real estate owned	502	1,215
Goodwill	303,328	303,328
Amortizing intangibles, net	11,764	13,492
Bank owned life insurance	225,746	225,952
Other assets	139,909	143,415
Total assets	9,477,854	9,068,104
Deposits (all domestic):
Noninterest-bearing	2,656,229	2,319,958
Interest-bearing	5,280,256	5,118,708
Total deposits	7,936,485	7,438,666
Short-term borrowings	117,754	117,373
Subordinated debentures	170,734	170,612
Other long-term debt	5,746	56,258
Capital Lease Obligations	6,039	6,385
Total long-term debt	182,519	233,255
Other liabilities	128,241	210,193
Total liabilities	8,364,999	7,999,487
Shareholders’ Equity
Preferred stock, $1 par value per share, 3,000,000 shares authorized, none issued	0	0
Common Stock, Value, Issued	113,915	113,915
Additional paid-in capital	495,929	494,683
Retained earnings	667,422	596,614
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,516	17,233
Treasury Stock, Value	(167,927)	(153,828)
Total shareholders’ equity	1,112,855	1,068,617
Total liabilities and shareholders’ equity	9,477,854	9,068,104
Securities held to maturity, fair value	$ 547,343	$ 369,851
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	113,914,902	113,914,902
Common stock, shares outstanding (in shares)	95,209,685	96,130,751
Treasury stock, shares (in shares)	18,705,217	17,784,151

Condensed Consolidated Statem_2

Condensed 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
Interest and fees on loans	$ 67,259	$ 67,474	$ 200,939	$ 207,290
Interest and dividends on investments:
Taxable interest	6,560	5,598	18,226	19,064
Interest exempt from federal income taxes	142	268	460	850
Dividends	105	159	386	536
Interest on bank deposits	130	94	297	163
Total interest income	74,196	73,593	220,308	227,903
Interest Expense
Interest on deposits	1,269	4,621	4,753	18,756
Interest on short-term borrowings	19	35	77	670
Interest on subordinated debentures	2,146	2,146	6,410	6,434
Interest on other long-term debt	56	356	596	1,065
Interest on lease obligations	61	66	185	199
Total interest expense	3,551	7,224	12,021	27,124
Net Interest Income	70,645	66,369	208,287	200,779
Provision for credit losses	330	11,212	1,353	49,038
Net Interest Income after Provision for Credit Losses	70,315	55,157	206,934	151,741
Noninterest Income
Net securities gains	0	20	16	47
Trust income	3,118	2,554	8,340	6,774
Service charges on deposit accounts	4,770	4,035	13,127	12,066
Insurance and retail brokerage commissions	2,218	2,156	6,368	5,982
Income from bank owned life insurance	1,486	1,547	4,946	4,963
Gain on sale of mortgage loans	3,485	6,437	11,615	13,226
Gain on sale of other loans and assets	2,480	1,871	6,281	3,151
Card-related interchange income	7,052	6,441	20,885	17,589
Derivatives mark to market	218	(160)	1,371	(2,122)
Swap fee income	317	41	1,715	864
Other income	2,101	1,827	6,022	5,314
Total noninterest income	27,245	26,769	80,686	67,854
Noninterest Expense
Salaries and employee benefits	31,066	28,823	88,084	87,573
Net occupancy expense	3,960	4,609	12,614	13,979
Furniture and equipment expense	4,052	4,033	11,866	11,468
Data processing expense	3,196	2,741	9,440	7,804
Advertising and promotion	1,150	1,115	3,829	3,800
Intangible amortization	1,257	1,254	3,347	3,246
Intangible amortization	868	939	2,597	2,792
Other professional fees and services	1,308	937	3,150	2,755
FDIC insurance	830	876	1,964	1,637
Loss on sale or write-down of assets	171	63	223	416
Litigation and operational losses	589	329	1,624	1,038
COVID-19 Related Expenses	50	125	357	567
Voluntary retirement plan expenses	0	3,304	0	3,304
Branch consolidation expenses	0	2,544	18	2,544
Other Noninterest Expense	6,530	6,555	19,316	18,351
Total noninterest expense	55,027	58,247	158,429	161,274
Income Before Income Taxes	42,533	23,679	129,191	58,321
Income tax provision	8,441	4,493	25,710	10,557
Net Income	$ 34,092	$ 19,186	$ 103,481	$ 47,764
Average Shares Outstanding (in shares)	95,616,421	97,917,096	95,883,868	97,990,749
Average Shares Outstanding Assuming Dilution (in shares)	95,892,304	98,160,143	96,130,602	98,224,506
Per Share Data:
Basic Earnings per Share (in dollars per share)	$ 0.36	$ 0.20	$ 1.08	$ 0.49
Diluted Earnings per Share (in dollars per share)	0.36	0.20	1.08	0.49
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.115	$ 0.110	$ 0.340	$ 0.330

Condensed Consolidated Statem_3

Condensed 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
Net Income	$ 34,092	$ 19,186	$ 103,481	$ 47,764
Other comprehensive (loss) income, before tax benefit (expense):
Unrealized holding (losses) gains on securities arising during the period	(4,025)	(3,256)	(18,122)	22,069
Less: reclassification adjustment for gains on securities included in net income	0	(20)	(16)	(47)
Unrealized holding (losses) gains on derivatives arising during the period	(529)	225	776	(4,892)
Less: reclassification adjustment for losses on derivatives included in net income	0	0	0	0
Total other comprehensive (loss) income, before tax benefit (expense)	(4,554)	(3,051)	(17,362)	17,130
Income tax benefit (expense) related to items of other comprehensive (loss) income	955	640	3,645	(3,598)
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Comprehensive Income	$ 30,493	$ 16,775	$ 89,764	$ 61,296

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Previously Reported [Member]	Common Stock [Member]	Common Stock [Member]Previously Reported [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Previously Reported [Member]	Retained Earnings [Member]	Retained Earnings [Member]Previously Reported [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]Previously Reported [Member]	Treasury Stock [Member]	Treasury Stock [Member]Previously Reported [Member]
Beginning balance at Dec. 31, 2019	$ 1,055,665		$ 113,915		$ 493,737		$ 577,348		$ 5,579		$ (134,914)
Beginning balance, shares at Dec. 31, 2019			98,311,840
Net Income	47,764						47,764
Other comprehensive income (loss)	13,532								13,532
Dividends, declared (USD per share)	(32,408)						(32,408)
Treasury stock acquired	(14,373)										(14,373)
Treasury stock acquired, shares			(1,638,812)
Stock Issued During Period, Value, Treasury Stock Reissued	1,816				458		0				1,358
Stock Issued During Period, Shares, Treasury Stock Reissued			158,453
Restricted stock	835		$ 0		487		0				348
Restricted stock, shares			93,300
Stock Issued During Period, Value, Treasury Stock Reissued	1,594
Ending balance at Sep. 30, 2020	$ 1,072,831		$ 113,915		494,682		592,704		19,111		(147,581)
Ending balance, shares at Sep. 30, 2020			96,924,781
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.330
Beginning balance at Jun. 30, 2020		$ 1,075,705		$ 113,915		$ 494,682		$ 584,312		$ 21,522		$ (138,726)
Beginning balance, shares at Jun. 30, 2020				98,132,697
Net Income	$ 19,186						19,186
Other comprehensive income (loss)	(2,411)								(2,411)
Dividends, declared (USD per share)	(10,794)						(10,794)
Treasury stock acquired	(9,153)										(9,153)
Treasury stock acquired, shares			(1,207,916)
Stock Issued During Period, Value, Treasury Stock Reissued	0				0		0				0
Stock Issued During Period, Shares, Treasury Stock Reissued			0
Restricted stock	298		$ 0		0		0				298
Restricted stock, shares			0
Ending balance at Sep. 30, 2020	$ 1,072,831		$ 113,915		494,682		592,704		19,111		(147,581)
Ending balance, shares at Sep. 30, 2020			96,924,781
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.110
Beginning balance at Dec. 31, 2020	$ 1,068,617		$ 113,915		494,683		596,614		17,233		(153,828)
Beginning balance, shares at Dec. 31, 2020	96,130,751		96,130,751
Net Income	$ 103,481						103,481
Other comprehensive income (loss)	(13,717)								(13,717)
Dividends, declared (USD per share)	(32,673)						(32,673)
Treasury stock acquired	(15,985)										(15,985)
Treasury stock acquired, shares			(1,194,062)
Stock Issued During Period, Value, Treasury Stock Reissued	2,264				771		0				1,493
Stock Issued During Period, Shares, Treasury Stock Reissued			173,907
Restricted stock	868		$ 0		475		0				393
Restricted stock, shares			99,089
Stock Issued During Period, Value, Treasury Stock Reissued	2,042
Ending balance at Sep. 30, 2021	$ 1,112,855		$ 113,915		495,929		667,422		3,516		(167,927)
Ending balance, shares at Sep. 30, 2021	95,209,685		95,209,685
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.340
Beginning balance at Jun. 30, 2021	$ 1,106,419		$ 113,915		495,899		644,362		7,115		(154,872)
Beginning balance, shares at Jun. 30, 2021			96,201,628
Net Income	34,092						34,092
Other comprehensive income (loss)	(3,599)								(3,599)
Dividends, declared (USD per share)	(11,032)						(11,032)
Treasury stock acquired	(13,327)										(13,327)
Treasury stock acquired, shares			(997,943)
Stock Issued During Period, Value, Treasury Stock Reissued	0				0		0				0
Stock Issued During Period, Shares, Treasury Stock Reissued			0
Restricted stock	302		$ 0		30		0				272
Restricted stock, shares			6,000
Ending balance at Sep. 30, 2021	$ 1,112,855		$ 113,915		$ 495,929		$ 667,422		$ 3,516		$ (167,927)
Ending balance, shares at Sep. 30, 2021	95,209,685		95,209,685
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.115

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net Income	$ 103,481	$ 47,764
Provision for credit losses	1,353	49,038
Deferred tax expense (benefit)	1,057	(5,059)
Depreciation and amortization	8,784	8,676
Net gains on securities and other assets	(17,093)	(12,608)
Net amortization of premiums and discounts on securities	3,693	4,662
Income from increase in cash surrender value of bank owned life insurance	(4,617)	(4,699)
Decrease (increase) in interest receivable	4,590	(13,105)
Mortgage loans originated for sale	(308,744)	(287,196)
Proceeds from sale of mortgage loans	338,115	281,424
Increase in interest payable	929	575
Increase (decrease) in income taxes payable	2,142	(536)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	14,267	(1,888)
Net cash provided by operating activities	119,423	70,824
Investing Activities
Proceeds from sale and maturity of held-to-maturity securities	89,698	76,841
Payments to Acquire Held-to-maturity Securities	(337,054)	(9,621)
Proceeds from Sale of Available-for-sale Securities	0	0
Proceeds from maturities and redemptions of available-for-sale securities	353,788	272,544
Purchases of available-for-sale securities	(667,861)	(282,461)
Purchases of FHLB stock	(3,552)	(21,903)
Proceeds from the redemption of FHLB stock	3,060	25,698
Proceeds from Life Insurance Policy	5,208	1,147
Proceeds from Sale of Loans Receivable	52,919	25,534
Proceeds from sale of other assets	6,620	4,875
Net increase in loans	(37,782)	(798,377)
Payments for Purchase of Other Assets	(6,056)	(6,570)
Net cash used in investing activities	(541,012)	(712,293)
Financing Activities
Net increase (decrease) in other short-term borrowings	381	(79,497)
Net increase in deposits	497,915	1,026,580
Repayments of other long-term debt	(50,512)	(493)
Repayments of Long-term Capital Lease Obligations	346	321
Payments of Dividends	(32,673)	(32,408)
Proceeds from reissuance of treasury stock	222	222
Purchase of treasury stock	(15,305)	(14,373)
Net cash provided by financing activities	399,682	899,710
Net (decrease) increase in cash and cash equivalents	(21,907)	258,241
Cash and cash equivalents at January 1	356,581	121,856
Cash and cash equivalents at September 30	$ 334,674	$ 380,097

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accounting and reporting policies of First Commonwealth Financial Corporation and its subsidiaries (“First Commonwealth” or the “Company”) conform with generally accepted accounting principles in the United States of America (“GAAP”). The preparation of financial statements in conformity with GAAP requires management to make estimates, assumptions and judgments that affect the amounts reported in the financial statements and accompanying notes. Actual realized amounts could differ from those estimates. In the opinion of management, the unaudited interim consolidated financial statements include all adjustments (consisting of only normal recurring adjustments) necessary for a fair presentation of First Commonwealth’s financial position, results of operations, comprehensive income, cash flows and changes in shareholders’ equity as of and for the periods presented. Certain information and Note disclosures normally included in Consolidated Financial Statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and interest-bearing bank deposits. Generally, federal funds are sold for one-day periods.

Supplemental Comprehensive Inco

Supplemental Comprehensive Income Disclosures	9 Months Ended
	Sep. 30, 2021
Supplemental Comprehensive Income Disclosures [Abstract]
Comprehensive Income (Loss) Note	Supplemental Comprehensive Income Disclosures The following table identifies the related tax effects allocated to each component of other comprehensive income (“OCI”) in the unaudited Consolidated Statements of Comprehensive Income. Reclassification adjustments related to securities available for sale are included in the "Net securities gains" line and reclassification adjustments related to losses on derivatives are included in the "Other operating" line in the unaudited Consolidated Statements of Income. For the Nine Months Ended September 30, 2021 2020 Pretax Amount Tax (Expense) Benefit Net of Tax Amount Pretax Amount Tax (Expense) Benefit Net of Tax Amount (dollars in thousands) Unrealized (losses) gains on securities: Unrealized holding (losses) gains on securities arising during the period $ (18,122) $ 3,805 $ (14,317) $ 22,069 $ (4,635) $ 17,434 Reclassification adjustment for gains on securities included in net income (16) 3 (13) (47) 10 (37) Total unrealized (losses) gains on securities (18,138) 3,808 (14,330) 22,022 (4,625) 17,397 Unrealized gains (losses) on derivatives: Unrealized holding gains (losses) on derivatives arising during the period 776 (163) 613 (4,892) 1,027 (3,865) Reclassification adjustment for losses on derivatives included in net income — — — — — — Total unrealized gains (losses) on derivatives 776 (163) 613 (4,892) 1,027 (3,865) Total other comprehensive (loss) income $ (17,362) $ 3,645 $ (13,717) $ 17,130 $ (3,598) $ 13,532 For the Three Months Ended September 30, 2021 2020 Pretax Amount Tax (Expense) Benefit Net of Tax Amount Pretax Amount Tax (Expense) Benefit Net of Tax Amount (dollars in thousands) Unrealized losses on securities: Unrealized holding losses on securities arising during the period $ (4,025) $ 844 $ (3,181) $ (3,256) $ 684 $ (2,572) Reclassification adjustment for gains on securities included in net income — — — (20) 4 (16) Total unrealized losses on securities (4,025) 844 (3,181) (3,276) 688 (2,588) Unrealized (losses) gains on derivatives: Unrealized holding (losses) gains on derivatives arising during the period (529) 111 (418) 225 (48) 177 Reclassification adjustment for losses on derivatives included in net income — — — — — — Total unrealized (losses) gains on derivatives (529) 111 (418) 225 (48) 177 Total other comprehensive loss $ (4,554) $ 955 $ (3,599) $ (3,051) $ 640 $ (2,411) The following table details the change in components of OCI for the nine months ended September 30: 2021 2020 Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) (dollars in thousands) Balance at December 31 $ 20,310 $ (182) $ (2,895) $ 17,233 $ 4,580 $ 365 $ 634 $ 5,579 Other comprehensive (loss) income before reclassification adjustment (14,317) — 613 (13,704) 17,434 — (3,865) 13,569 Amounts reclassified from accumulated other comprehensive (loss) income (13) — — (13) (37) — — (37) Net other comprehensive (loss) income during the period (14,330) — 613 (13,717) 17,397 — (3,865) 13,532 Balance at September 30 $ 5,980 $ (182) $ (2,282) $ 3,516 $ 21,977 $ 365 $ (3,231) $ 19,111 The following table details the change in components of OCI for the three months ended September 30: 2021 2020 Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) (dollars in thousands) Balance at June 30 $ 9,161 $ (182) $ (1,864) $ 7,115 $ 24,565 $ 365 $ (3,408) $ 21,522 Other comprehensive loss before reclassification adjustment (3,181) — (418) (3,599) (2,572) — 177 (2,395) Amounts reclassified from accumulated other comprehensive (loss) income — — — — (16) — — (16) Net other comprehensive loss during the period (3,181) — (418) (3,599) (2,588) — 177 (2,411) Balance at September 30 $ 5,980 $ (182) $ (2,282) $ 3,516 $ 21,977 $ 365 $ (3,231) $ 19,111

Supplemental Cash Flow Note

Supplemental Cash Flow Note	9 Months Ended
	Sep. 30, 2021
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Disclosures	Supplemental Cash Flow Disclosures The following table presents information related to cash paid during the period for interest and income taxes, as well as detail on non-cash investing and financing activities for the nine months ended September 30: 2021 2020 (dollars in thousands) Cash paid during the period for: Interest $ 11,039 $ 26,687 Income taxes 22,374 16,207 Non-cash investing and financing activities: Loans transferred to other real estate owned and repossessed assets 2,533 3,206 Loans transferred from held to maturity to held for sale 55,700 27,391 Loans transferred from available for sale to held to maturity — 1,908 Gross (decrease) increase in market value adjustment to securities available for sale (18,138) 22,022 Gross increase (decrease) in market value adjustment to derivatives 776 (4,892) Investments committed to purchase, not settled — 22,644 Increase in limited partnership investment unfunded commitment 6,929 — Noncash treasury stock reissuance 2,042 1,594 Unsettled treasury stock repurchases 680 — Proceeds from death benefit on bank owned life insurance not received (384) (384)

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share The following table summarizes the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computations: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Weighted average common shares issued 113,914,902 113,914,902 113,914,902 113,914,902 Average treasury stock shares (18,103,611) (15,821,469) (17,840,694) (15,761,114) Average deferred compensation shares (55,615) (45,454) (55,581) (41,790) Average unearned nonvested shares (139,255) (130,883) (134,759) (121,249) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 95,616,421 97,917,096 95,883,868 97,990,749 Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share 220,268 197,545 191,119 188,255 Additional common stock equivalents (deferred compensation) used to calculate diluted earnings per share 55,615 45,502 55,615 45,502 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 95,892,304 98,160,143 96,130,602 98,224,506 Basic Earnings per Share $ 0.36 $ 0.20 $ 1.08 $ 0.49 Diluted Earnings per Share $ 0.36 $ 0.20 $ 1.08 $ 0.49 The following table shows the number of shares and the price per share related to common stock equivalents that were not included in the computation of diluted earnings per share for the nine months ended September 30 because to do so would have been antidilutive. 2021 2020 Price Range Price Range Shares From To Shares From To Restricted Stock 111,589 $ 12.77 $ 14.58 110,068 $ 13.72 $ 15.44 Restricted Stock Units 29,547 $ 16.41 $ 16.41 102,844 $ 12.43 $ 15.37

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Commitments and Letters of Credit Standby letters of credit and commercial letters of credit are conditional commitments issued by First Commonwealth to guarantee the performance of a customer to a third party. The contract or notional amount of these instruments reflects the maximum amount of future payments that First Commonwealth could be required to pay under the guarantees if there were a total default by the guaranteed parties, without consideration of possible recoveries under recourse provisions or from collateral held or pledged. In addition, many of these commitments are expected to expire without being drawn upon; therefore, the total commitment amounts do not necessarily represent future cash requirements. The following table identifies the notional amount of those instruments at: September 30, 2021 December 31, 2020 (dollars in thousands) Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 2,270,058 $ 2,097,628 Financial standby letters of credit 15,914 15,988 Performance standby letters of credit 11,233 16,864 Commercial letters of credit 975 783 The notional amounts outstanding as of September 30, 2021 include amounts issued in 2021 of $2.5 million in performance standby letters of credit and $0.1 million in financial standby letters of credit. There were no commercial letters of credit issued in 2021, however there was a change in terms for one letter of credit which increased its commitment amount. A liability of $0.1 million has been recorded as of both September 30, 2021 and December 31, 2020, which represents the estimated fair value of letters of credit issued. The fair value of letters of credit is estimated based on the unrecognized portion of fees received at the time the commitment was issued. Unused commitments and letters of credit provide exposure to future credit loss in the event of nonperformance by the borrower or guaranteed parties. Management’s evaluation of the credit risk related to these commitments resulted in the recording of a liability of $6.4 million and $7.4 million as of September 30, 2021 and December 31, 2020, respectively. This liability is reflected in "Other liabilities" in the unaudited Consolidated Statements of Financial Condition. The credit risk evaluation incorporates the expected loss percentage calculated for comparable loan categories as part of the allowance for credit losses for loans as well as estimated utilization for each loan category. Legal Proceedings First Commonwealth and its subsidiaries are subject in the normal course of business to various pending and threatened legal proceedings in which claims for monetary damages are asserted. As of September 30, 2021, management, after consultation with legal counsel, does not anticipate that the aggregate ultimate liability arising out of litigation pending or threatened against First Commonwealth or its subsidiaries will be material to First Commonwealth’s consolidated financial position. On at least a quarterly basis, First Commonwealth assesses its liabilities and contingencies in connection with such legal proceedings. For those matters where it is probable that First Commonwealth will incur losses and the amounts of the losses can be reasonably estimated, First Commonwealth records an expense and corresponding liability in its consolidated financial statements. To the extent the pending or threatened litigation could result in exposure in excess of that liability, the amount of such excess is not currently estimable. Although not considered probable, the range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability (if any), is between $0 and $1 million. Although First Commonwealth does not believe that the outcome of pending litigation will be material to First Commonwealth’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations and cash flows for a particular reporting period in the future.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2021
Investment Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Investment Securities Securities Available for Sale Below is an analysis of the amortized cost and estimated fair values of securities available for sale at: September 30, 2021 December 31, 2020 Amortized Gross Gross Estimated Amortized Gross Gross Estimated (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities – Residential $ 5,448 $ 534 $ — $ 5,982 $ 6,492 $ 738 $ — $ 7,230 Mortgage-Backed Securities – Commercial 390,566 4,588 (1,447) 393,707 182,823 8,357 — 191,180 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential 682,677 9,296 (6,547) 685,426 481,109 14,924 — 496,033 Other Government-Sponsored Enterprises 1,000 — (9) 991 100,996 2 — 100,998 Obligations of States and Political Subdivisions 9,586 105 (81) 9,610 11,154 243 — 11,397 Corporate Securities 28,107 1,173 (40) 29,240 22,941 1,444 — 24,385 Total Securities Available for Sale $ 1,117,384 $ 15,696 $ (8,124) $ 1,124,956 $ 805,515 $ 25,708 $ — $ 831,223 Mortgage-backed securities include mortgage-backed obligations of U.S. Government agencies and obligations of U.S. Government-sponsored enterprises. These obligations have contractual maturities ranging from less than one year to approximately 30 years,, with lower anticipated lives to maturity due to prepayments. All mortgage-backed securities contain a certain amount of risk related to the uncertainty of prepayments of the underlying mortgages. Interest rate changes have a direct impact upon prepayment speeds; therefore, First Commonwealth uses computer simulation models to test the average life and yield volatility of all mortgage-backed securities under various interest rate scenarios to monitor the potential impact on earnings and interest rate risk positions. Expected maturities will differ from contractual maturities because issuers may have the right to call or repay obligations with or without call or prepayment penalties. Other fixed income securities within the portfolio also contain prepayment risk. The amortized cost and estimated fair value of debt securities available for sale at September 30, 2021, by contractual maturity, are shown below. Amortized Estimated (dollars in thousands) Due within 1 year $ 5,000 $ 5,027 Due after 1 but within 5 years 13,872 14,498 Due after 5 but within 10 years 19,821 20,316 Due after 10 years — — 38,693 39,841 Mortgage-Backed Securities (a) 1,078,691 1,085,115 Total Debt Securities $ 1,117,384 $ 1,124,956 (a) Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $396.0 million and a fair value of $399.7 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $682.7 million and a fair value of $685.4 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac. Proceeds from sales, gross gains (losses) realized on sales and maturities related to securities held to maturity and securities available for sale were as follows for the nine months ended September 30: 2021 2020 (dollars in thousands) Proceeds from sales $ — $ — Gross gains (losses) realized: Sales transactions: Gross gains $ — $ — Gross losses — — — — Maturities Gross gains 16 47 Gross losses — — 16 47 Net gains $ 16 $ 47 Securities available for sale with an estimated fair value of $802.2 million and $792.1 million were pledged as of September 30, 2021 and December 31, 2020, respectively, to secure public deposits and for other purposes required or permitted by law. Securities Held to Maturity Below is an analysis of the amortized cost and fair values of debt securities held to maturity at: September 30, 2021 December 31, 2020 Amortized Gross Gross Estimated Amortized Gross Gross Estimated (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities – Residential $ 2,432 $ 125 $ — $ 2,557 $ 2,766 $ 138 $ — $ 2,904 Mortgage-Backed Securities- Commercial 96,228 590 (834) 95,984 36,799 1,441 — 38,240 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential 387,399 3,832 (4,303) 386,928 277,351 5,389 (10) 282,730 Mortgage-Backed Securities – Commercial 7,927 235 — 8,162 9,737 344 — 10,081 Other Government-Sponsored Enterprises 21,825 — (726) 21,099 — — — — Obligations of States and Political Subdivisions 31,246 461 (94) 31,613 34,391 705 — 35,096 Debt Securities Issued by Foreign Governments 1,000 — — 1,000 800 — — 800 Total Securities Held to Maturity $ 548,057 $ 5,243 $ (5,957) $ 547,343 $ 361,844 $ 8,017 $ (10) $ 369,851 The amortized cost and estimated fair value of debt securities held to maturity at September 30, 2021, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Amortized Estimated (dollars in thousands) Due within 1 year $ 1,800 $ 1,807 Due after 1 but within 5 years 5,568 5,616 Due after 5 but within 10 years 43,207 42,769 Due after 10 years 3,496 3,520 54,071 53,712 Mortgage-Backed Securities (a) 493,986 493,631 Total Debt Securities $ 548,057 $ 547,343 (a) Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $98.7 million and a fair value of $98.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $395.3 million and a fair value of $395.1 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac. Securities held to maturity with an amortized cost of $334.5 million and $228.1 million were pledged as of September 30, 2021 and December 31, 2020, respectively, to secure public deposits and for other purposes required or permitted by law. Other Investments As a member of the Federal Home Loan Bank ("FHLB"), First Commonwealth is required to purchase and hold stock in the FHLB to satisfy membership and borrowing requirements. The level of stock required to be held is dependent on the amount of First Commonwealth's mortgage-related assets and outstanding borrowings with the FHLB. This stock is restricted in that it can only be sold to the FHLB or to another member institution, and all sales of FHLB stock must be at par. As a result of these restrictions, FHLB stock is unlike other investment securities insofar as there is no trading market for FHLB stock and the transfer price is determined by FHLB membership rules and not by market participants. As of September 30, 2021 and December 31, 2020, our FHLB stock totaled $11.0 million and $10.6 million, respectively, and is included in “Other investments” on the unaudited Consolidated Statements of Financial Condition. FHLB stock is held as a long-term investment and its value is determined based on the ultimate recoverability of the par value. First Commonwealth evaluates impairment quarterly and has concluded that the par value of its investment in FHLB stock will be recovered. Accordingly, no impairment charge was recorded on these securities during the three and nine months ended September 30, 2021. As of both September 30, 2021 and December 31, 2020, "Other investments" also includes $1.7 million in equity securities. These securities do not have a readily determinable fair value and are carried at cost. During the nine-months ended September 30, 2021 and 2020, there were no gains or losses recognized through earnings on equity securities. On a quarterly basis, management evaluates equity securities by reviewing the severity and duration of decline in estimated fair value, research reports, analysts’ recommendations, credit rating changes, news stories, annual reports, regulatory filings, impact of interest rate changes and other relevant information. Impairment of Investment Securities We review our investment portfolio on a quarterly basis for indications of impairment. For available for sale securities, the review includes analyzing the financial condition and near-term prospects of the issuer, including any specific events which may influence the operations of the issuer and whether we are more likely than not to sell the security. We evaluate whether we are more likely than not to sell debt securities based upon our investment strategy for the particular type of security and our cash flow needs, liquidity position, capital adequacy, tax position and interest rate risk position. Held-to-maturity securities are evaluated for impairment on a quarterly basis using historical probability of default and loss given default information specific to the investment category. If this evaluation determines that credit losses exist an allowance for credit loss is recorded and included in earnings as a component of credit loss expense. First Commonwealth utilizes the specific identification method to determine the net gain or loss on debt securities and the average cost method to determine the net gain or loss on equity securities. The following table presents the gross unrealized losses and estimated fair values at September 30, 2021 for both available for sale and held to maturity securities by investment category and time frame for which securities have been in a continuous unrealized loss position: Less Than 12 Months 12 Months or More Total Estimated Gross Estimated Gross Estimated Gross (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities – Commercial $ 213,203 $ (2,281) $ — $ — $ 213,203 $ (2,281) Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential 640,235 (10,850) — — 640,235 (10,850) Other Government-Sponsored Enterprises 22,090 (735) — — 22,090 (735) Obligations of States and Political Subdivisions 13,798 (175) — — 13,798 (175) Corporate Securities 5,111 (40) — — 5,111 (40) Total Securities $ 894,437 $ (14,081) $ — $ — $ 894,437 $ (14,081) At September 30, 2021, fixed income securities issued by the U.S. Government and U.S. Government-sponsored enterprises comprised 98% of total unrealized losses due to changes in market interest rates. At September 30, 2021, there are 52 debt securities in an unrealized loss position. The following table presents the gross unrealized losses and estimated fair values at December 31, 2020 by investment category and time frame for which securities have been in a continuous unrealized loss position: Less Than 12 Months 12 Months or More Total Estimated Gross Estimated Gross Estimated Gross (dollars in thousands) Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential $ 3,755 $ (10) $ — $ — $ 3,755 $ (10) Total Securities $ 3,755 $ (10) $ — $ — $ 3,755 $ (10) As of September 30, 2021, our corporate securities had an amortized cost and an estimated fair value of $28.1 million and $29.2 million, respectively. As of December 31, 2020, our corporate securities had an amortized cost and estimated fair value of $22.9 million and $24.4 million, respectively. Corporate securities are comprised of debt issued by large regional banks. There was one corporate security in an unrealized loss position as of September 30, 2021 and none as of December 31, 2020. When unrealized losses exist, management reviews each of the issuer’s asset quality, earnings trends and capital position to determine whether the unrealized loss position is a result of credit losses. All interest payments on the corporate securities are being made as contractually required. There was no expected credit related impairment recognized on investment securities during the nine months ended September 30, 2021 and 2020.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure	Loans and Allowance for Credit Losses Loans are presented in the Consolidated Statements of Financial Condition net of deferred fees and costs, and discounts related to purchased loans. Net deferred fees were $2.6 million and $6.0 million as of September 30, 2021 and December 31, 2020, respectively, and discounts on purchased loans were $6.3 million and $7.0 million at September 30, 2021 and December 31, 2020, respectively. The following table provides outstanding balances related to each of our loan types: September 30, 2021 December 31, 2020 (dollars in thousands) Commercial, financial, agricultural and other $ 1,224,591 $ 1,555,986 Time and demand 1,210,694 1,541,382 Commercial credit cards 13,897 14,604 Real estate construction 424,016 427,221 Residential real estate 1,875,375 1,750,592 Residential first lien 1,254,142 1,144,323 Residential junior lien/home equity 621,233 606,269 Commercial real estate 2,231,890 2,211,569 Multifamily 405,720 371,239 Nonowner occupied 1,442,845 1,421,151 Owner occupied 383,325 419,179 Loans to individuals 976,708 815,815 Automobile 886,367 712,800 Consumer credit cards 10,617 12,360 Consumer other 79,724 90,655 Total loans $ 6,732,580 $ 6,761,183 In the table above, Commercial, financial, agricultural and other loans at September 30, 2021 and December 31, 2020 includes $152.1 million and $478.9 million, respectively, in Paycheck Protection Program ("PPP") loans for small businesses who meet the necessary eligibility requirements. PPP loans are 100% guaranteed by the Small Business Administration ("SBA") under the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") and are forgivable, in whole or in part, if the proceeds are used for payroll and other permitted purposes in accordance with the PPP requirements. Because PPP loans are fully guaranteed by the SBA, there is no allowance for credit losses recognized for these loans. Although the Company believes that the majority of these loans will ultimately be forgiven by the SBA in accordance with the terms of the program, there could be risks and liability to the Company associated with participation in the program. On March 27, 2020, the CARES Act was signed into law, providing banking organizations with optional, temporary relief from complying with CECL. The Company elected to defer its adoption of CECL until the fourth quarter 2020. At the end of the deferral period, CECL was adopted effective January 1, 2020. The allowance for credit losses for the interim period ending September 30, 2020, was calculated in accordance with previously applicable GAAP. First Commonwealth’s loan portfolio includes five primary loan categories. When calculating the allowance for credit losses these categories are classified into eleven portfolio segments. The composition of loans by portfolio segment includes: Commercial, financial, agricultural and other Time & Demand - Consists primarily of commercial and industrial loans. This category consists of loans that are typically cash flow dependent and therefore have different risk and loss characteristics than other commercial loans. Loans in this category include revolving and term structures with fixed and variable interest rates. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and economic conditions measured by GDP. Commercial Credit Cards - Consists of unsecured credit cards for commercial customers. These commercial credit cards have separate characteristics outside of normal commercial non-real estate loans, as they tend to have shorter overall duration. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and economic conditions measured by GDP. Real estate construction Includes both 1-4 family and commercial construction loans. The risk and loss characteristics of the construction category are different than other real estate secured categories due to the collateral being at various stages of completion. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and measures of completed construction projects. Residential real estate Residential first lien - Consists of loans with collateral of 1-4 family residencies with a senior lien position. The risk and loss characteristics are unique for this group because the collateral for these loans are the borrower’s primary residence. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and residential property values. Residential Junior Lien/Home Equity - Consists of loans with collateral of 1-4 family residencies with an open end line of credit or junior lien position. The junior lien position for the majority of these loans provides a higher risk of loss than other residential real estate loans. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and residential property values. Commercial real estate Multifamily - Consists of loans secured by commercial multifamily properties. Real estate related to rentals to consumers could provide unique risk and loss characteristics. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of commercial real estate values and rental vacancy. Nonowner Occupied - Consists of loans secured by commercial real estate non-owner occupied and provides different loss characteristics than other real estate categories. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and economic conditions measured by GDP. Owner Occupied - Consists of loans secured by commercial real estate owner occupied properties. The risk and loss characteristics of this category were considered different than other real estate categories because it is owner occupied and would impact the ability to conduct business. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of national unemployment and economic conditions measured by GDP. Loans to individuals Automobile - Consists of both direct and indirect loans with automobiles and recreational vehicles held as collateral. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of consumer sentiment and automobile retention value. Consumer Credit Cards – Consists of unsecured consumer credit cards. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of consumer sentiment and economic conditions measured by GDP. Other Consumer - Consists of lines of credit, student loans and other consumer loans, not secured by real estate or autos. The primary macroeconomic drivers for estimating credit losses for this category include forecasts of consumer sentiment and the level of household debt. The allowance for credit losses is calculated by pooling loans of similar credit risk characteristics and applying a discounted cash flow methodology after incorporating probability of default and loss given default estimates. Probability of default represents an estimate of the likelihood of default and loss given default measures the expected loss upon default. Inputs impacting the expected losses include a forecast of macroeconomic factors, using a weighted forecast from a nationally recognized firm. Our model incorporates a one-year forecast of macroeconomic factors, after which the factors revert back to the historical mean over a one-year period. The most significant macroeconomic factor used in estimating credit losses is the national unemployment rate. The forecasted value for national unemployment at September 30, 2021 was 5.13% and during the one-year forecast period it was projected to average 5.00%, with a peak of 5.13%. Credit Quality Information As part of the on-going monitoring of credit quality within the loan portfolio, the following credit worthiness categories are used in grading our loans: Pass Acceptable levels of risk exist in the relationship. Includes all loans not classified as OAEM, substandard or doubtful. Other Assets Especially Mentioned (OAEM) Potential weaknesses that deserve management’s close attention. The potential weaknesses may result in deterioration of the repayment prospects or weaken the Company’s credit position at some future date. The credit risk may be relatively minor, yet constitute an undesirable risk in light of the circumstances surrounding the specific credit. No loss of principal or interest is expected. Substandard Well-defined weakness or a weakness that jeopardizes the repayment of the debt. A loan may be classified as substandard as a result of deterioration of the borrower’s financial condition and repayment capacity. Loans for which repayment plans have not been met or collateral equity margins do not protect the Company may also be classified as substandard. Doubtful Loans with the characteristics of substandard loans with the added characteristic that collection or liquidation in full, on the basis of presently existing facts and conditions, is highly improbable. The Company’s internal creditworthiness grading system provides a measurement of credit risk based primarily on an evaluation of the borrower’s cash flow and collateral. Category ratings are reviewed each quarter, at which time management analyzes the results, as well as other external statistics and factors related to loan performance. The following tables represent our credit risk profile by creditworthiness: September 30, 2021 Non-Pass Pass OAEM Substandard Doubtful Loss Total Non-Pass Total (dollars in thousands) Commercial, financial, agricultural and other $ 1,185,987 $ 12,318 $ 26,286 $ — $ — $ 38,604 $ 1,224,591 Time and demand 1,172,090 12,318 26,286 — — 38,604 1,210,694 Commercial credit cards 13,897 — — — — — 13,897 Real estate construction 422,668 1,294 54 — — 1,348 424,016 Residential real estate 1,867,190 1,516 6,669 — — 8,185 1,875,375 Residential first lien 1,249,248 1,444 3,450 — — 4,894 1,254,142 Residential junior lien/home equity 617,942 72 3,219 — — 3,291 621,233 Commercial real estate 2,084,476 121,883 25,531 — — 147,414 2,231,890 Multifamily 390,579 14,635 506 — — 15,141 405,720 Nonowner occupied 1,323,095 99,917 19,833 — — 119,750 1,442,845 Owner occupied 370,802 7,331 5,192 — — 12,523 383,325 Loans to individuals 976,468 — 240 — — 240 976,708 Automobile 886,183 — 184 — — 184 886,367 Consumer credit cards 10,617 — — — — — 10,617 Consumer other 79,668 — 56 — — 56 79,724 Total loans $ 6,536,789 $ 137,011 $ 58,780 $ — $ — $ 195,791 $ 6,732,580 December 31, 2020 Non-Pass Pass OAEM Substandard Doubtful Loss Total Non-Pass Total (dollars in thousands) Commercial, financial, agricultural and other $ 1,491,916 $ 48,233 $ 15,837 $ — $ — $ 64,070 $ 1,555,986 Time and demand 1,477,312 48,233 15,837 — — 64,070 1,541,382 Commercial credit cards 14,604 — — — — — 14,604 Real estate construction 426,663 504 54 — — 558 427,221 Residential real estate 1,740,992 1,902 7,698 — — 9,600 1,750,592 Residential first lien 1,138,409 1,780 4,134 — — 5,914 1,144,323 Residential junior lien/home equity 602,583 122 3,564 — — 3,686 606,269 Commercial real estate 1,983,258 175,995 52,316 — — 228,311 2,211,569 Multifamily 369,883 131 1,225 — — 1,356 371,239 Nonowner occupied 1,216,252 161,336 43,563 — — 204,899 1,421,151 Owner occupied 397,123 14,528 7,528 — — 22,056 419,179 Loans to individuals 815,541 — 274 — — 274 815,815 Automobile 712,539 — 261 — — 261 712,800 Consumer credit cards 12,360 — — — — — 12,360 Consumer other 90,642 — 13 — — 13 90,655 Total loans $ 6,458,370 $ 226,634 $ 76,179 $ — $ — $ 302,813 $ 6,761,183 The following table summarizes the loan risk rating category by loan type including term loans on an amortized cost basis by origination year: September 30, 2021 Term Loans Revolving Loans 2021 2020 2019 2018 2017 Prior Total (dollars in thousands) Time and demand $ 305,101 $ 127,699 $ 145,265 $ 100,018 $ 54,657 $ 118,361 $ 359,593 $ 1,210,694 Pass 305,081 127,623 126,211 99,050 51,866 109,244 353,015 1,172,090 OAEM — 75 1,173 816 67 7,323 2,864 12,318 Substandard 20 1 17,881 152 2,724 1,794 3,714 26,286 Commercial credit cards — — — — — — 13,897 13,897 Pass — — — — — — 13,897 13,897 Real estate construction 109,671 145,193 118,290 48,963 455 936 508 424,016 Pass 109,647 143,923 118,290 48,963 455 882 508 422,668 OAEM 24 1,270 — — — — — 1,294 Substandard — — — — — 54 — 54 Residential first lien 280,135 372,184 138,407 95,498 81,299 284,645 1,974 1,254,142 Pass 280,124 372,164 138,236 95,081 81,160 280,586 1,897 1,249,248 OAEM — — — 71 — 1,296 77 1,444 Substandard 11 20 171 346 139 2,763 — 3,450 Residential junior lien/home equity 42,602 2,207 3,682 3,038 1,161 6,297 562,246 621,233 Pass 42,602 2,207 3,604 3,038 1,161 6,141 559,189 617,942 OAEM — — — — — 62 10 72 Substandard — — 78 — — 94 3,047 3,219 Multifamily 81,608 80,628 16,466 54,180 65,075 106,420 1,343 405,720 Pass 81,608 80,628 16,466 54,180 50,974 105,380 1,343 390,579 OAEM — — — — 14,101 534 — 14,635 Substandard — — — — — 506 — 506 Nonowner occupied 113,742 111,404 198,003 163,617 195,894 655,679 4,506 1,442,845 Pass 113,742 111,404 198,003 145,792 163,703 587,138 3,313 1,323,095 OAEM — — — 17,825 25,274 55,781 1,037 99,917 Substandard — — — — 6,917 12,760 156 19,833 Owner occupied 49,257 59,485 56,875 34,738 33,796 143,789 5,385 383,325 Pass 49,257 57,858 54,392 34,212 32,449 137,363 5,271 370,802 OAEM — 1,414 1,239 526 1,323 2,796 33 7,331 Substandard — 213 1,244 — 24 3,630 81 5,192 Automobile 384,494 276,368 139,680 57,986 22,494 5,345 — 886,367 Pass 384,494 276,368 139,599 57,956 22,487 5,279 — 886,183 Substandard — — 81 30 7 66 — 184 Consumer credit cards — — — — — — 10,617 10,617 Pass — — — — — — 10,617 10,617 Consumer other 10,223 5,288 9,439 6,166 854 5,793 41,961 79,724 Pass 10,223 5,288 9,439 6,166 854 5,749 41,949 79,668 Substandard — — — — — 44 12 56 Total $ 1,376,833 $ 1,180,456 $ 826,107 $ 564,204 $ 455,685 $ 1,327,265 $ 1,002,030 $ 6,732,580 December 31, 2020 Term Loans Revolving Loans 2020 2019 2018 2017 2016 Prior Total (dollars in thousands) Time and demand $ 598,053 $ 193,601 $ 142,224 $ 72,277 $ 74,228 $ 83,313 $ 377,686 $ 1,541,382 Pass 597,405 189,834 140,473 63,137 68,007 65,418 353,038 1,477,312 OAEM 93 3,373 972 8,820 6,182 8,043 20,750 48,233 Substandard 555 394 779 320 39 9,852 3,898 15,837 Commercial credit cards — — — — — — 14,604 14,604 Pass — — — — — — 14,604 14,604 Real estate construction 150,493 133,195 104,167 34,803 389 1,009 3,165 427,221 Pass 150,493 133,195 104,167 34,803 389 709 2,907 426,663 OAEM — — — — — 246 258 504 Substandard — — — — — 54 — 54 Residential first lien 316,052 184,550 142,823 110,365 91,495 297,057 1,981 1,144,323 Pass 316,028 184,533 142,467 110,260 91,059 292,158 1,904 1,138,409 OAEM — — 83 — 100 1,520 77 1,780 Substandard 24 17 273 105 336 3,379 — 4,134 Residential junior lien/home equity 3,055 5,783 4,545 2,005 1,303 7,127 582,451 606,269 Pass 3,055 5,698 4,545 2,005 1,303 6,909 579,068 602,583 OAEM — — — — — 112 10 122 Substandard — 85 — — — 106 3,373 3,564 Multifamily 76,249 16,287 69,439 66,963 34,383 106,328 1,590 371,239 Pass 76,249 16,287 69,439 66,963 34,383 104,972 1,590 369,883 OAEM — — — — — 131 — 131 Substandard — — — — — 1,225 — 1,225 Nonowner occupied 105,861 199,280 161,018 214,915 217,883 518,052 4,142 1,421,151 Pass 105,861 190,301 139,643 181,659 175,148 419,900 3,740 1,216,252 OAEM — 8,979 21,375 26,339 37,762 66,752 129 161,336 Substandard — — — 6,917 4,973 31,400 273 43,563 Owner occupied 59,519 72,313 61,079 40,796 27,415 152,555 5,502 419,179 Pass 58,551 70,726 55,478 39,351 26,359 141,376 5,282 397,123 OAEM 968 684 4,736 1,421 114 6,572 33 14,528 Substandard — 903 865 24 942 4,607 187 7,528 Automobile 350,293 202,923 96,355 45,218 14,285 3,726 — 712,800 Pass 350,293 202,827 96,336 45,187 14,255 3,641 — 712,539 Substandard — 96 19 31 30 85 — 261 Consumer credit cards — — — — — — 12,360 12,360 Pass — — — — — — 12,360 12,360 Consumer other 7,814 14,464 10,752 1,965 711 6,383 48,566 90,655 Pass 7,814 14,464 10,752 1,965 711 6,373 48,563 90,642 Substandard — — — — — 10 3 13 Total $ 1,667,389 $ 1,022,396 $ 792,402 $ 589,307 $ 462,092 $ 1,175,550 $ 1,052,047 $ 6,761,183 Portfolio Risks The credit quality of our loan portfolio can potentially represent significant risk to our earnings, capital and liquidity. First Commonwealth devotes substantial resources to managing this risk primarily through our credit administration department that develops and administers policies and procedures for underwriting, maintaining, monitoring and collecting loans. Credit administration is independent of lending departments and oversight is provided by the Credit Committee of the First Commonwealth Board of Directors. Total net charge-offs for the nine months ended September 30, 2021 and 2020 were $9.5 million and $12.4 million, respectively. Age Analysis of Past Due Loans by Segment The following tables delineate the aging analysis of the recorded investments in past due loans as of September 30, 2021 and December 31, 2020. Also included in these tables are loans that are 90 days or more past due and still accruing because they are well-secured and in the process of collection. September 30, 2021 30 - 59 days past due 60 - 89 days past due 90 days or greater and still accruing Nonaccrual Total past due and nonaccrual Current Total (dollars in thousands) Commercial, financial, agricultural and other $ 158 $ 478 $ 33 $ 4,554 $ 5,223 $ 1,219,368 $ 1,224,591 Time and demand 23 459 — 4,554 5,036 1,205,658 1,210,694 Commercial credit cards 135 19 33 — 187 13,710 13,897 Real estate construction — — — 54 54 423,962 424,016 Residential real estate 3,354 824 411 6,046 10,635 1,864,740 1,875,375 Residential first lien 2,217 272 172 3,036 5,697 1,248,445 1,254,142 Residential junior lien/home equity 1,137 552 239 3,010 4,938 616,295 621,233 Commercial real estate 177 45 — 19,782 20,004 2,211,886 2,231,890 Multifamily — — — 435 435 405,285 405,720 Nonowner occupied 175 — — 17,783 17,958 1,424,887 1,442,845 Owner occupied 2 45 — 1,564 1,611 381,714 383,325 Loans to individuals 1,751 351 691 240 3,033 973,675 976,708 Automobile 1,363 83 158 184 1,788 884,579 886,367 Consumer credit cards 50 22 25 — 97 10,520 10,617 Consumer other 338 246 508 56 1,148 78,576 79,724 Total loans $ 5,440 $ 1,698 $ 1,135 $ 30,676 $ 38,949 $ 6,693,631 $ 6,732,580 December 31, 2020 30 - 59 days past due 60 - 89 days past due 90 days or greater and still accruing Nonaccrual Total past due and nonaccrual Current Total (dollars in thousands) Commercial, financial, agricultural and other $ 146 $ 62 $ 112 $ 3,317 $ 3,637 $ 1,552,349 $ 1,555,986 Time and demand 97 28 23 3,317 3,465 1,537,917 1,541,382 Commercial credit cards 49 34 89 — 172 14,432 14,604 Real estate construction 936 — — 54 990 426,231 427,221 Residential real estate 3,883 1,492 769 6,824 12,968 1,737,624 1,750,592 Residential first lien 1,775 660 267 3,489 6,191 1,138,132 1,144,323 Residential junior lien/home equity 2,108 832 502 3,335 6,777 599,492 606,269 Commercial real estate 237 160 3 35,072 35,472 2,176,097 2,211,569 Multifamily — — — 460 460 370,779 371,239 Nonowner occupied 18 104 — 31,822 31,944 1,389,207 1,421,151 Owner occupied 219 56 3 2,790 3,068 416,111 419,179 Loans to individuals 2,870 852 639 274 4,635 811,180 815,815 Automobile 2,090 417 94 261 2,862 709,938 712,800 Consumer credit cards 52 39 123 — 214 12,146 12,360 Consumer other 728 396 422 13 1,559 89,096 90,655 Total loans $ 8,072 $ 2,566 $ 1,523 $ 45,541 $ 57,702 $ 6,703,481 $ 6,761,183 Nonaccrual Loans The previous tables summarize nonaccrual loans by loan segment. The Company generally places loans on nonaccrual status when the full and timely collection of interest or principal becomes uncertain, when part of the principal balance has been charged off and no restructuring has occurred, or the loans reach a certain number of days past due. Generally, loans 90 days or more past due are placed on nonaccrual status, except for consumer loans, which are placed on nonaccrual status at 150 days past due. When a loan is placed on nonaccrual, the accrued unpaid interest receivable is reversed against interest income and all future payments received are applied as a reduction to the loan principal. Generally, the loan is returned to accrual status when (a) all delinquent interest and principal becomes current under the terms of the loan agreement or (b) the loan is both well-secured and in the process of collection and collectability is no longer in doubt. Nonperforming Loans Management considers loans to be nonperforming when, based on current information and events, it is determined that the Company will not be able to collect all amounts due according to the loan contract, including scheduled interest payments. Nonperforming loans include nonaccrual loans and all troubled debt restructured loans. When management identifies a loan as nonperforming, the credit loss is measured based on the present value of expected future cash flows, discounted at the loan’s effective interest rate, except when the sole source for repayment of the loan is the operation or liquidation of collateral. When the loan is collateral dependent, the appraised value less estimated cost to sell is utilized. If management determines the value of the loan is less than the recorded investment in the loan, a credit loss is recognized through an allowance estimate or a charge-off to the allowance for credit losses. When the ultimate collectability of the total principal of a nonperforming loan is in doubt and the loan is on nonaccrual status, all payments are applied to principal, under the cost recovery method. When the ultimate collectability of the total principal of a nonperforming loan is not in doubt and the loan is on nonaccrual status, contractual interest is credited to interest income when received under the cash basis method. At September 30, 2021, there were no nonperforming loans held for sale. Subsequent to September 30, 2021, as the result of a borrower initiated sale, a $6.9 million nonperforming commercial real estate loan with a $0.3 million specific reserve was sold at par. At December 31, 2020, there was one nonperforming loan totaling $13 thousand classified as held for sale. During the nine months ended September 30, 2021, a $5.0 million nonperforming relationship was transferred to held for sale and sold, resulting in a $0.4 million gain. During the nine months ended September 30, 2020, there were no gains recognized on the sale of nonperforming loans. The following tables include the recorded investment and unpaid principal balance for nonperforming loans with the associated allowance amount, if applicable, as of September 30, 2021 and December 31, 2020. Also presented are the average recorded investment in nonperforming loans and the related amount of interest recognized while the loan was considered nonperforming. Average balances are calculated using month-end balances of the loans for the period reported and are included in the table below based on their period-end allowance position. September 30, 2021 December 31, 2020 Recorded Unpaid Related Recorded Unpaid Related (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 4,836 $ 15,308 $ 2,025 $ 2,725 Time and demand 4,836 15,308 2,025 2,725 Real estate construction 54 53 54 53 Residential real estate 9,910 12,101 10,939 13,258 Residential first lien 5,599 7,003 6,062 7,575 Residential junior lien/home equity 4,311 5,098 4,877 5,683 Commercial real estate 13,176 13,981 20,650 23,641 Multifamily — — 1 82 Nonowner occupied 11,531 12,147 16,786 19,459 Owner occupied 1,645 1,834 3,863 4,100 Loans to individuals 498 537 418 447 Automobile 442 476 405 430 Consumer other 56 61 13 17 Subtotal 28,474 41,980 34,086 40,124 With an allowance recorded: Commercial, financial, agricultural and other 1,899 1,898 $ 479 4,210 9,377 $ 1,268 Time and demand 1,899 1,898 479 4,210 9,377 1,268 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — — — — — Residential junior lien/home equity — — — — — — Commercial real estate 7,713 7,794 501 15,757 15,830 3,638 Multifamily 435 456 103 459 470 116 Nonowner occupied 6,917 6,979 338 15,060 15,122 3,508 Owner occupied 361 359 60 238 238 14 Loans to individuals — — — — — — Automobile — — — — — — Consumer other — — — — — — Subtotal 9,612 9,692 980 19,967 25,207 4,906 Total $ 38,086 $ 51,672 $ 980 $ 54,053 $ 65,331 $ 4,906 For the Nine Months Ended September 30, 2021 2020 Total Loans Originated Loans Acquired Loans Average Interest Average Interest Average Interest (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 9,266 $ 50 $ 4,062 $ 15 $ 74 $ — Time and demand 9,266 50 Real estate construction 54 — 6 — 137 — Residential real estate 10,504 275 10,380 235 1,772 18 Residential first lien 5,734 210 Residential junior lien/home equity 4,770 65 Commercial real estate 20,813 101 13,994 90 1,453 76 Multifamily — — Nonowner occupied 18,050 15 Owner occupied 2,763 86 Loans to individuals 486 12 469 9 11 — Automobile 433 12 Consumer other 53 — Subtotal 41,123 438 28,911 349 3,447 94 With an allowance recorded: Commercial, financial, agricultural and other 1,820 50 4,569 45 — — Time and demand 1,820 50 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — Residential junior lien/home equity — — Commercial real estate 7,408 — 13,830 9 — — Multifamily 451 — Nonowner occupied 6,917 — Owner occupied 40 — Loans to individuals — — — — — — Automobile — — Consumer other — — Subtotal 9,228 50 18,399 54 — — Total $ 50,351 $ 488 $ 47,310 $ 403 $ 3,447 $ 94 For the Three Months Ended September 30, 2021 2020 Total Loans Originated Loans Acquired Loans Average Interest Average Interest Average Interest (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 9,858 $ 3 $ 1,918 $ 10 $ 74 $ — Time and demand 9,858 3 Real estate construction 54 — 18 — 308 — Residential real estate 10,060 54 10,198 72 1,473 1 Residential first lien 5,558 34 Residential junior lien/home equity 4,502 20 Commercial real estate 15,967 68 14,312 23 1,440 76 Multifamily — — Nonowner occupied 13,633 4 Owner occupied 2,334 64 Loans to individuals 504 6 494 3 11 — Automobile 448 6 Consumer other 56 — Subtotal 36,443 131 26,940 108 3,306 77 With an allowance recorded: Commercial, financial, agricultural and other 1,842 19 6,423 16 — — Time and demand 1,842 19 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — Residential junior lien/home equity — — Commercial real estate 7,476 — 17,407 3 — — Multifamily 439 — Nonowner occupied 6,917 — Owner occupied 120 — Loans to individuals — — — — — — Automobile — — Consumer other — — Subtotal 9,318 19 23,830 19 — — Total $ 45,761 $ 150 $ 50,770 $ 127 $ 3,306 $ 77 Unfunded commitments related to nonperforming loans were $0.2 million at both September 30, 2021 and December 31, 2020. After consideration of the requirements to draw and available collateral related to these commitments, it was determined that no reserve was required at September 30, 2021. At December 31, 2020, a reserve of $26 thousand was established for these off balance sheet exposures. Troubled debt restructured loans are those loans whose terms have been renegotiated to provide a reduction or deferral of principal or interest as a result of the financial difficulties experienced by the borrower, who could not obtain comparable terms from alternative financing sources. Troubled debt restructured loans are considered to be nonperforming loans. In March 2020, the Company began offering short-term loan modifications to assist borrowers during the COVID-19 national emergency. These modifications typically provide for the deferral of both principal and interest for 90 days. The CARES Act, along with a joint agency statement issued by banking regulators, provides that short-term modifications, meeting certain criteria and in response to COVID-19, do not need to be accounted for as a troubled debt restructured loans. Additionally, short-term loan modifications that are not accounted for as a troubled debt restructured loan, in accordance with the CARES Act, would remain classified as current during the deferral period and therefore are not reflected in the past due loan tables provided on the prior page. As of September 30, 2021, loans with an aggregate principal balance of $29.9 million were in a forbearance period granted under the CARES Act compared to $113.8 million as of December 31, 2020 and $65.4 million as of September 30, 2020. The following table provides detail as to the total troubled debt restructured loans and total commitments outstanding on troubled debt restructured loans: September 30, 2021 December 31, 2020 (dollars in thousands) Troubled debt restructured loans Accrual status $ 7,410 $ 8,512 Nonaccrual status 16,210 14,740 Total $ 23,620 $ 23,252 Commitments Letters of credit $ 60 $ 60 Unused lines of credit 15 11 Total $ 75 $ 71 The following tables provide detail, including specific reserves and reasons for modification, related to loans identified as troubled debt restructurings: For the Nine Months Ended September 30, 2021 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 6 $ — $ — $ 6,803 $ 6,803 $ 2,895 $ — Time and demand 6 — — 6,803 6,803 2,895 — Residential real estate 13 — 219 301 520 500 — Residential first lien 10 — 219 171 390 375 — Residential junior lien/home equity 3 — — 130 130 125 — Commercial real estate 2 — — 644 644 645 — Nonowner occupied 2 — — 644 644 645 — Loans to individuals 7 — 110 63 173 151 — Automobile 7 — 110 63 173 151 — Total 28 $ — $ 329 $ 7,811 $ 8,140 $ 4,191 $ — For the Nine Months Ended September 30, 2020 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 1 $ — $ 629 $ — $ 629 $ 625 $ 489 Residential real estate 16 — 33 844 877 729 — Commercial real estate 2 — — 12 12 8 — Loans to individuals 14 — 114 149 263 245 — Total 33 $ — $ 776 $ 1,005 $ 1,781 $ 1,607 $ 489 The troubled debt restructurings included in the above tables are also included in the nonperforming loan tables provided earlier in this note. Loans defined as modified due to a change in rate may include loans that were modified for a change in rate as well as a re-amortization of the principal and an extension of the maturity. For the nine months ended September 30, 2021 and 2020, $284 thousand and $766 thousand, respectively, of total rate modifications represent loans with modifications to the rate as well as payment as a result of re-amortization. For both 2021 and 2020, the changes in loan balances between the pre-modification balance and the post-modification balance are due to customer payments. The following tables provide detail, including specific reserves and reasons for modification, related to loans identified as troubled debt restructurings: For the Three Months Ended September 30, 2021 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 5 $ — $ — $ 206 $ 206 $ 202 $ — Time and demand 5 — — 206 206 202 — Residential real estate 5 — 113 117 230 221 — Residential first lien 3 — 113 — 113 109 — Residential junior lien/home equity 2 — — 117 117 112 — Commercial real estate 2 — — 644 644 645 — Nonowner occupied 2 — — 644 644 645 — Loans to individuals 3 — 17 63 80 76 — Automobile 3 — 17 63 80 76 — Total 15 $ — $ 130 $ 1,030 $ 1,160 $ 1,144 $ — For the Three Months Ended September 30, 2020 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 1 $ — $ 629 $ — $ 629 $ 625 $ 489 Residential real estate 12 — 33 580 613 477 — Loans to individuals 4 — 43 24 67 63 — Total 17 $ — $ 705 $ 604 $ 1,309 $ 1,165 $ 489 The troubled debt restructurings included in the above tables are also included in the nonperforming loan tables provided earlier in this note. Loans defined as modified due to a change in rate may include loans that were modified for a change in rate as well as a re-amortization of the principal and an extension of t
Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance	The following tables include the recorded investment and unpaid principal balance for nonperforming loans with the associated allowance amount, if applicable, as of September 30, 2021 and December 31, 2020. Also presented are the average recorded investment in nonperforming loans and the related amount of interest recognized while the loan was considered nonperforming. Average balances are calculated using month-end balances of the loans for the period reported and are included in the table below based on their period-end allowance position. September 30, 2021 December 31, 2020 Recorded Unpaid Related Recorded Unpaid Related (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 4,836 $ 15,308 $ 2,025 $ 2,725 Time and demand 4,836 15,308 2,025 2,725 Real estate construction 54 53 54 53 Residential real estate 9,910 12,101 10,939 13,258 Residential first lien 5,599 7,003 6,062 7,575 Residential junior lien/home equity 4,311 5,098 4,877 5,683 Commercial real estate 13,176 13,981 20,650 23,641 Multifamily — — 1 82 Nonowner occupied 11,531 12,147 16,786 19,459 Owner occupied 1,645 1,834 3,863 4,100 Loans to individuals 498 537 418 447 Automobile 442 476 405 430 Consumer other 56 61 13 17 Subtotal 28,474 41,980 34,086 40,124 With an allowance recorded: Commercial, financial, agricultural and other 1,899 1,898 $ 479 4,210 9,377 $ 1,268 Time and demand 1,899 1,898 479 4,210 9,377 1,268 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — — — — — Residential junior lien/home equity — — — — — — Commercial real estate 7,713 7,794 501 15,757 15,830 3,638 Multifamily 435 456 103 459 470 116 Nonowner occupied 6,917 6,979 338 15,060 15,122 3,508 Owner occupied 361 359 60 238 238 14 Loans to individuals — — — — — — Automobile — — — — — — Consumer other — — — — — — Subtotal 9,612 9,692 980 19,967 25,207 4,906 Total $ 38,086 $ 51,672 $ 980 $ 54,053 $ 65,331 $ 4,906 For the Nine Months Ended September 30, 2021 2020 Total Loans Originated Loans Acquired Loans Average Interest Average Interest Average Interest (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 9,266 $ 50 $ 4,062 $ 15 $ 74 $ — Time and demand 9,266 50 Real estate construction 54 — 6 — 137 — Residential real estate 10,504 275 10,380 235 1,772 18 Residential first lien 5,734 210 Residential junior lien/home equity 4,770 65 Commercial real estate 20,813 101 13,994 90 1,453 76 Multifamily — — Nonowner occupied 18,050 15 Owner occupied 2,763 86 Loans to individuals 486 12 469 9 11 — Automobile 433 12 Consumer other 53 — Subtotal 41,123 438 28,911 349 3,447 94 With an allowance recorded: Commercial, financial, agricultural and other 1,820 50 4,569 45 — — Time and demand 1,820 50 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — Residential junior lien/home equity — — Commercial real estate 7,408 — 13,830 9 — — Multifamily 451 — Nonowner occupied 6,917 — Owner occupied 40 — Loans to individuals — — — — — — Automobile — — Consumer other — — Subtotal 9,228 50 18,399 54 — — Total $ 50,351 $ 488 $ 47,310 $ 403 $ 3,447 $ 94 For the Three Months Ended September 30, 2021 2020 Total Loans Originated Loans Acquired Loans Average Interest Average Interest Average Interest (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 9,858 $ 3 $ 1,918 $ 10 $ 74 $ — Time and demand 9,858 3 Real estate construction 54 — 18 — 308 — Residential real estate 10,060 54 10,198 72 1,473 1 Residential first lien 5,558 34 Residential junior lien/home equity 4,502 20 Commercial real estate 15,967 68 14,312 23 1,440 76 Multifamily — — Nonowner occupied 13,633 4 Owner occupied 2,334 64 Loans to individuals 504 6 494 3 11 — Automobile 448 6 Consumer other 56 — Subtotal 36,443 131 26,940 108 3,306 77 With an allowance recorded: Commercial, financial, agricultural and other 1,842 19 6,423 16 — — Time and demand 1,842 19 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — Residential junior lien/home equity — — Commercial real estate 7,476 — 17,407 3 — — Multifamily 439 — Nonowner occupied 6,917 — Owner occupied 120 — Loans to individuals — — — — — — Automobile — — Consumer other — — Subtotal 9,318 19 23,830 19 — — Total $ 45,761 $ 150 $ 50,770 $ 127 $ 3,306 $ 77

Leases Leases

Leases Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	LeasesFirst Commonwealth has elected to apply certain practical expedients provided under ASU 2016-02 "Leases" (Topic 842) including (i) to not apply the requirements in the new standard to short-term leases (ii) to not reassess the lease classification for any expired or existing lease (iii) to account for lease and non-lease components separately (iv) to not reassess initial direct costs for any existing leases. The impact of this standard primarily relates to operating leases of certain real estate properties, including certain branch and ATM locations and office space. First Commonwealth has no material leasing arrangements for which it is the lessor of property or equipment. The following table represents the unaudited Consolidated Statements of Condition classification of the Company’s right of use ("ROU") assets and lease liabilities, lease costs and other lease information. September 30, 2021 December 31, 2020 Balance sheet: Operating lease asset classified as premises and equipment $ 40,245 $ 42,617 Operating lease liability classified as other liabilities 44,473 46,819 For the Three Months Ended For the Nine Months Ended September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 Income statement: Operating lease cost classified as occupancy and equipment expense $ 1,202 $ 1,545 $ 3,603 $ 4,281 Weighted average lease term, in years 14.36 15.10 Weighted average discount rate 3.34 % 3.42 % Operating cash flows $ 1,190 $ 2,007 The ROU assets and lease liabilities are impacted by the length of the lease term and the discount rate used to present value the minimum lease payments. First Commonwealth's lease agreements often include one or more options to renew at the Company's discretion. If we consider the renewal option to be reasonably certain, we include the extended term in the calculation of the ROU asset and lease liability. First Commonwealth uses incremental borrowing rates when calculating the lease liability because the rate implicit in the lease is not readily determinable. The incremental borrowing rate used by First Commonwealth is an amortizing loan rate obtained from the Federal Home Loan Bank ("FHLB") of Pittsburgh. This rate is consistent with a collateralized borrowing rate and is available for terms similar to the lease payment schedules. Future minimum payments for operating leases with initial or remaining terms of one year or more as of September 30, 2021 were as follows (dollars in thousands): For the twelve months ended: September 30, 2022 $ 4,623 September 30, 2023 4,591 September 30, 2024 4,428 September 30, 2025 4,306 September 30, 2026 3,849 Thereafter 35,364 Total future minimum lease payments 57,161 Less remaining imputed interest 12,688 Operating lease liability $ 44,473

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Taxes In accordance with FASB ASC Topic 740-10, “Accounting for Uncertainty in Income Taxes,” at September 30, 2021 and December 31, 2020, First Commonwealth had no material unrecognized tax benefits or accrued interest and penalties. If applicable, First Commonwealth will record interest and penalties as a component of noninterest expense. First Commonwealth is subject to routine audits of our tax returns by the Internal Revenue Service (“IRS”) as well as all states in which we conduct business. Generally, tax years prior to the year ended December 31, 2018 are no longer open to examination by federal and state taxing authorities.

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	Fair Values of Assets and Liabilities FASB ASC Topic 820, “Fair Value Measurements and Disclosures,” requires disclosures for non-financial assets and non-financial liabilities, except for items that are recognized or disclosed at fair value in the financial statements on a recurring basis (at least annually). All non-financial assets are included either as a separate line item on the unaudited Consolidated Statements of Financial Condition or in the “Other assets” category of the unaudited Consolidated Statements of Financial Condition. Currently, First Commonwealth does not have any non-financial liabilities to disclose. FASB ASC Topic 825, “Financial Instruments,” permits entities to irrevocably elect to measure select financial instruments and certain other items at fair value. The unrealized gains and losses are required to be included in earnings each reporting period for the items that fair value measurement is elected. First Commonwealth has elected not to measure any existing financial instruments at fair value under FASB ASC Topic 825; however, in the future we may elect to adopt this guidance for select financial instruments. In accordance with FASB ASC Topic 820, First Commonwealth groups financial assets and financial liabilities measured at fair value in three levels based on the principal markets in which the assets and liabilities are transacted and the observability of the data points used to determine fair value. These levels are: • Level 1 – Valuations for assets and liabilities traded in active exchange markets, such as the New York Stock Exchange (“NYSE”). Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. • Level 2 – Valuations for assets and liabilities traded in less active dealer or broker markets. Valuations are obtained for observable inputs for identical or comparable assets or liabilities from alternative pricing sources with reasonable levels of price transparency. Level 2 includes Obligations of U.S. Government securities issued by Agencies and Sponsored Enterprises, Obligations of States and Political Subdivisions, corporate securities, FHLB stock, loans held for sale, premise held for sale, interest rate derivatives (including interest rate caps, interest rate collars, interest rate swaps and risk participation agreements), certain other real estate owned and certain nonperforming loans. Level 2 investment securities are valued by a recognized third party pricing service using observable inputs. The model used by the pricing service varies by asset class and incorporates available market, trade and bid information as well as cash flow information when applicable. Because many fixed-income investment securities do not trade on a daily basis, the model uses available information such as benchmark yield curves, benchmarking of like investment securities, sector groupings and matrix pricing. The model will also use processes such as an option adjusted spread to assess the impact of interest rates and to develop prepayment estimates. Market inputs normally used in the pricing model include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including market research publications. Management validates the market values provided by the third party service by having another source price 100% of the securities on a monthly basis, monthly monitoring of variances from prior period pricing and, on a monthly basis, evaluating pricing changes compared to expectations based on changes in the financial markets. Other investments recorded in the unaudited Consolidated Statements of Financial Condition are primarily comprised of FHLB stock whose estimated fair value is based on its par value. Additional information on FHLB stock is provided in Note 6, “Investment Securities.” Loans held for sale include residential mortgage loans originated for sale in the secondary mortgage market. The estimated fair value for these loans was determined on the basis of rates obtained in the respective secondary market. Loans held for sale also include the Small Business Administration guaranteed portion of small business loans. The estimated fair value of these loans is based on the contract with the third party investor. Also included in loans held for sale are commercial loans for which fair value is determined using an executed trade or market bid obtained from potential buyers. Interest rate derivatives are reported at an estimated fair value utilizing Level 2 inputs and are included in other assets and other liabilities, and consist of interest rate swaps where there is no significant deterioration in the counterparties' and/or loan customers' credit risk since origination of the interest rate swap as well as interest rate caps, interest rate collars and risk participation agreements. First Commonwealth values its interest rate swap and cap positions using a yield curve by taking market prices/rates for an appropriate set of instruments. The set of instruments currently used to determine the U.S. Dollar yield curve includes cash LIBOR rates from overnight to one year, Eurodollar futures contracts and swap rates from one year to thirty years. These yield curves determine the valuations of interest rate swaps. Interest rate derivatives are further described in Note 11, “Derivatives.” For purposes of potential valuation adjustments to our derivative positions, First Commonwealth evaluates the credit risk of its counterparties as well as our own credit risk. Accordingly, we have considered factors such as the likelihood of default, expected loss given default, net exposures and remaining contractual life, among other things, in determining if any estimated fair value adjustments related to credit risk are required. We review our counterparty exposure quarterly, and when necessary, appropriate adjustments are made to reflect the exposure. Interest rate derivatives also include interest rate forwards entered into to hedge residential mortgage loans held for sale and the related interest-rate lock commitments. This includes forward commitments to sell mortgage loans. The fair value of these derivative financial instruments are based on derivative market data inputs as of the valuation date and the underlying value of mortgage loans for rate lock commitments. In addition, the Company hedges foreign currency risk through the use of foreign exchange forward contracts. The fair value of foreign exchange forward contracts is based on the differential between the contract price and the market-based forward rate. The estimated fair value for other real estate owned included in Level 2 is determined by either an independent market-based appraisal less estimated costs to sell or an executed sales agreement. • Level 3 – Valuations for assets and liabilities that are derived from other valuation methodologies, including option pricing models, discounted cash flow models and similar techniques, and not based on market exchange, dealer or broker traded transactions. If the inputs used to provide the valuation are unobservable and/or there is very little, if any, market activity for the security or similar securities, the securities would be considered Level 3 securities. Level 3 valuations incorporate certain assumptions and projections in determining the fair value assigned to such assets or liabilities. The assets included in Level 3 are non-marketable equity investments, certain interest rate derivatives, certain other real estate owned and certain nonperforming loans. The estimated fair value of other investments included in Level 3 is based on carrying value as these securities do not have a readily determinable fair value. The estimated fair value of limited partnership investments included in Level 3 is based on par value. For interest rate derivatives included in Level 3, the fair value incorporates credit risk by considering such factors as likelihood of default and expected loss given default based on the credit quality of the underlying counterparties (loan customers). In accordance with ASU No. 2011-4, the following table provides information related to quantitative inputs and assumptions used in Level 3 fair value measurements. Fair Value (dollars Valuation Unobservable Inputs Range / September 30, 2021 Other Investments $ 1,670 Carrying Value N/A N/A Nonperforming Loans 657 (a) Gas Reserve Study Discount rate 10.00% Gas per MMBTU $2.00 - $2.00 (b) Oil per BBL/d $50.00 - $50.00 (b) Limited Partnership Investments 14,613 Par Value N/A N/A December 31, 2020 Other Investments $ 1,670 Carrying Value N/A N/A Nonperforming Loans 798 (a) Gas Reserve Study Discount rate 10.00% Gas per MMBTU $1.46 - $1.48 (b) Oil per BBL/d $36 - $36 (b) Limited Partnership Investments 6,619 Par Value N/A N/A (a) The remainder of nonperforming loans valued using Level 3 inputs are not included in this disclosure as the values of those loans are based on bankruptcy agreement documentation. (b) Unobservable inputs are defined as follows: MMBTU - one million British thermal units; BBL/d - barrels per day. The discount rate is the significant unobservable input used in the fair value measurement of nonperforming loans. Significant increases in this rate would result in a decrease in the estimated fair value of the loans, while a decrease in this rate would result in a higher fair value measurement. Other unobservable inputs in the fair value measurement of nonperforming loans relate to gas, oil and natural gas prices. Increases in these prices would result in an increase in the estimated fair value of the loans, while a decrease in these prices would result in a lower fair value measurement. The tables below present the balances of assets and liabilities measured at fair value on a recurring basis: September 30, 2021 Level 1 Level 2 Level 3 Total (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities - Residential $ — $ 5,982 $ — $ 5,982 Mortgage-Backed Securities - Commercial — 393,707 — 393,707 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities - Residential — 685,426 — 685,426 Other Government-Sponsored Enterprises — 991 — 991 Obligations of States and Political Subdivisions — 9,610 — 9,610 Corporate Securities — 29,240 — 29,240 Total Securities Available for Sale — 1,124,956 — 1,124,956 Other Investments — 11,049 1,670 12,719 Loans Held for Sale — 19,925 — 19,925 Other Assets (a) — 34,631 14,613 49,244 Total Assets $ — $ 1,190,561 $ 16,283 $ 1,206,844 Other Liabilities (a) $ — $ 38,743 $ — $ 38,743 Total Liabilities $ — $ 38,743 $ — $ 38,743 (a) Hedging and non-hedging interest rate derivatives and limited partnership investments December 31, 2020 Level 1 Level 2 Level 3 Total (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities - Residential $ — $ 7,230 $ — $ 7,230 Mortgage-Backed Securities - Commercial — 191,180 — 191,180 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities - Residential — 496,033 — 496,033 Other Government-Sponsored Enterprises — 100,998 — 100,998 Obligations of States and Political Subdivisions — 11,397 — 11,397 Corporate Securities — 24,385 — 24,385 Total Securities Available for Sale — 831,223 — 831,223 Other Investments — 10,557 1,670 12,227 Loans Held for Sale — 33,436 — 33,436 Premises and Equipment, net — 442 — 442 Other Assets (a) — 54,362 6,619 60,981 Total Assets $ — $ 930,020 $ 8,289 $ 938,309 Other Liabilities (a) $ — $ 61,308 $ — $ 61,308 Total Liabilities $ — $ 61,308 $ — $ 61,308 (a) Hedging and non-hedging interest rate derivatives and limited partnership investments For the nine months ended September 30, changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2021 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 6,620 $ 8,290 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 8,113 8,113 Issuances — — — Sales — — — Settlements — (120) (120) Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 14,613 $ 16,283 2020 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 5,795 $ 7,465 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 751 751 Issuances — — — Sales — — — Settlements — — — Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 6,546 $ 8,216 During the nine months ended September 30, 2021 and 2020, there were no transfers between fair value Levels 1, 2 or 3. There were no gains or losses included in earnings for the periods presented that are attributable to the change in realized gains (losses) relating to assets held at September 30, 2021 and 2020. For the three months ended September 30, changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2021 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 7,448 $ 9,118 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 7,194 7,194 Issuances — — — Sales — — — Settlements — (29) (29) Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 14,613 $ 16,283 2020 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 6,406 $ 8,076 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 140 140 Issuances — — — Sales — — — Settlements — — — Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 6,546 $ 8,216 During the three months ended September 30, 2021 and 2020, there were no transfers between fair value Levels 1, 2 or 3. There were no gains or losses included in earnings for the periods presented that are attributable to the change in realized gains (losses) relating to assets held at September 30, 2021 and 2020. The tables below present the balances of assets measured at fair value on a nonrecurring basis at: September 30, 2021 Level 1 Level 2 Level 3 Total (dollars in thousands) Nonperforming loans $ — $ 24,512 $ 12,594 $ 37,106 Other real estate owned — 631 — 631 Total Assets $ — $ 25,143 $ 12,594 $ 37,737 December 31, 2020 Level 1 Level 2 Level 3 Total (dollars in thousands) Nonperforming loans $ — $ 35,543 $ 13,604 $ 49,147 Other real estate owned — 1,319 — 1,319 Total Assets $ — $ 36,862 $ 13,604 $ 50,466 The following losses were realized on the assets measured on a nonrecurring basis: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (dollars in thousands) Nonperforming loans $ (745) $ (3,695) $ (2,537) $ (9,940) Other real estate owned — (4) — (4) Total losses $ (745) $ (3,699) $ (2,537) $ (9,944) Nonperforming loans over $250 thousand are individually reviewed to determine the amount of each loan considered to be at risk of non-collection. The fair value for nonperforming loans that are collateral-based is determined by reviewing real property appraisals, equipment valuations, accounts receivable listings and other financial information. A discounted cash flow analysis is performed to determine fair value for nonperforming loans when an observable market price or a current appraisal is not available. For real estate secured loans, First Commonwealth’s loan policy requires updated appraisals be obtained at least every twelve months on all nonperforming loans with balances of $250 thousand and over. For real estate secured loans with balances under $250 thousand, we rely on broker price opinions. For non-real estate secured assets, the Company normally relies on third party valuations specific to the collateral type. The fair value for other real estate owned, determined by either an independent market-based appraisal less estimated costs to sell or an executed sales agreement, is classified as Level 2. The fair value for other real estate owned, determined using an internal valuation, is classified as Level 3. Other real estate owned has a current carrying value of $0.5 million as of September 30, 2021 and consists primarily of residential and commercial real estate properties in Pennsylvania. We review whether events and circumstances subsequent to a transfer to other real estate owned have occurred that indicate the balance of those assets may not be recoverable. If events and circumstances indicate further impairment we will record a charge to the extent that the carrying value of the assets exceed their fair values, less estimated cost to sell, as determined by valuation techniques appropriate in the circumstances. Certain other assets and liabilities, including goodwill, core deposit intangibles and customer list intangibles are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments only in certain circumstances. Additional information related to goodwill is provided in Note 12, “Goodwill.” There were no other assets or liabilities measured at fair value on a nonrecurring basis during the nine months ended September 30, 2021. FASB ASC 825-10, “Transition Related to FSP FAS 107-1” and APB 28-1, “Interim Disclosures about Fair Value of Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or nonrecurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or nonrecurring basis are as discussed above. The methodologies for other financial assets and financial liabilities are discussed below. Cash and due from banks and interest-bearing bank deposits : The carrying amounts for cash and due from banks and interest-bearing bank deposits approximate the estimated fair values of such assets. Securities : Fair values for securities available for sale and held to maturity are based on quoted market prices, if available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments. The carrying value of other investments, which includes FHLB stock and other equity investments, is considered a reasonable estimate of fair value. Loans : The fair values of all loans are estimated by discounting the estimated future cash flows using interest rates currently offered for loans with similar terms to borrowers of similar credit quality adjusted for past due and nonperforming loans. Loans held for sale : The estimated fair value of loans held for sale is based on market bids obtained from potential buyers. Off-balance sheet instruments : Many of First Commonwealth’s off-balance sheet instruments, primarily loan commitments and standby letters of credit, are expected to expire without being drawn upon; therefore, the commitment amounts do not necessarily represent future cash requirements. FASB ASC Topic 460, “Guarantees” clarified that a guarantor is required to recognize, at the inception of a guarantee, a liability for the fair value of the obligation undertaken in issuing the guarantee. The carrying amount and estimated fair value for standby letters of credit was $0.1 million at both September 30, 2021 and December 31, 2020. See Note 5, “Commitments and Contingent Liabilities,” for additional information. Deposit liabilities : The estimated fair value of demand deposits, savings accounts and money market deposits is the amount payable on demand at the reporting date because of the customers’ ability to withdraw funds immediately. The carrying value of variable rate time deposit accounts and certificates of deposit approximate their fair values at the report date. Also, fair values of fixed rate time deposits for both periods are estimated by discounting the future cash flows using interest rates currently being offered and a schedule of aggregated expected maturities. Short-term borrowings : The fair values of borrowings from the FHLB were estimated based on the estimated incremental borrowing rate for similar type borrowings. The carrying amounts of other short-term borrowings, such as federal funds purchased and securities sold under agreement to repurchase, were used to approximate fair value due to the short-term nature of the borrowings. Subordinated debt and long-term debt: The fair value is estimated by discounting the future cash flows using First Commonwealth’s estimate of the current market rate for similar types of borrowing arrangements. The following table presents carrying amounts and fair values of First Commonwealth’s financial instruments: September 30, 2021 Fair Value Measurements Using: Carrying Total Level 1 Level 2 Level 3 (dollars in thousands) Financial assets Cash and due from banks $ 94,579 $ 94,579 $ 94,579 $ — $ — Interest-bearing deposits 240,095 240,095 240,095 — — Securities available for sale 1,124,956 1,124,956 — 1,124,956 — Securities held to maturity 548,057 547,343 — 547,343 — Other investments 12,719 12,719 — 11,049 1,670 Loans held for sale 19,925 19,925 — 19,925 — Loans 6,732,580 7,118,886 — 24,512 7,094,374 Financial liabilities Deposits 7,936,485 7,936,033 — 7,936,033 — Short-term borrowings 117,754 117,602 — 117,602 — Subordinated debt 170,734 175,178 — — 175,178 Long-term debt 5,746 6,385 — 6,385 — Capital lease obligation 6,039 6,039 — 6,039 — December 31, 2020 Fair Value Measurements Using: Carrying Total Level 1 Level 2 Level 3 (dollars in thousands) Financial assets Cash and due from banks $ 100,009 $ 100,009 $ 100,009 $ — $ — Interest-bearing deposits 256,572 256,572 256,572 — — Securities available for sale 831,223 831,223 — 831,223 — Securities held to maturity 361,844 369,851 — 369,851 — Other investments 12,227 12,227 — 10,557 1,670 Loans held for sale 33,436 33,436 — 33,436 — Loans 6,761,183 7,202,763 — 35,543 7,167,220 Financial liabilities Deposits 7,438,666 7,440,906 — 7,440,906 — Short-term borrowings 117,373 117,037 — 117,037 — Subordinated debt 170,612 165,665 — — 165,665 Long-term debt 56,258 57,881 — 57,881 — Capital lease obligation 6,385 6,385 — 6,385 —

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2021
Goodwill Disclosure [Abstract]
Goodwill	GoodwillFASB ASC Topic 350-20, “Intangibles – Goodwill and Other” requires an annual valuation of the fair value of a reporting unit that has goodwill and a comparison of the fair value to the book value of equity to determine whether the goodwill has been impaired. Goodwill is also required to be tested on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. When circumstances indicate that it is more likely than not that fair value is less than carrying value, a triggering event has occurred and a quantitative impairment test would be performed. We consider First Commonwealth to be one reporting unit. The carrying amount of goodwill as both of September 30, 2021 and December 31, 2020 was $303.3 million. No impairment charges on goodwill or other intangible assets were incurred in 2021 or 2020. We test goodwill for impairment as of November 30th each year and again at any quarter-end if any material events occur during a quarter that may affect goodwill. As of September 30, 2021, no indicators of impairment were identified; however, changing economic conditions that may adversely affect our performance, the fair value of our assets and liabilities, or our stock price could result in impairment, which could adversely affect earnings in future periods. Management will continue to monitor events that could impact this conclusion in the future.

Subordinated Debentures Subordi

Subordinated Debentures Subordinated Debentures Outstanding	9 Months Ended
	Sep. 30, 2021
Subordinated Debentures Outstanding [Abstract]
Subordinated Borrowings Disclosure [Text Block]	Subordinated Debentures Subordinated debentures outstanding are as follows: September 30, 2021 December 31, 2020 Due Amount Rate Amount Rate (dollars in thousands) Owed to: First Commonwealth Bank 2028 $ 49,383 4.875% until June 1, 2023, then LIBOR + 1.845% $ 49,314 4.875% until June 1, 2023, then LIBOR + 1.845% First Commonwealth Bank 2033 49,184 5.50% until June 1, 2028, then LIBOR + 2.37% 49,131 5.50% until June 1, 2028, then LIBOR + 2.37% First Commonwealth Capital Trust II 2034 30,929 LIBOR + 2.85% 30,929 LIBOR + 2.85% First Commonwealth Capital Trust III 2034 41,238 LIBOR + 2.85% 41,238 LIBOR + 2.85% Total $ 170,734 $ 170,612 On May 21, 2018, First Commonwealth issued ten-year subordinated notes with an aggregate principal amount of $50.0 million and a fixed-to-floating rate of 4.875%. The rate remains fixed until June 1, 2023, then adjusts on a quarterly basis to three-month LIBOR + 1.845%. The Bank may redeem the notes, beginning with the interest payment due on June 1, 2023, in whole or in part at a redemption price equal to 100% of the principal amount of the subordinated notes, plus accrued and unpaid interest to the date of redemption. Deferred issuance costs of $0.9 million are being amortized on a straight-line basis over the term of the notes. On May 21, 2018, First Commonwealth issued fifteen-year subordinated notes with an aggregate principal amount of $50.0 million and a fixed-to-floating rate of 5.50%. The rate remains fixed until June 1, 2028, then adjusts on a quarterly basis to three-month LIBOR + 2.37%. The Bank may redeem the notes, beginning with the interest payment due on June 1, 2028, in whole or in part at a redemption price equal to 100% of the principal amount of the subordinated notes, plus accrued and unpaid interest to the date of redemption. Deferred issuance costs of $1.1 million are being amortized on a straight-line basis over the term of the notes. First Commonwealth currently has two trusts, First Commonwealth Capital Trust II and First Commonwealth Capital Trust III, of which 100% of the common equity is owned by First Commonwealth. The trusts were formed for the purpose of issuing company obligated mandatorily redeemable capital securities to third-party investors and investing the proceeds from the sale of the capital securities solely in junior subordinated debt securities (“subordinated debentures”) of First Commonwealth. The subordinated debentures held by each trust are the sole assets of the trust. Interest on the debentures issued to First Commonwealth Capital Trust III is paid quarterly at a floating rate of three-month LIBOR + 2.85% which is reset quarterly. Subject to regulatory approval, First Commonwealth may redeem the debentures, in whole or in part, at its option on any interest payment date at a redemption price equal to 100% of the principal amount of the debentures, plus accrued and unpaid interest to the date of the redemption. Deferred issuance costs of $0.6 million are being amortized on a straight-line basis over the term of the securities. Interest on the debentures issued to First Commonwealth Capital Trust II is paid quarterly at a floating rate of three-month LIBOR + 2.85%, which is reset quarterly. Subject to regulatory approval, First Commonwealth may redeem the debentures, in

Revenue Recognition and Deferre

Revenue Recognition and Deferred Revenue	9 Months Ended
	Sep. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract]
Revenue from Contract with Customer	Revenue Recognition Substantially all of the Company’s revenue is generated from contracts with customers. Revenue associated with financial instruments, including revenue from loans and securities, certain noninterest income streams such as fees associated with derivatives are not in scope of ASC 606 - Revenue from Contracts with Customers. ASC 606 is applicable to noninterest revenue streams such as trust income, service charges on deposits, insurance and retail brokerage commissions, card-related interchange income and gain(loss) on sale of OREO. For contracts within the scope of ASC 606, the Company immediately expenses contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less. Noninterest revenue streams in-scope of Topic 606 are discussed below: Trust Income Trust income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon a tiered scale of market value of the assets under management at month-end. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Company does not earn performance-based incentives. Optional services such as financial planning or tax return preparation services are also available to trust customers. The Company’s performance obligation for these transactional-based services is generally satisfied and related revenue recognized, at a point in time. Payment is received shortly after services are rendered. Service Charges on Deposit Accounts Service charges on deposit accounts consist of fees earned from its deposit customers for transaction-based, account maintenance, overdraft services and account analysis fees. Transaction-based fees, which include services such as ATM use fees, stop payment fees, statement rendering and ACH fees are recognized at the time the transaction is executed which is the point in time the Company fulfills the customer’s request. Monthly account maintenance fees are earned over the course of the month, representing the period over which the Company satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. The Company’s performance obligation for account analysis fees is generally satisfied, and the related revenue recognized, during the month the service is provided. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Insurance and Retail Brokerage Commissions Insurance income primarily consists of commissions received from execution of personal, business and health insurance policies when acting as an agent on behalf of insurance carriers. The Company’s performance obligation is generally satisfied upon the issuance of the insurance policy. Because the Company’s contracts with the insurance carriers are generally cancellable by either party, with minimal notice, insurance commissions are recognized during the policy period as received. Also, the majority of insurance commissions are received on a monthly basis during the policy period; however, some carriers pay the full annual commission to First Commonwealth at the time of policy issuance or renewal. In these cases, First Commonwealth would be required to refund any commissions it would not be entitled to as a result of cancelled or terminated policies. The Company has established a refund liability for the remaining term of the policies expected to be cancelled. The Company also receives incentive-based contingency fees from the insurance carriers. Contingency fee revenue, which totals approximately $0.3 million per year, is recognized as received due to the immaterial amount. Retail brokerage income primarily consists of commissions received on annuity and investment product sales through a third-party service provider. The Company’s performance obligation is generally satisfied upon the issuance of the annuity policy or the execution of an investment transaction. The Company does not earn a significant amount of trailer fees on annuity sales. However, after considering the factors impacting these trailer fees, such as the uncertainty of investor behavior and changes in the market value of assets, First Commonwealth determined that it would recognize trailing fees as received because it could not reasonably estimate an amount of future trailing commissions for which collection is probable. Commissions from the third-party service provider are received on a monthly basis based upon customer activity for the month. The fees are recognized monthly with a receivable until commissions are received from the third-party service provider the following month. Because the Company acts as an agent in arranging the relationship between the customer and the third-party service provider and does not control the services rendered to the customers, retail brokerage fees are presented net of related costs, including $2.2 million and $0.8 million in commission expense as of September 30, 2021 and 2020, respectively. Card-Related Interchange Income Card-related interchange income is primarily comprised of debit and credit card income, ATM fees and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Company’s debit and credit cards are processed through card payment networks such as MasterCard. ATM fees are primarily generated when a Company cardholder uses a non-Company ATM or a non-Company cardholder uses a Company ATM. Merchant services income mainly represents fees charged to merchants to process their debit and credit card transactions, in addition to account management fees. Card-related interchange income is recognized daily as the customer transactions are settled. Other Income Other income includes service revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. The Company’s performance obligation for these services are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Gains(losses) on sales of OREO First Commonwealth records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When First Commonwealth finances the sale of OREO to the buyer, an assessment of whether the buyer is committed to perform their obligations under the contract is completed along with an evaluation of whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon transfer of control of the property to the buyer. In determining the gain or loss on the sale, First Commonwealth adjusts the transaction price and related gain(loss) on sale if a significant financing component is present. The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (dollars in thousands) Noninterest Income In-scope of Topic 606: Trust income $ 3,118 $ 2,554 $ 8,340 $ 6,774 Service charges on deposit accounts 4,770 4,035 13,127 12,066 Insurance and retail brokerage commissions 2,218 2,156 6,368 5,982 Card-related interchange income 7,052 6,441 20,885 17,589 Gain on sale of other loans and assets 125 520 630 853 Other income 1,064 945 3,146 2,713 Noninterest Income (in-scope of Topic 606) 18,347 16,651 52,496 45,977 Noninterest Income (out-of-scope of Topic 606) 8,898 10,118 28,190 21,877 Total Noninterest Income $ 27,245 $ 26,769 $ 80,686 $ 67,854

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event On October 26, 2021, the Board of Directors authorized a new $25.0 million share repurchase program of the Company's common stock. Under the new program, management is authorized to repurchase shares through Rule 10b5-1 plans, open market purchases, privately negotiated transactions, block purchases or otherwise in a manner that is intended to comply with applicable federal securities laws, including Rule 10b-18 of the Securities Exchange Act of 1934. First Commonwealth may suspend or discontinue the program at any time. Subsequent to September 30, 2021, as the result of a borrower initiated sale, a $6.9 million nonperforming commercial real estate loan with a $0.3 million specific reserve was sold at par. This loan accounted for 22.5% of our nonperforming loans as of September 30, 2021.

Comprehensive Income Disclosure

Comprehensive Income Disclosures (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Reclassification out of Accumulated Other Comprehensive Income	The following table identifies the related tax effects allocated to each component of other comprehensive income (“OCI”) in the unaudited Consolidated Statements of Comprehensive Income. Reclassification adjustments related to securities available for sale are included in the "Net securities gains" line and reclassification adjustments related to losses on derivatives are included in the "Other operating" line in the unaudited Consolidated Statements of Income. For the Nine Months Ended September 30, 2021 2020 Pretax Amount Tax (Expense) Benefit Net of Tax Amount Pretax Amount Tax (Expense) Benefit Net of Tax Amount (dollars in thousands) Unrealized (losses) gains on securities: Unrealized holding (losses) gains on securities arising during the period $ (18,122) $ 3,805 $ (14,317) $ 22,069 $ (4,635) $ 17,434 Reclassification adjustment for gains on securities included in net income (16) 3 (13) (47) 10 (37) Total unrealized (losses) gains on securities (18,138) 3,808 (14,330) 22,022 (4,625) 17,397 Unrealized gains (losses) on derivatives: Unrealized holding gains (losses) on derivatives arising during the period 776 (163) 613 (4,892) 1,027 (3,865) Reclassification adjustment for losses on derivatives included in net income — — — — — — Total unrealized gains (losses) on derivatives 776 (163) 613 (4,892) 1,027 (3,865) Total other comprehensive (loss) income $ (17,362) $ 3,645 $ (13,717) $ 17,130 $ (3,598) $ 13,532 For the Three Months Ended September 30, 2021 2020 Pretax Amount Tax (Expense) Benefit Net of Tax Amount Pretax Amount Tax (Expense) Benefit Net of Tax Amount (dollars in thousands) Unrealized losses on securities: Unrealized holding losses on securities arising during the period $ (4,025) $ 844 $ (3,181) $ (3,256) $ 684 $ (2,572) Reclassification adjustment for gains on securities included in net income — — — (20) 4 (16) Total unrealized losses on securities (4,025) 844 (3,181) (3,276) 688 (2,588) Unrealized (losses) gains on derivatives: Unrealized holding (losses) gains on derivatives arising during the period (529) 111 (418) 225 (48) 177 Reclassification adjustment for losses on derivatives included in net income — — — — — — Total unrealized (losses) gains on derivatives (529) 111 (418) 225 (48) 177 Total other comprehensive loss $ (4,554) $ 955 $ (3,599) $ (3,051) $ 640 $ (2,411)
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table details the change in components of OCI for the nine months ended September 30: 2021 2020 Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) (dollars in thousands) Balance at December 31 $ 20,310 $ (182) $ (2,895) $ 17,233 $ 4,580 $ 365 $ 634 $ 5,579 Other comprehensive (loss) income before reclassification adjustment (14,317) — 613 (13,704) 17,434 — (3,865) 13,569 Amounts reclassified from accumulated other comprehensive (loss) income (13) — — (13) (37) — — (37) Net other comprehensive (loss) income during the period (14,330) — 613 (13,717) 17,397 — (3,865) 13,532 Balance at September 30 $ 5,980 $ (182) $ (2,282) $ 3,516 $ 21,977 $ 365 $ (3,231) $ 19,111 The following table details the change in components of OCI for the three months ended September 30: 2021 2020 Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) Securities Available for Sale Post-Retirement Obligation Derivatives Accumulated Other Comprehensive Income (Loss) (dollars in thousands) Balance at June 30 $ 9,161 $ (182) $ (1,864) $ 7,115 $ 24,565 $ 365 $ (3,408) $ 21,522 Other comprehensive loss before reclassification adjustment (3,181) — (418) (3,599) (2,572) — 177 (2,395) Amounts reclassified from accumulated other comprehensive (loss) income — — — — (16) — — (16) Net other comprehensive loss during the period (3,181) — (418) (3,599) (2,588) — 177 (2,411) Balance at September 30 $ 5,980 $ (182) $ (2,282) $ 3,516 $ 21,977 $ 365 $ (3,231) $ 19,111

Supplemental Cash Flow Note (Ta

Supplemental Cash Flow Note (Tables)	9 Months Ended
	Sep. 30, 2021
Supplemental Cash Flow Information [Abstract]
Schedule of Supplemental Cash Flow Disclosures	The following table presents information related to cash paid during the period for interest and income taxes, as well as detail on non-cash investing and financing activities for the nine months ended September 30: 2021 2020 (dollars in thousands) Cash paid during the period for: Interest $ 11,039 $ 26,687 Income taxes 22,374 16,207 Non-cash investing and financing activities: Loans transferred to other real estate owned and repossessed assets 2,533 3,206 Loans transferred from held to maturity to held for sale 55,700 27,391 Loans transferred from available for sale to held to maturity — 1,908 Gross (decrease) increase in market value adjustment to securities available for sale (18,138) 22,022 Gross increase (decrease) in market value adjustment to derivatives 776 (4,892) Investments committed to purchase, not settled — 22,644 Increase in limited partnership investment unfunded commitment 6,929 — Noncash treasury stock reissuance 2,042 1,594 Unsettled treasury stock repurchases 680 — Proceeds from death benefit on bank owned life insurance not received (384) (384)

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share	The following table summarizes the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computations: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Weighted average common shares issued 113,914,902 113,914,902 113,914,902 113,914,902 Average treasury stock shares (18,103,611) (15,821,469) (17,840,694) (15,761,114) Average deferred compensation shares (55,615) (45,454) (55,581) (41,790) Average unearned nonvested shares (139,255) (130,883) (134,759) (121,249) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 95,616,421 97,917,096 95,883,868 97,990,749 Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share 220,268 197,545 191,119 188,255 Additional common stock equivalents (deferred compensation) used to calculate diluted earnings per share 55,615 45,502 55,615 45,502 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 95,892,304 98,160,143 96,130,602 98,224,506 Basic Earnings per Share $ 0.36 $ 0.20 $ 1.08 $ 0.49 Diluted Earnings per Share $ 0.36 $ 0.20 $ 1.08 $ 0.49
Common Stock Equivalents Not Included in Computation of Diluted Earnings Per Share	The following table shows the number of shares and the price per share related to common stock equivalents that were not included in the computation of diluted earnings per share for the nine months ended September 30 because to do so would have been antidilutive. 2021 2020 Price Range Price Range Shares From To Shares From To Restricted Stock 111,589 $ 12.77 $ 14.58 110,068 $ 13.72 $ 15.44 Restricted Stock Units 29,547 $ 16.41 $ 16.41 102,844 $ 12.43 $ 15.37

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Notional Amount of Outstanding Commitments	The following table identifies the notional amount of those instruments at: September 30, 2021 December 31, 2020 (dollars in thousands) Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 2,270,058 $ 2,097,628 Financial standby letters of credit 15,914 15,988 Performance standby letters of credit 11,233 16,864 Commercial letters of credit 975 783

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investment Securities [Abstract]
Analysis of Amortized Cost and Estimated Fair Value of Securities Available for Sale	Below is an analysis of the amortized cost and estimated fair values of securities available for sale at: September 30, 2021 December 31, 2020 Amortized Gross Gross Estimated Amortized Gross Gross Estimated (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities – Residential $ 5,448 $ 534 $ — $ 5,982 $ 6,492 $ 738 $ — $ 7,230 Mortgage-Backed Securities – Commercial 390,566 4,588 (1,447) 393,707 182,823 8,357 — 191,180 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential 682,677 9,296 (6,547) 685,426 481,109 14,924 — 496,033 Other Government-Sponsored Enterprises 1,000 — (9) 991 100,996 2 — 100,998 Obligations of States and Political Subdivisions 9,586 105 (81) 9,610 11,154 243 — 11,397 Corporate Securities 28,107 1,173 (40) 29,240 22,941 1,444 — 24,385 Total Securities Available for Sale $ 1,117,384 $ 15,696 $ (8,124) $ 1,124,956 $ 805,515 $ 25,708 $ — $ 831,223
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale	The amortized cost and estimated fair value of debt securities available for sale at September 30, 2021, by contractual maturity, are shown below. Amortized Estimated (dollars in thousands) Due within 1 year $ 5,000 $ 5,027 Due after 1 but within 5 years 13,872 14,498 Due after 5 but within 10 years 19,821 20,316 Due after 10 years — — 38,693 39,841 Mortgage-Backed Securities (a) 1,078,691 1,085,115 Total Debt Securities $ 1,117,384 $ 1,124,956	[1]
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale	Proceeds from sales, gross gains (losses) realized on sales and maturities related to securities held to maturity and securities available for sale were as follows for the nine months ended September 30: 2021 2020 (dollars in thousands) Proceeds from sales $ — $ — Gross gains (losses) realized: Sales transactions: Gross gains $ — $ — Gross losses — — — — Maturities Gross gains 16 47 Gross losses — — 16 47 Net gains $ 16 $ 47
Debt Securities, Held-to-maturity [Table Text Block]	Below is an analysis of the amortized cost and fair values of debt securities held to maturity at: September 30, 2021 December 31, 2020 Amortized Gross Gross Estimated Amortized Gross Gross Estimated (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities – Residential $ 2,432 $ 125 $ — $ 2,557 $ 2,766 $ 138 $ — $ 2,904 Mortgage-Backed Securities- Commercial 96,228 590 (834) 95,984 36,799 1,441 — 38,240 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential 387,399 3,832 (4,303) 386,928 277,351 5,389 (10) 282,730 Mortgage-Backed Securities – Commercial 7,927 235 — 8,162 9,737 344 — 10,081 Other Government-Sponsored Enterprises 21,825 — (726) 21,099 — — — — Obligations of States and Political Subdivisions 31,246 461 (94) 31,613 34,391 705 — 35,096 Debt Securities Issued by Foreign Governments 1,000 — — 1,000 800 — — 800 Total Securities Held to Maturity $ 548,057 $ 5,243 $ (5,957) $ 547,343 $ 361,844 $ 8,017 $ (10) $ 369,851
Schedule of Held-to-Maturity Securities by Maturity [Table Text Block]	The amortized cost and estimated fair value of debt securities held to maturity at September 30, 2021, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Amortized Estimated (dollars in thousands) Due within 1 year $ 1,800 $ 1,807 Due after 1 but within 5 years 5,568 5,616 Due after 5 but within 10 years 43,207 42,769 Due after 10 years 3,496 3,520 54,071 53,712 Mortgage-Backed Securities (a) 493,986 493,631 Total Debt Securities $ 548,057 $ 547,343 (a) Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $98.7 million and a fair value of $98.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $395.3 million and a fair value of $395.1 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.
Schedule of Temporary Impairment Losses, Investments	The following table presents the gross unrealized losses and estimated fair values at September 30, 2021 for both available for sale and held to maturity securities by investment category and time frame for which securities have been in a continuous unrealized loss position: Less Than 12 Months 12 Months or More Total Estimated Gross Estimated Gross Estimated Gross (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities – Commercial $ 213,203 $ (2,281) $ — $ — $ 213,203 $ (2,281) Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential 640,235 (10,850) — — 640,235 (10,850) Other Government-Sponsored Enterprises 22,090 (735) — — 22,090 (735) Obligations of States and Political Subdivisions 13,798 (175) — — 13,798 (175) Corporate Securities 5,111 (40) — — 5,111 (40) Total Securities $ 894,437 $ (14,081) $ — $ — $ 894,437 $ (14,081) At September 30, 2021, fixed income securities issued by the U.S. Government and U.S. Government-sponsored enterprises comprised 98% of total unrealized losses due to changes in market interest rates. At September 30, 2021, there are 52 debt securities in an unrealized loss position. The following table presents the gross unrealized losses and estimated fair values at December 31, 2020 by investment category and time frame for which securities have been in a continuous unrealized loss position: Less Than 12 Months 12 Months or More Total Estimated Gross Estimated Gross Estimated Gross (dollars in thousands) Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities – Residential $ 3,755 $ (10) $ — $ — $ 3,755 $ (10) Total Securities $ 3,755 $ (10) $ — $ — $ 3,755 $ (10)
[1]	Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $98.7 million and a fair value of $98.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $395.3 million and a fair value of $395.1 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Outstanding Balances of Loan	The following table provides outstanding balances related to each of our loan types: September 30, 2021 December 31, 2020 (dollars in thousands) Commercial, financial, agricultural and other $ 1,224,591 $ 1,555,986 Time and demand 1,210,694 1,541,382 Commercial credit cards 13,897 14,604 Real estate construction 424,016 427,221 Residential real estate 1,875,375 1,750,592 Residential first lien 1,254,142 1,144,323 Residential junior lien/home equity 621,233 606,269 Commercial real estate 2,231,890 2,211,569 Multifamily 405,720 371,239 Nonowner occupied 1,442,845 1,421,151 Owner occupied 383,325 419,179 Loans to individuals 976,708 815,815 Automobile 886,367 712,800 Consumer credit cards 10,617 12,360 Consumer other 79,724 90,655 Total loans $ 6,732,580 $ 6,761,183
Credit Risk Profile by Creditworthiness	The following tables represent our credit risk profile by creditworthiness: September 30, 2021 Non-Pass Pass OAEM Substandard Doubtful Loss Total Non-Pass Total (dollars in thousands) Commercial, financial, agricultural and other $ 1,185,987 $ 12,318 $ 26,286 $ — $ — $ 38,604 $ 1,224,591 Time and demand 1,172,090 12,318 26,286 — — 38,604 1,210,694 Commercial credit cards 13,897 — — — — — 13,897 Real estate construction 422,668 1,294 54 — — 1,348 424,016 Residential real estate 1,867,190 1,516 6,669 — — 8,185 1,875,375 Residential first lien 1,249,248 1,444 3,450 — — 4,894 1,254,142 Residential junior lien/home equity 617,942 72 3,219 — — 3,291 621,233 Commercial real estate 2,084,476 121,883 25,531 — — 147,414 2,231,890 Multifamily 390,579 14,635 506 — — 15,141 405,720 Nonowner occupied 1,323,095 99,917 19,833 — — 119,750 1,442,845 Owner occupied 370,802 7,331 5,192 — — 12,523 383,325 Loans to individuals 976,468 — 240 — — 240 976,708 Automobile 886,183 — 184 — — 184 886,367 Consumer credit cards 10,617 — — — — — 10,617 Consumer other 79,668 — 56 — — 56 79,724 Total loans $ 6,536,789 $ 137,011 $ 58,780 $ — $ — $ 195,791 $ 6,732,580 December 31, 2020 Non-Pass Pass OAEM Substandard Doubtful Loss Total Non-Pass Total (dollars in thousands) Commercial, financial, agricultural and other $ 1,491,916 $ 48,233 $ 15,837 $ — $ — $ 64,070 $ 1,555,986 Time and demand 1,477,312 48,233 15,837 — — 64,070 1,541,382 Commercial credit cards 14,604 — — — — — 14,604 Real estate construction 426,663 504 54 — — 558 427,221 Residential real estate 1,740,992 1,902 7,698 — — 9,600 1,750,592 Residential first lien 1,138,409 1,780 4,134 — — 5,914 1,144,323 Residential junior lien/home equity 602,583 122 3,564 — — 3,686 606,269 Commercial real estate 1,983,258 175,995 52,316 — — 228,311 2,211,569 Multifamily 369,883 131 1,225 — — 1,356 371,239 Nonowner occupied 1,216,252 161,336 43,563 — — 204,899 1,421,151 Owner occupied 397,123 14,528 7,528 — — 22,056 419,179 Loans to individuals 815,541 — 274 — — 274 815,815 Automobile 712,539 — 261 — — 261 712,800 Consumer credit cards 12,360 — — — — — 12,360 Consumer other 90,642 — 13 — — 13 90,655 Total loans $ 6,458,370 $ 226,634 $ 76,179 $ — $ — $ 302,813 $ 6,761,183
Credit Risk Profile Vintage by Creditworthiness	The following table summarizes the loan risk rating category by loan type including term loans on an amortized cost basis by origination year: September 30, 2021 Term Loans Revolving Loans 2021 2020 2019 2018 2017 Prior Total (dollars in thousands) Time and demand $ 305,101 $ 127,699 $ 145,265 $ 100,018 $ 54,657 $ 118,361 $ 359,593 $ 1,210,694 Pass 305,081 127,623 126,211 99,050 51,866 109,244 353,015 1,172,090 OAEM — 75 1,173 816 67 7,323 2,864 12,318 Substandard 20 1 17,881 152 2,724 1,794 3,714 26,286 Commercial credit cards — — — — — — 13,897 13,897 Pass — — — — — — 13,897 13,897 Real estate construction 109,671 145,193 118,290 48,963 455 936 508 424,016 Pass 109,647 143,923 118,290 48,963 455 882 508 422,668 OAEM 24 1,270 — — — — — 1,294 Substandard — — — — — 54 — 54 Residential first lien 280,135 372,184 138,407 95,498 81,299 284,645 1,974 1,254,142 Pass 280,124 372,164 138,236 95,081 81,160 280,586 1,897 1,249,248 OAEM — — — 71 — 1,296 77 1,444 Substandard 11 20 171 346 139 2,763 — 3,450 Residential junior lien/home equity 42,602 2,207 3,682 3,038 1,161 6,297 562,246 621,233 Pass 42,602 2,207 3,604 3,038 1,161 6,141 559,189 617,942 OAEM — — — — — 62 10 72 Substandard — — 78 — — 94 3,047 3,219 Multifamily 81,608 80,628 16,466 54,180 65,075 106,420 1,343 405,720 Pass 81,608 80,628 16,466 54,180 50,974 105,380 1,343 390,579 OAEM — — — — 14,101 534 — 14,635 Substandard — — — — — 506 — 506 Nonowner occupied 113,742 111,404 198,003 163,617 195,894 655,679 4,506 1,442,845 Pass 113,742 111,404 198,003 145,792 163,703 587,138 3,313 1,323,095 OAEM — — — 17,825 25,274 55,781 1,037 99,917 Substandard — — — — 6,917 12,760 156 19,833 Owner occupied 49,257 59,485 56,875 34,738 33,796 143,789 5,385 383,325 Pass 49,257 57,858 54,392 34,212 32,449 137,363 5,271 370,802 OAEM — 1,414 1,239 526 1,323 2,796 33 7,331 Substandard — 213 1,244 — 24 3,630 81 5,192 Automobile 384,494 276,368 139,680 57,986 22,494 5,345 — 886,367 Pass 384,494 276,368 139,599 57,956 22,487 5,279 — 886,183 Substandard — — 81 30 7 66 — 184 Consumer credit cards — — — — — — 10,617 10,617 Pass — — — — — — 10,617 10,617 Consumer other 10,223 5,288 9,439 6,166 854 5,793 41,961 79,724 Pass 10,223 5,288 9,439 6,166 854 5,749 41,949 79,668 Substandard — — — — — 44 12 56 Total $ 1,376,833 $ 1,180,456 $ 826,107 $ 564,204 $ 455,685 $ 1,327,265 $ 1,002,030 $ 6,732,580
Age Analysis of Past Due Loans by Segment	The following tables delineate the aging analysis of the recorded investments in past due loans as of September 30, 2021 and December 31, 2020. Also included in these tables are loans that are 90 days or more past due and still accruing because they are well-secured and in the process of collection. September 30, 2021 30 - 59 days past due 60 - 89 days past due 90 days or greater and still accruing Nonaccrual Total past due and nonaccrual Current Total (dollars in thousands) Commercial, financial, agricultural and other $ 158 $ 478 $ 33 $ 4,554 $ 5,223 $ 1,219,368 $ 1,224,591 Time and demand 23 459 — 4,554 5,036 1,205,658 1,210,694 Commercial credit cards 135 19 33 — 187 13,710 13,897 Real estate construction — — — 54 54 423,962 424,016 Residential real estate 3,354 824 411 6,046 10,635 1,864,740 1,875,375 Residential first lien 2,217 272 172 3,036 5,697 1,248,445 1,254,142 Residential junior lien/home equity 1,137 552 239 3,010 4,938 616,295 621,233 Commercial real estate 177 45 — 19,782 20,004 2,211,886 2,231,890 Multifamily — — — 435 435 405,285 405,720 Nonowner occupied 175 — — 17,783 17,958 1,424,887 1,442,845 Owner occupied 2 45 — 1,564 1,611 381,714 383,325 Loans to individuals 1,751 351 691 240 3,033 973,675 976,708 Automobile 1,363 83 158 184 1,788 884,579 886,367 Consumer credit cards 50 22 25 — 97 10,520 10,617 Consumer other 338 246 508 56 1,148 78,576 79,724 Total loans $ 5,440 $ 1,698 $ 1,135 $ 30,676 $ 38,949 $ 6,693,631 $ 6,732,580 December 31, 2020 30 - 59 days past due 60 - 89 days past due 90 days or greater and still accruing Nonaccrual Total past due and nonaccrual Current Total (dollars in thousands) Commercial, financial, agricultural and other $ 146 $ 62 $ 112 $ 3,317 $ 3,637 $ 1,552,349 $ 1,555,986 Time and demand 97 28 23 3,317 3,465 1,537,917 1,541,382 Commercial credit cards 49 34 89 — 172 14,432 14,604 Real estate construction 936 — — 54 990 426,231 427,221 Residential real estate 3,883 1,492 769 6,824 12,968 1,737,624 1,750,592 Residential first lien 1,775 660 267 3,489 6,191 1,138,132 1,144,323 Residential junior lien/home equity 2,108 832 502 3,335 6,777 599,492 606,269 Commercial real estate 237 160 3 35,072 35,472 2,176,097 2,211,569 Multifamily — — — 460 460 370,779 371,239 Nonowner occupied 18 104 — 31,822 31,944 1,389,207 1,421,151 Owner occupied 219 56 3 2,790 3,068 416,111 419,179 Loans to individuals 2,870 852 639 274 4,635 811,180 815,815 Automobile 2,090 417 94 261 2,862 709,938 712,800 Consumer credit cards 52 39 123 — 214 12,146 12,360 Consumer other 728 396 422 13 1,559 89,096 90,655 Total loans $ 8,072 $ 2,566 $ 1,523 $ 45,541 $ 57,702 $ 6,703,481 $ 6,761,183
Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance	The following tables include the recorded investment and unpaid principal balance for nonperforming loans with the associated allowance amount, if applicable, as of September 30, 2021 and December 31, 2020. Also presented are the average recorded investment in nonperforming loans and the related amount of interest recognized while the loan was considered nonperforming. Average balances are calculated using month-end balances of the loans for the period reported and are included in the table below based on their period-end allowance position. September 30, 2021 December 31, 2020 Recorded Unpaid Related Recorded Unpaid Related (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 4,836 $ 15,308 $ 2,025 $ 2,725 Time and demand 4,836 15,308 2,025 2,725 Real estate construction 54 53 54 53 Residential real estate 9,910 12,101 10,939 13,258 Residential first lien 5,599 7,003 6,062 7,575 Residential junior lien/home equity 4,311 5,098 4,877 5,683 Commercial real estate 13,176 13,981 20,650 23,641 Multifamily — — 1 82 Nonowner occupied 11,531 12,147 16,786 19,459 Owner occupied 1,645 1,834 3,863 4,100 Loans to individuals 498 537 418 447 Automobile 442 476 405 430 Consumer other 56 61 13 17 Subtotal 28,474 41,980 34,086 40,124 With an allowance recorded: Commercial, financial, agricultural and other 1,899 1,898 $ 479 4,210 9,377 $ 1,268 Time and demand 1,899 1,898 479 4,210 9,377 1,268 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — — — — — Residential junior lien/home equity — — — — — — Commercial real estate 7,713 7,794 501 15,757 15,830 3,638 Multifamily 435 456 103 459 470 116 Nonowner occupied 6,917 6,979 338 15,060 15,122 3,508 Owner occupied 361 359 60 238 238 14 Loans to individuals — — — — — — Automobile — — — — — — Consumer other — — — — — — Subtotal 9,612 9,692 980 19,967 25,207 4,906 Total $ 38,086 $ 51,672 $ 980 $ 54,053 $ 65,331 $ 4,906 For the Nine Months Ended September 30, 2021 2020 Total Loans Originated Loans Acquired Loans Average Interest Average Interest Average Interest (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 9,266 $ 50 $ 4,062 $ 15 $ 74 $ — Time and demand 9,266 50 Real estate construction 54 — 6 — 137 — Residential real estate 10,504 275 10,380 235 1,772 18 Residential first lien 5,734 210 Residential junior lien/home equity 4,770 65 Commercial real estate 20,813 101 13,994 90 1,453 76 Multifamily — — Nonowner occupied 18,050 15 Owner occupied 2,763 86 Loans to individuals 486 12 469 9 11 — Automobile 433 12 Consumer other 53 — Subtotal 41,123 438 28,911 349 3,447 94 With an allowance recorded: Commercial, financial, agricultural and other 1,820 50 4,569 45 — — Time and demand 1,820 50 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — Residential junior lien/home equity — — Commercial real estate 7,408 — 13,830 9 — — Multifamily 451 — Nonowner occupied 6,917 — Owner occupied 40 — Loans to individuals — — — — — — Automobile — — Consumer other — — Subtotal 9,228 50 18,399 54 — — Total $ 50,351 $ 488 $ 47,310 $ 403 $ 3,447 $ 94 For the Three Months Ended September 30, 2021 2020 Total Loans Originated Loans Acquired Loans Average Interest Average Interest Average Interest (dollars in thousands) With no related allowance recorded: Commercial, financial, agricultural and other $ 9,858 $ 3 $ 1,918 $ 10 $ 74 $ — Time and demand 9,858 3 Real estate construction 54 — 18 — 308 — Residential real estate 10,060 54 10,198 72 1,473 1 Residential first lien 5,558 34 Residential junior lien/home equity 4,502 20 Commercial real estate 15,967 68 14,312 23 1,440 76 Multifamily — — Nonowner occupied 13,633 4 Owner occupied 2,334 64 Loans to individuals 504 6 494 3 11 — Automobile 448 6 Consumer other 56 — Subtotal 36,443 131 26,940 108 3,306 77 With an allowance recorded: Commercial, financial, agricultural and other 1,842 19 6,423 16 — — Time and demand 1,842 19 Real estate construction — — — — — — Residential real estate — — — — — — Residential first lien — — Residential junior lien/home equity — — Commercial real estate 7,476 — 17,407 3 — — Multifamily 439 — Nonowner occupied 6,917 — Owner occupied 120 — Loans to individuals — — — — — — Automobile — — Consumer other — — Subtotal 9,318 19 23,830 19 — — Total $ 45,761 $ 150 $ 50,770 $ 127 $ 3,306 $ 77
Troubled Debt Restructured Loans and Commitments	The following table provides detail as to the total troubled debt restructured loans and total commitments outstanding on troubled debt restructured loans: September 30, 2021 December 31, 2020 (dollars in thousands) Troubled debt restructured loans Accrual status $ 7,410 $ 8,512 Nonaccrual status 16,210 14,740 Total $ 23,620 $ 23,252 Commitments Letters of credit $ 60 $ 60 Unused lines of credit 15 11 Total $ 75 $ 71
Financing Receivable, New Troubled Debt Restructuring	The following tables provide detail, including specific reserves and reasons for modification, related to loans identified as troubled debt restructurings: For the Nine Months Ended September 30, 2021 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 6 $ — $ — $ 6,803 $ 6,803 $ 2,895 $ — Time and demand 6 — — 6,803 6,803 2,895 — Residential real estate 13 — 219 301 520 500 — Residential first lien 10 — 219 171 390 375 — Residential junior lien/home equity 3 — — 130 130 125 — Commercial real estate 2 — — 644 644 645 — Nonowner occupied 2 — — 644 644 645 — Loans to individuals 7 — 110 63 173 151 — Automobile 7 — 110 63 173 151 — Total 28 $ — $ 329 $ 7,811 $ 8,140 $ 4,191 $ — For the Nine Months Ended September 30, 2020 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 1 $ — $ 629 $ — $ 629 $ 625 $ 489 Residential real estate 16 — 33 844 877 729 — Commercial real estate 2 — — 12 12 8 — Loans to individuals 14 — 114 149 263 245 — Total 33 $ — $ 776 $ 1,005 $ 1,781 $ 1,607 $ 489 The following tables provide detail, including specific reserves and reasons for modification, related to loans identified as troubled debt restructurings: For the Three Months Ended September 30, 2021 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 5 $ — $ — $ 206 $ 206 $ 202 $ — Time and demand 5 — — 206 206 202 — Residential real estate 5 — 113 117 230 221 — Residential first lien 3 — 113 — 113 109 — Residential junior lien/home equity 2 — — 117 117 112 — Commercial real estate 2 — — 644 644 645 — Nonowner occupied 2 — — 644 644 645 — Loans to individuals 3 — 17 63 80 76 — Automobile 3 — 17 63 80 76 — Total 15 $ — $ 130 $ 1,030 $ 1,160 $ 1,144 $ — For the Three Months Ended September 30, 2020 Type of Modification Number Extend Modify Modify Total Post- Specific (dollars in thousands) Commercial, financial, agricultural and other 1 $ — $ 629 $ — $ 629 $ 625 $ 489 Residential real estate 12 — 33 580 613 477 — Loans to individuals 4 — 43 24 67 63 — Total 17 $ — $ 705 $ 604 $ 1,309 $ 1,165 $ 489
Troubled Debt Restructuring Subsequent Default [Table Text Block]	A troubled debt restructuring is considered to be in default when a restructured loan is 90 days or more past due. The following table provides information related to loans that were restructured within the past twelve months and that were considered to be in default during the nine months ended September 30: 2021 2020 Number of Recorded Number of Recorded (dollars in thousands) Residential real estate — $ — 1 $ 50 Commercial real estate — — 1 112 Loans to individuals — — 2 78 Total — $ — 4 $ 240 The following table provides information related to loans that were restructured within the past twelve months and that were considered to be in default during the three months ended September 30: 2021 2020 Number of Recorded Number of Recorded (dollars in thousands) Commercial real estate — $ — 1 $ 112 Loans to individuals — — 2 78 Total — $ — 3 $ 190
Allowance for Credit Losses	The following tables provide detail related to the allowance for credit losses: For the Nine Months Ended September 30, 2021 Beginning balance Charge-offs Recoveries Provision (credit) a Ending balance (dollars in thousands) Commercial, financial, agricultural and other $ 17,187 $ (6,522) $ 299 $ 6,898 $ 17,862 Time and demand 16,838 (6,397) 292 6,849 17,582 Commercial credit cards 349 (125) 7 49 280 Real estate construction 7,966 — 135 (3,768) 4,333 Residential real estate 14,358 (130) 309 (1,732) 12,805 Residential first lien 7,919 (36) 206 (632) 7,457 Residential junior lien/home equity 6,439 (94) 103 (1,100) 5,348 Commercial real estate 41,953 (1,659) 130 (5,784) 34,640 Multifamily 6,240 (1) — (2,408) 3,831 Nonowner occupied 28,414 (1,556) 120 (880) 26,098 Owner occupied 7,299 (102) 10 (2,496) 4,711 Loans to individuals 19,845 (3,199) 1,163 6,736 24,545 Automobile 16,133 (1,399) 826 5,642 21,202 Consumer credit cards 635 (372) 51 182 496 Consumer other 3,077 (1,428) 286 912 2,847 Total loans $ 101,309 $ (11,510) $ 2,036 $ 2,350 $ 94,185 a) The provision expense(credit) shown here excludes the provision for off-balance sheet credit exposure included in the income statement. For the Nine Months Ended September 30, 2021 Loans Ending balance Ending balance: individually evaluated for credit losses Ending balance: collectively evaluated for credit losses Ending balance Ending balance: individually evaluated for credit losses Ending balance: collectively evaluated for credit losses (dollars in thousands) Commercial, financial, agricultural and other $ 17,862 $ 479 $ 17,383 $ 1,224,591 $ 5,561 $ 1,219,030 Time and demand 17,582 479 17,103 1,210,694 5,561 1,205,133 Commercial credit cards 280 — 280 13,897 — 13,897 Real estate construction 4,333 — 4,333 424,016 — 424,016 Residential real estate 12,805 — 12,805 1,875,375 254 1,875,121 Residential first lien 7,457 — 7,457 1,254,142 — 1,254,142 Residential junior lien/home equity 5,348 — 5,348 621,233 254 620,979 Commercial real estate 34,640 501 34,139 2,231,890 20,333 2,211,557 Multifamily 3,831 103 3,728 405,720 435 405,285 Nonowner occupied 26,098 338 25,760 1,442,845 18,314 1,424,531 Owner occupied 4,711 60 4,651 383,325 1,584 381,741 Loans to individuals 24,545 — 24,545 976,708 — 976,708 Automobile 21,202 — 21,202 886,367 — 886,367 Consumer credit cards 496 — 496 10,617 — 10,617 Consumer other 2,847 — 2,847 79,724 — 79,724 Total loans $ 94,185 $ 980 $ 93,205 $ 6,732,580 $ 26,148 $ 6,706,432 For the Nine Months Ended September 30, 2020 Commercial, Real estate Residential Commercial Loans to Total (dollars in thousands) Allowance for credit losses: Originated loans: Beginning balance $ 20,221 $ 2,558 $ 4,091 $ 19,731 $ 4,984 $ 51,585 Charge-offs (5,166) — (720) (2,415) (4,958) (13,259) Recoveries 161 26 274 154 702 1,317 Provision (credit) 9,936 924 4,607 23,132 8,087 46,686 Ending balance 25,152 3,508 8,252 40,602 8,815 86,329 Acquired loans: Beginning balance 13 — 2 37 — 52 Charge-offs — — (213) (2) (287) (502) Recoveries 28 — 38 — 10 76 Provision (credit) 295 — 173 1,607 277 2,352 Ending balance 336 — — 1,642 — 1,978 Total ending balance $ 25,488 $ 3,508 $ 8,252 $ 42,244 $ 8,815 $ 88,307 Ending balance: individually evaluated for impairment $ 1,497 $ — $ — $ 5,921 $ — $ 7,418 Ending balance: collectively evaluated for impairment 23,991 3,508 8,252 36,323 8,815 80,889 Loans: Ending balance 1,736,736 452,989 1,744,020 2,215,311 800,660 6,949,716 Ending balance: individually evaluated for impairment 5,048 308 1,226 30,387 — 36,969 Ending balance: collectively evaluated for impairment 1,731,688 452,681 1,742,794 2,184,924 800,660 6,912,747 For the Three Months Ended September 30, 2021 Beginning balance Charge-offs Recoveries Provision (credit) a Ending balance (dollars in thousands) Commercial, financial, agricultural and other $ 21,466 $ (2,066) $ 106 $ (1,644) $ 17,862 Time and demand 21,098 (2,059) 104 (1,561) 17,582 Commercial credit cards 368 (7) 2 (83) 280 Real estate construction 4,285 — — 48 4,333 Residential real estate 12,933 (11) 98 (215) 12,805 Residential first lien 7,394 — 24 39 7,457 Residential junior lien/home equity 5,539 (11) 74 (254) 5,348 Commercial real estate 35,795 (102) 90 (1,143) 34,640 Multifamily 4,379 — — (548) 3,831 Nonowner occupied 26,911 — 80 (893) 26,098 Owner occupied 4,505 (102) 10 298 4,711 Loans to individuals 22,559 (727) 335 2,378 24,545 Automobile 19,298 (331) 251 1,984 21,202 Consumer credit cards 528 (125) 9 84 496 Consumer other 2,733 (271) 75 310 2,847 Total loans $ 97,038 $ (2,906) $ 629 $ (576) $ 94,185 a) The provision expense(credit) shown here excludes the provision for off-balance sheet credit exposure included in the income statement. For the Three Months Ended September 30, 2020 Commercial, Real estate Residential Commercial Loans to Total (dollars in thousands) Allowance for credit losses: Originated loans: Beginning balance $ 24,812 $ 3,067 $ 9,239 $ 33,130 $ 9,334 $ 79,582 Charge-offs (3,395) — (161) — (1,149) (4,705) Recoveries 44 — 153 110 226 533 Provision (credit) 3,691 441 (979) 7,362 404 10,919 Ending balance 25,152 3,508 8,252 40,602 8,815 86,329 Acquired loans: Beginning balance 332 171 — 1,356 — 1,859 Charge-offs — — (122) — (80) (202) Recoveries 13 — 13 — 2 28 Provision (credit) (9) (171) 109 286 78 293 Ending balance 336 — — 1,642 — 1,978 Total ending balance $ 25,488 $ 3,508 $ 8,252 $ 42,244 $ 8,815 $ 88,307	[1]
[1]	a) The provision expense(credit) shown here excludes the provision for off-balance sheet credit exposure included in the income statement.

Leases Lease Liability Maturity

Leases Lease Liability Maturity (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Lessee, Operating Leases [Text Block]	The following table represents the unaudited Consolidated Statements of Condition classification of the Company’s right of use ("ROU") assets and lease liabilities, lease costs and other lease information. September 30, 2021 December 31, 2020 Balance sheet: Operating lease asset classified as premises and equipment $ 40,245 $ 42,617 Operating lease liability classified as other liabilities 44,473 46,819 For the Three Months Ended For the Nine Months Ended September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 Income statement: Operating lease cost classified as occupancy and equipment expense $ 1,202 $ 1,545 $ 3,603 $ 4,281 Weighted average lease term, in years 14.36 15.10 Weighted average discount rate 3.34 % 3.42 % Operating cash flows $ 1,190 $ 2,007
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Future minimum payments for operating leases with initial or remaining terms of one year or more as of September 30, 2021 were as follows (dollars in thousands): For the twelve months ended: September 30, 2022 $ 4,623 September 30, 2023 4,591 September 30, 2024 4,428 September 30, 2025 4,306 September 30, 2026 3,849 Thereafter 35,364 Total future minimum lease payments 57,161 Less remaining imputed interest 12,688 Operating lease liability $ 44,473

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Inputs, Assets, Quantitative Information	In accordance with ASU No. 2011-4, the following table provides information related to quantitative inputs and assumptions used in Level 3 fair value measurements. Fair Value (dollars Valuation Unobservable Inputs Range / September 30, 2021 Other Investments $ 1,670 Carrying Value N/A N/A Nonperforming Loans 657 (a) Gas Reserve Study Discount rate 10.00% Gas per MMBTU $2.00 - $2.00 (b) Oil per BBL/d $50.00 - $50.00 (b) Limited Partnership Investments 14,613 Par Value N/A N/A December 31, 2020 Other Investments $ 1,670 Carrying Value N/A N/A Nonperforming Loans 798 (a) Gas Reserve Study Discount rate 10.00% Gas per MMBTU $1.46 - $1.48 (b) Oil per BBL/d $36 - $36 (b) Limited Partnership Investments 6,619 Par Value N/A N/A (a) The remainder of nonperforming loans valued using Level 3 inputs are not included in this disclosure as the values of those loans are based on bankruptcy agreement documentation. (b) Unobservable inputs are defined as follows: MMBTU - one million British thermal units; BBL/d - barrels per day.
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The tables below present the balances of assets and liabilities measured at fair value on a recurring basis: September 30, 2021 Level 1 Level 2 Level 3 Total (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities - Residential $ — $ 5,982 $ — $ 5,982 Mortgage-Backed Securities - Commercial — 393,707 — 393,707 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities - Residential — 685,426 — 685,426 Other Government-Sponsored Enterprises — 991 — 991 Obligations of States and Political Subdivisions — 9,610 — 9,610 Corporate Securities — 29,240 — 29,240 Total Securities Available for Sale — 1,124,956 — 1,124,956 Other Investments — 11,049 1,670 12,719 Loans Held for Sale — 19,925 — 19,925 Other Assets (a) — 34,631 14,613 49,244 Total Assets $ — $ 1,190,561 $ 16,283 $ 1,206,844 Other Liabilities (a) $ — $ 38,743 $ — $ 38,743 Total Liabilities $ — $ 38,743 $ — $ 38,743 (a) Hedging and non-hedging interest rate derivatives and limited partnership investments December 31, 2020 Level 1 Level 2 Level 3 Total (dollars in thousands) Obligations of U.S. Government Agencies: Mortgage-Backed Securities - Residential $ — $ 7,230 $ — $ 7,230 Mortgage-Backed Securities - Commercial — 191,180 — 191,180 Obligations of U.S. Government-Sponsored Enterprises: Mortgage-Backed Securities - Residential — 496,033 — 496,033 Other Government-Sponsored Enterprises — 100,998 — 100,998 Obligations of States and Political Subdivisions — 11,397 — 11,397 Corporate Securities — 24,385 — 24,385 Total Securities Available for Sale — 831,223 — 831,223 Other Investments — 10,557 1,670 12,227 Loans Held for Sale — 33,436 — 33,436 Premises and Equipment, net — 442 — 442 Other Assets (a) — 54,362 6,619 60,981 Total Assets $ — $ 930,020 $ 8,289 $ 938,309 Other Liabilities (a) $ — $ 61,308 $ — $ 61,308 Total Liabilities $ — $ 61,308 $ — $ 61,308
Schedule of Assets Measured on Non-Recurring Basis	The tables below present the balances of assets measured at fair value on a nonrecurring basis at: September 30, 2021 Level 1 Level 2 Level 3 Total (dollars in thousands) Nonperforming loans $ — $ 24,512 $ 12,594 $ 37,106 Other real estate owned — 631 — 631 Total Assets $ — $ 25,143 $ 12,594 $ 37,737 December 31, 2020 Level 1 Level 2 Level 3 Total (dollars in thousands) Nonperforming loans $ — $ 35,543 $ 13,604 $ 49,147 Other real estate owned — 1,319 — 1,319 Total Assets $ — $ 36,862 $ 13,604 $ 50,466
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques	For the nine months ended September 30, changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2021 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 6,620 $ 8,290 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 8,113 8,113 Issuances — — — Sales — — — Settlements — (120) (120) Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 14,613 $ 16,283 2020 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 5,795 $ 7,465 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 751 751 Issuances — — — Sales — — — Settlements — — — Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 6,546 $ 8,216 For the three months ended September 30, changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2021 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 7,448 $ 9,118 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 7,194 7,194 Issuances — — — Sales — — — Settlements — (29) (29) Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 14,613 $ 16,283 2020 Other Investments Other Total (dollars in thousands) Balance, beginning of period $ 1,670 $ 6,406 $ 8,076 Total gains or losses Included in earnings — — — Included in other comprehensive income — — — Purchases, issuances, sales and settlements Purchases — 140 140 Issuances — — — Sales — — — Settlements — — — Transfers from Level 3 — — — Transfers into Level 3 — — — Balance, end of period $ 1,670 $ 6,546 $ 8,216
Losses Realized on Assets Measured on Non-Recurring Basis	The following losses were realized on the assets measured on a nonrecurring basis: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (dollars in thousands) Nonperforming loans $ (745) $ (3,695) $ (2,537) $ (9,940) Other real estate owned — (4) — (4) Total losses $ (745) $ (3,699) $ (2,537) $ (9,944)
Carrying Amounts and Fair Values of Financial Instruments	The following table presents carrying amounts and fair values of First Commonwealth’s financial instruments: September 30, 2021 Fair Value Measurements Using: Carrying Total Level 1 Level 2 Level 3 (dollars in thousands) Financial assets Cash and due from banks $ 94,579 $ 94,579 $ 94,579 $ — $ — Interest-bearing deposits 240,095 240,095 240,095 — — Securities available for sale 1,124,956 1,124,956 — 1,124,956 — Securities held to maturity 548,057 547,343 — 547,343 — Other investments 12,719 12,719 — 11,049 1,670 Loans held for sale 19,925 19,925 — 19,925 — Loans 6,732,580 7,118,886 — 24,512 7,094,374 Financial liabilities Deposits 7,936,485 7,936,033 — 7,936,033 — Short-term borrowings 117,754 117,602 — 117,602 — Subordinated debt 170,734 175,178 — — 175,178 Long-term debt 5,746 6,385 — 6,385 — Capital lease obligation 6,039 6,039 — 6,039 — December 31, 2020 Fair Value Measurements Using: Carrying Total Level 1 Level 2 Level 3 (dollars in thousands) Financial assets Cash and due from banks $ 100,009 $ 100,009 $ 100,009 $ — $ — Interest-bearing deposits 256,572 256,572 256,572 — — Securities available for sale 831,223 831,223 — 831,223 — Securities held to maturity 361,844 369,851 — 369,851 — Other investments 12,227 12,227 — 10,557 1,670 Loans held for sale 33,436 33,436 — 33,436 — Loans 6,761,183 7,202,763 — 35,543 7,167,220 Financial liabilities Deposits 7,438,666 7,440,906 — 7,440,906 — Short-term borrowings 117,373 117,037 — 117,037 — Subordinated debt 170,612 165,665 — — 165,665 Long-term debt 56,258 57,881 — 57,881 — Capital lease obligation 6,385 6,385 — 6,385 —

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Credit Value Adjustment Recorded Related to Notional Amount Of Derivatives Outstanding	The following table depicts the credit value and fair value adjustments recorded related to the notional amount of derivatives outstanding as well as the notional amount of risk participation agreements participated to other banks: September 30, 2021 December 31, 2020 (dollars in thousands) Derivatives not Designated as Hedging Instruments Credit value adjustment $ (1,422) $ (2,792) Notional amount: Interest rate derivatives 704,383 631,446 Interest rate caps 66,137 66,527 Interest rate collars 35,354 35,354 Risk participation agreements 214,736 220,280 Sold credit protection on risk participation agreements (90,539) (78,522) Interest rate options 38,509 47,874 Derivatives Designated as Hedging Instruments Interest rate swaps: Fair value adjustment (2,890) (3,665) Notional amount 420,000 70,000 Interest rate forwards: Fair value adjustment 182 (483) Notional amount 36,000 65,000 Foreign exchange forwards: Fair value adjustment 17 (5) Notional amount 2,589 2,119
Schedule of Changes in Fair Value of Derivative Assets and Liabilities	The table below presents the change in the fair value of derivative assets and derivative liabilities attributable to credit risk or fair value changes included in "Other income," 'Other expense," "Interest on subordinated debentures" or "Interest and fees on loans" in the unaudited Consolidated Statements of Income: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (dollars in thousands) Non-hedging interest rate derivatives (Decrease) increase in other income $ (202) $ 142 $ 106 $ (611) Hedging interest rate derivatives Decrease in interest and fees on loans (520) — (825) — Increase in interest from subordinated debentures 248 208 710 219 Hedging interest rate forwards (Decrease) increase in other income (265) (102) (666) 132 Hedging foreign exchange forwards Increase in other expense 2 3 7 15

Subordinated Debentures Subor_2

Subordinated Debentures Subordinated Debentures Outstanding (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract]
Schedule of Subordinated Borrowing [Table Text Block]	Subordinated debentures outstanding are as follows: September 30, 2021 December 31, 2020 Due Amount Rate Amount Rate (dollars in thousands) Owed to: First Commonwealth Bank 2028 $ 49,383 4.875% until June 1, 2023, then LIBOR + 1.845% $ 49,314 4.875% until June 1, 2023, then LIBOR + 1.845% First Commonwealth Bank 2033 49,184 5.50% until June 1, 2028, then LIBOR + 2.37% 49,131 5.50% until June 1, 2028, then LIBOR + 2.37% First Commonwealth Capital Trust II 2034 30,929 LIBOR + 2.85% 30,929 LIBOR + 2.85% First Commonwealth Capital Trust III 2034 41,238 LIBOR + 2.85% 41,238 LIBOR + 2.85% Total $ 170,734 $ 170,612

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recogntion (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue Recognition [Abstract]
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]	The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (dollars in thousands) Noninterest Income In-scope of Topic 606: Trust income $ 3,118 $ 2,554 $ 8,340 $ 6,774 Service charges on deposit accounts 4,770 4,035 13,127 12,066 Insurance and retail brokerage commissions 2,218 2,156 6,368 5,982 Card-related interchange income 7,052 6,441 20,885 17,589 Gain on sale of other loans and assets 125 520 630 853 Other income 1,064 945 3,146 2,713 Noninterest Income (in-scope of Topic 606) 18,347 16,651 52,496 45,977 Noninterest Income (out-of-scope of Topic 606) 8,898 10,118 28,190 21,877 Total Noninterest Income $ 27,245 $ 26,769 $ 80,686 $ 67,854

Reclassification of Accumulated

Reclassification of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ (4,025)	$ (3,256)	$ (18,122)	$ 22,069
Reclassification adjustment for gains on securities included in net income	0	(20)	(16)	(47)
Total unrealized gains on securities	(4,025)	(3,276)	(18,138)	22,022
Unrealized holding (losses) gains on derivatives arising during the period	(529)	225	776	(4,892)
Unrealized holding gains on securities arising during the period	844	684	3,805	(4,635)
Reclassification adjustment for gains on derivatives included in net income, before Tax	0	0	0	0
Total unrealized gain on derivatives	(529)	225	776	(4,892)
Reclassification adjustment for gains on securities included in net income	0	4	3	10
Total other comprehensive (loss) income	(4,554)	(3,051)	(17,362)	17,130
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	844	688	3,808	(4,625)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Tax	955	640	3,645	(3,598)
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Total unrealized (losses) gains on securities	(3,181)	(2,588)	(14,330)	17,397
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(418)	177	613	(3,865)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	(418)	177	613	(3,865)
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Reclassification adjustment for gains on securities included in net income	0	16	13	37
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,516		3,516		$ 17,233
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(418)	177	613	(3,865)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(529)	225	776	(4,892)
Other comprehensive income (loss)	(3,599)	(2,411)	(13,717)	13,532
Unrealized holding (losses) gains on securities arising during the period	(4,025)	(3,256)	(18,122)	22,069
Unrealized holding gains on securities arising during the period	844	684	3,805	(4,635)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	20	16	47
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	(4)	(3)	(10)
Reclassification adjustment for gains on securities included in net income	0	16	13	37
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	(4,025)	(3,276)	(18,138)	22,022
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	844	688	3,808	(4,625)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(3,181)	(2,588)	(14,330)	17,397
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(529)	225	776	(4,892)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(418)	177	613	(3,865)
Other Comprehensive Income (Loss), before Tax	(4,554)	(3,051)	(17,362)	17,130
Other Comprehensive Income (Loss), Tax	955	640	3,645	(3,598)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Total other comprehensive (loss) income	(3,181)	(2,588)	(14,330)	17,397
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	5,980	21,977	5,980	21,977	20,310	$ 4,580
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Amounts reclassified from accumulated other comprehensive income (loss)	0	(16)	(13)	(37)
Other comprehensive income (loss)	(3,181)	(2,588)	(14,330)	17,397
Accumulated Defined Benefit Plans Adjustment [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Other comprehensive income (loss) before reclassification adjustment	0	0	0	0
Total other comprehensive (loss) income	0	0	0	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(182)	365	(182)	365	(182)	365
Other comprehensive income (loss) before reclassification adjustment	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Derivative [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Total other comprehensive (loss) income	(418)	177	613	(3,865)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,282)	(3,231)	(2,282)	(3,231)	(2,895)	634
Other comprehensive income (loss)	(418)	177	613	(3,865)
Accumulated Other Comprehensive Income (Loss), net [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,516	19,111	3,516	19,111	$ 17,233	$ 5,579
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,599)	(2,395)	(13,704)	13,569
Amounts reclassified from accumulated other comprehensive income (loss)	0	(16)	(13)	(37)
Other comprehensive income (loss)	$ (3,599)	$ (2,411)	$ (13,717)	$ 13,532

Schedule of Accumulated Other C

Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			$ 17,233
Other comprehensive income (loss) before reclassification adjustment	$ (3,181)	$ (2,572)	(14,317)	$ 17,434
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(418)	177	613	(3,865)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0	0	0
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Accumulated Other Comprehensive Income (Loss), Ending Balance	3,516		3,516
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			20,310	4,580
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Amounts reclassified from accumulated other comprehensive income (loss)	0	(16)	(13)	(37)
Total other comprehensive (loss) income	(3,181)	(2,588)	(14,330)	17,397
Accumulated Other Comprehensive Income (Loss), Ending Balance	5,980	21,977	5,980	21,977
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	9,161	24,565
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			(182)	365
Other comprehensive income (loss) before reclassification adjustment	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Total other comprehensive (loss) income	0	0	0	0
Accumulated Other Comprehensive Income (Loss), Ending Balance	(182)	365	(182)	365
Accumulated Defined Benefit Plans Adjustment [Member] | Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(182)	365
Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			(2,895)	634
Total other comprehensive (loss) income	(418)	177	613	(3,865)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(2,282)	(3,231)	(2,282)	(3,231)
Derivative [Member] | Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(1,864)	(3,408)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			17,233	5,579
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,599)	(2,395)	(13,704)	13,569
Amounts reclassified from accumulated other comprehensive income (loss)	0	(16)	(13)	(37)
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Accumulated Other Comprehensive Income (Loss), Ending Balance	3,516	19,111	$ 3,516	$ 19,111
Accumulated Other Comprehensive Income (Loss) [Member] | Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ 7,115	$ 21,522

Supplemental Cash Flow Disclosu

Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid during the period for:
Interest	$ 11,039	$ 26,687
Income Taxes Paid, Net	22,374	16,207
Non-cash investing and financing activities:
Loans Transferred to Other Real Estate Owned and Repossessions	2,533	3,206
Fair value of loans transferred from held to maturity to held for sale	55,700	27,391
Transfer of Loans Held-for-sale to Portfolio Loans	0	1,908
Gross (decrease) increase in market value adjustment to securities available for sale	(18,138)	22,022
Gross increase (decrease) in market value adjustment to derivatives	(776)	(4,892)
Stock Issued During Period, Value, Treasury Stock Reissued	2,042	1,594
Unsettled Bank Owned Life Insurance Proceeds	(384)	(384)
Transfer to Investments	0	22,644
Other Significant Noncash Transaction, Value of Consideration Given	6,929	0
Proceeds from reissuance of treasury stock	$ 680	$ 0

Earnings per Share - Compositio

Earnings per Share - Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Weighted Average Number of Shares Issued, Basic	113,914,902	113,914,902	113,914,902	113,914,902
Average treasury shares (in shares)	(18,103,611)	(15,821,469)	(17,840,694)	(15,761,114)
Weighted Average Number of Shares, Deferred Compensation Plans	(55,615)	(45,454)	(55,581)	(41,790)
Average unearned nonvested shares	(139,255)	(130,883)	(134,759)	(121,249)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	95,616,421	97,917,096	95,883,868	97,990,749
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	220,268	197,545	191,119	188,255
Weighted Average Number Of Additional Shares Deferred Compensation Plan	55,615	45,502	55,615	45,502
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	95,892,304	98,160,143	96,130,602	98,224,506
Basic Earnings per Share (in dollars per share)	$ 0.36	$ 0.20	$ 1.08	$ 0.49
Diluted Earnings per Share (in dollars per share)	$ 0.36	$ 0.20	$ 1.08	$ 0.49

Earnings per Share - Common Sto

Earnings per Share - Common Stock Equivalents Not Included in Computation of Diluted Earnings Per Share (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	111,589	110,068
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	29,547	102,844
Minimum [Member] | Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 12.77	$ 13.72
Minimum [Member] | Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	16.41	12.43
Maximum [Member] | Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	14.58	15.44
Maximum [Member] | Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 16.41	$ 15.37

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Notional Amount of Outstanding Commitments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Financial instrument of credit risk	$ 2,270,058	$ 2,097,628
Financial standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument of credit risk	15,914	15,988
Performance standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument of credit risk	11,233	16,864
Commercial letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument of credit risk	$ 975	$ 783

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Notional Amount Of Performance Standby Letters Of Credit	$ 2,500,000
Notional Amount Of Commercial Letters Of Credit	0
Notional Amount Of Financial Standby Letters Of Credit	100,000
Financial instrument of credit risk	100,000	$ 100,000
Financial instrument of credit risk	100,000	100,000
Unfunded commitment liability	6,400,000	$ 7,400,000
Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1,000,000

Investment Securities - Analysi

Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment Securities [Line Items]
Amortized Cost	$ 1,117,384	$ 805,515
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	15,696	25,708
Gross Unrealized Losses	(8,124)	0
Securities available for sale, at fair value	1,124,956	831,223
US Government Agencies Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Amortized Cost	5,448	6,492
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	534	738
Gross Unrealized Losses	0	0
Securities available for sale, at fair value	5,982	7,230
US Government Agency Debt Securities Commercial [Member]
Investment Securities [Line Items]
Amortized Cost	390,566	182,823
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,588	8,357
Gross Unrealized Losses	(1,447)	0
Securities available for sale, at fair value	393,707	191,180
Residential Mortgage Backed Securities [Member]
Investment Securities [Line Items]
Amortized Cost	682,677	481,109
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9,296	14,924
Gross Unrealized Losses	(6,547)	0
Securities available for sale, at fair value	685,426	496,033
US Government-sponsored Enterprises Debt Securities [Member]
Investment Securities [Line Items]
Amortized Cost	1,000	100,996
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	2
Gross Unrealized Losses	(9)	0
Securities available for sale, at fair value	991	100,998
Obligations of States and Political Subdivisions [Member]
Investment Securities [Line Items]
Amortized Cost	9,586	11,154
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	105	243
Gross Unrealized Losses	(81)	0
Securities available for sale, at fair value	9,610	11,397
Corporate Debt Securities [Member]
Investment Securities [Line Items]
Amortized Cost	28,107	22,941
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,173	1,444
Gross Unrealized Losses	(40)	0
Securities available for sale, at fair value	$ 29,240	$ 24,385

Investment Securities - Maturit

Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Due within one year, Amortized Cost	$ 5,000
Due within one year, Estimated Fair Value	5,027
Due after one but within five years, Amortized Cost	13,872
Due after one but within five years, Estimated Fair Value	14,498
Due after five but within ten years, Amortized Cost	19,821
Due after five but within ten years, Estimated Fair Value	20,316
Due after ten years, Amortized Cost	0
Due after ten years, Estimated Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	38,693
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	39,841
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,078,691
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,085,115
Amortized Cost	1,117,384	$ 805,515
Securities available for sale, at fair value	1,124,956	$ 831,223
Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	1,117,384
Securities available for sale, at fair value	1,124,956
US Government Agencies Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	396,000
Securities available for sale, at fair value	399,700
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Net Investment Income [Line Items]
Amortized Cost	682,700
Securities available for sale, at fair value	$ 685,400

Investment Securities - Proceed

Investment Securities - Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from Sale of Available-for-sale Securities	$ 0	$ 0
Sales Transactions:
Available-for-sale Securities, Gross Realized Gains	0	0
Gross losses	0	0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	0
Maturities and impairment
Gross Gains	16	47
Gross Losses	0	0
Gain Losses Maturities And Impairment	16	47
Net gains and impairment	$ 16	$ 47

Investment Securities Held to M

Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 548,057	$ 361,844
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	5,243	8,017
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,957)	(10)
Securities held to maturity, fair value	547,343	369,851
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	2,432	2,766
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	125	138
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	2,557	2,904
US Government Agency Debt Securities Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	96,228	36,799
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	590	1,441
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(834)	0
Securities held to maturity, fair value	95,984	38,240
Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	387,399	277,351
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	3,832	5,389
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4,303)	(10)
Securities held to maturity, fair value	386,928	282,730
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	7,927	9,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	235	344
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	8,162	10,081
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	31,246	34,391
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	461	705
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(94)	0
Securities held to maturity, fair value	31,613	35,096
Debt Security, Government, Non-US [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,000	800
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	$ 1,000	$ 800

Investment Securities Schedule

Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 1,800
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	1,807
Due after 1 but within 5 years	5,568
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	5,616
Due after 5 but within 10 years	43,207
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	42,769
Due after 10 years	3,496
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	3,520
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	54,071
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	53,712
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	493,986
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	493,631
Debt Securities, Held-to-maturity	548,057	$ 361,844
Securities held to maturity, fair value	547,343	$ 369,851
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	98,700
Securities held to maturity, fair value	98,500
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	395,300
Securities held to maturity, fair value	$ 395,100

Schedule of Temporary Impairmen

Schedule of Temporary Impairment Losses, Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 894,437	$ 3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(14,081)	(10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	894,437	3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(14,081)	(10)
Debt Securities, Held-to-maturity	548,057	361,844
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	5,243	8,017
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,957)	(10)
Securities held to maturity, fair value	547,343	369,851
US Government Agencies Debt Securities Commercial
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	213,203
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,281)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	213,203
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,281)
Residential Mortgage Backed Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	640,235	3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(10,850)	(10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	640,235	3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(10,850)	(10)
Debt Securities, Held-to-maturity	387,399	277,351
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	3,832	5,389
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4,303)	(10)
Securities held to maturity, fair value	386,928	282,730
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	22,090
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(735)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	22,090
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(735)
Debt Securities, Held-to-maturity	21,825	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(726)	0
Securities held to maturity, fair value	21,099	0
Obligations of States and Political Subdivisions [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	13,798
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(175)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	13,798
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(175)
Debt Securities, Held-to-maturity	31,246	34,391
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	461	705
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(94)	0
Securities held to maturity, fair value	31,613	35,096
Corporate Debt Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,111
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(40)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	5,111
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(40)
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Debt Securities, Held-to-maturity	7,927	9,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	235	344
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	$ 8,162	$ 10,081

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	$ 0	$ 0
Gain Losses Maturities And Impairment	16,000	47,000
Available-for-sale Securities, Gross Realized Gains	0	0
Gross Losses	0	0
Gross Gains	16,000	47,000
Debt Securities, Held-to-maturity, Restricted	334,500,000		$ 228,100,000
Proceeds from Sale of Available-for-sale Securities	0	0
Debt Securities, Available-for-sale, Restricted	$ 802,200,000		792,100,000
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total	52
Amortized Cost	$ 1,117,384,000		805,515,000
Available-for-sale Securities	1,124,956,000		831,223,000
Other than temporary impairment charges recognized	0	0
Other Investments and Securities, at Cost	1,700,000		1,700,000
Federal Home Loan Bank Stock	$ 11,000,000		10,600,000
US Government-sponsored Enterprises Debt Securities [Member]
Percent of Unrealized Losses	98.00%
Available-for-sale Securities	$ 991,000		$ 100,998,000
Corporate Debt Securities [Member]
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total	1		0
Amortized Cost	$ 28,100,000		$ 22,900,000
Available-for-sale Securities	29,240,000		$ 24,385,000
Equity Securities [Member]
Other than temporary impairment charges recognized	$ 0	$ 0

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ (6,732,580)	$ (6,761,183)	$ (6,949,716)
Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(1,224,591)	(1,555,986)	(1,736,736)
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(1,210,694)	(1,541,382)
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(13,897)	(14,604)
Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(424,016)	(427,221)	(452,989)
Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(1,875,375)	(1,750,592)	(1,744,020)
Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(1,254,142)	(1,144,323)
Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(621,233)	(606,269)
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(2,231,890)	(2,211,569)	(2,215,311)
Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(405,720)	(371,239)
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(1,442,845)	(1,421,151)
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(383,325)	(419,179)
Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(976,708)	(815,815)	$ (800,660)
Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(886,367)	(712,800)
Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	(10,617)	(12,360)
Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ (79,724)	$ (90,655)

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 6,732,580	$ 6,761,183
Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,210,694	1,541,382
Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,254,142	1,144,323
Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	621,233	606,269
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	405,720	371,239
Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,442,845	1,421,151
Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	383,325	419,179
Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	886,367	712,800
Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	79,724	90,655
Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,224,591	1,555,986
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,210,694	1,541,382
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	424,016	427,221
Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,875,375	1,750,592
Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,254,142	1,144,323
Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	621,233	606,269
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,231,890	2,211,569
Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	405,720	371,239
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,442,845	1,421,151
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	383,325	419,179
Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	976,708	815,815
Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	886,367	712,800
Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	79,724	90,655
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,536,789	6,458,370
Pass [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,172,090	1,477,312
Pass [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Pass [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,249,248	1,138,409
Pass [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	617,942	602,583
Pass [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	390,579	369,883
Pass [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,323,095	1,216,252
Pass [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	370,802	397,123
Pass [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	886,183	712,539
Pass [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Pass [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	79,668	90,642
Pass [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,185,987	1,491,916
Pass [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,172,090	1,477,312
Pass [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Pass [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	422,668	426,663
Pass [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,867,190	1,740,992
Pass [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,249,248	1,138,409
Pass [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	617,942	602,583
Pass [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,084,476	1,983,258
Pass [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	390,579	369,883
Pass [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,323,095	1,216,252
Pass [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	370,802	397,123
Pass [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	976,468	815,541
Pass [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	886,183	712,539
Pass [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Pass [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	79,668	90,642
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	137,011	226,634
Special Mention [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,318	48,233
Special Mention [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,444	1,780
Special Mention [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	72	122
Special Mention [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	14,635	131
Special Mention [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	99,917	161,336
Special Mention [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	7,331	14,528
Special Mention [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,318	48,233
Special Mention [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,318	48,233
Special Mention [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Special Mention [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,294	504
Special Mention [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,516	1,902
Special Mention [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,444	1,780
Special Mention [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	72	122
Special Mention [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	121,883	175,995
Special Mention [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	14,635	131
Special Mention [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	99,917	161,336
Special Mention [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	7,331	14,528
Special Mention [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Special Mention [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Special Mention [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Special Mention [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	58,780	76,179
Substandard [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	26,286	15,837
Substandard [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,450	4,134
Substandard [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,219	3,564
Substandard [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	506	1,225
Substandard [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	19,833	43,563
Substandard [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,192	7,528
Substandard [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	184	261
Substandard [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	56	13
Substandard [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	26,286	15,837
Substandard [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	26,286	15,837
Substandard [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Substandard [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54	54
Substandard [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,669	7,698
Substandard [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,450	4,134
Substandard [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,219	3,564
Substandard [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	25,531	52,316
Substandard [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	506	1,225
Substandard [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	19,833	43,563
Substandard [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,192	7,528
Substandard [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	240	274
Substandard [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	184	261
Substandard [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Substandard [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	56	13
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Unlikely to be Collected Financing Receivable | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Criticized [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	195,791	302,813
Criticized [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	38,604	64,070
Criticized [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	38,604	64,070
Criticized [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Criticized [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,348	558
Criticized [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	8,185	9,600
Criticized [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	4,894	5,914
Criticized [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,291	3,686
Criticized [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	147,414	228,311
Criticized [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	15,141	1,356
Criticized [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	119,750	204,899
Criticized [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,523	22,056
Criticized [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	240	274
Criticized [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	184	261
Criticized [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Criticized [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 56	$ 13

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Credit Risk Profile Vintage by Creditworthiness (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 6,732,580	$ 6,761,183
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,536,789	6,458,370
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	137,011	226,634
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	58,780	76,179
Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,210,694	1,541,382
Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,172,090	1,477,312
Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,318	48,233
Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	26,286	15,837
Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	424,016	427,221
Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	422,668	426,663
Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,294	504
Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54	54
Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,254,142	1,144,323
Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,249,248	1,138,409
Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,444	1,780
Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,450	4,134
Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	621,233	606,269
Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	617,942	602,583
Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	72	122
Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,219	3,564
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	405,720	371,239
Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	390,579	369,883
Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	14,635	131
Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	506	1,225
Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,442,845	1,421,151
Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,323,095	1,216,252
Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	99,917	161,336
Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	19,833	43,563
Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	383,325	419,179
Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	370,802	397,123
Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	7,331	14,528
Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,192	7,528
Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	886,367	712,800
Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	886,183	712,539
Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	184	261
Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	79,724	90,655
Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	79,668	90,642
Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	56	13
Term Loan Receivable, Originated in Current Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,376,833	1,667,389
Term Loan Receivable, Originated in Current Year | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	305,101	598,053
Term Loan Receivable, Originated in Current Year | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	305,081	597,405
Term Loan Receivable, Originated in Current Year | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	93
Term Loan Receivable, Originated in Current Year | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	20	555
Term Loan Receivable, Originated in Current Year | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	109,671	150,493
Term Loan Receivable, Originated in Current Year | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	109,647	150,493
Term Loan Receivable, Originated in Current Year | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	24	0
Term Loan Receivable, Originated in Current Year | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	280,135	316,052
Term Loan Receivable, Originated in Current Year | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	280,124	316,028
Term Loan Receivable, Originated in Current Year | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	11	24
Term Loan Receivable, Originated in Current Year | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	42,602	3,055
Term Loan Receivable, Originated in Current Year | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	42,602	3,055
Term Loan Receivable, Originated in Current Year | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	81,608	76,249
Term Loan Receivable, Originated in Current Year | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	81,608	76,249
Term Loan Receivable, Originated in Current Year | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	113,742	105,861
Term Loan Receivable, Originated in Current Year | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	113,742	105,861
Term Loan Receivable, Originated in Current Year | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	49,257	59,519
Term Loan Receivable, Originated in Current Year | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	49,257	58,551
Term Loan Receivable, Originated in Current Year | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	968
Term Loan Receivable, Originated in Current Year | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	384,494	350,293
Term Loan Receivable, Originated in Current Year | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	384,494	350,293
Term Loan Receivable, Originated in Current Year | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in Current Year | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,223	7,814
Term Loan Receivable, Originated in Current Year | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,223	7,814
Term Loan Receivable, Originated in Current Year | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,180,456	1,022,396
Term Loan Receivable, Originated in One Year Prior | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	127,699	193,601
Term Loan Receivable, Originated in One Year Prior | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	127,623	189,834
Term Loan Receivable, Originated in One Year Prior | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	75	3,373
Term Loan Receivable, Originated in One Year Prior | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1	394
Term Loan Receivable, Originated in One Year Prior | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	145,193	133,195
Term Loan Receivable, Originated in One Year Prior | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	143,923	133,195
Term Loan Receivable, Originated in One Year Prior | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,270	0
Term Loan Receivable, Originated in One Year Prior | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	372,184	184,550
Term Loan Receivable, Originated in One Year Prior | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	372,164	184,533
Term Loan Receivable, Originated in One Year Prior | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	20	17
Term Loan Receivable, Originated in One Year Prior | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,207	5,783
Term Loan Receivable, Originated in One Year Prior | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,207	5,698
Term Loan Receivable, Originated in One Year Prior | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	85
Term Loan Receivable, Originated in One Year Prior | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	80,628	16,287
Term Loan Receivable, Originated in One Year Prior | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	80,628	16,287
Term Loan Receivable, Originated in One Year Prior | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	111,404	199,280
Term Loan Receivable, Originated in One Year Prior | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	111,404	190,301
Term Loan Receivable, Originated in One Year Prior | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	8,979
Term Loan Receivable, Originated in One Year Prior | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	59,485	72,313
Term Loan Receivable, Originated in One Year Prior | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	57,858	70,726
Term Loan Receivable, Originated in One Year Prior | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,414	684
Term Loan Receivable, Originated in One Year Prior | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	213	903
Term Loan Receivable, Originated in One Year Prior | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	276,368	202,923
Term Loan Receivable, Originated in One Year Prior | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	276,368	202,827
Term Loan Receivable, Originated in One Year Prior | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	96
Term Loan Receivable, Originated in One Year Prior | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated in One Year Prior | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,288	14,464
Term Loan Receivable, Originated in One Year Prior | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,288	14,464
Term Loan Receivable, Originated in One Year Prior | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	826,107	792,402
Term Loan Receivable, Originated Two Years Prior | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	145,265	142,224
Term Loan Receivable, Originated Two Years Prior | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	126,211	140,473
Term Loan Receivable, Originated Two Years Prior | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,173	972
Term Loan Receivable, Originated Two Years Prior | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	17,881	779
Term Loan Receivable, Originated Two Years Prior | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	118,290	104,167
Term Loan Receivable, Originated Two Years Prior | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	118,290	104,167
Term Loan Receivable, Originated Two Years Prior | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	138,407	142,823
Term Loan Receivable, Originated Two Years Prior | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	138,236	142,467
Term Loan Receivable, Originated Two Years Prior | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	83
Term Loan Receivable, Originated Two Years Prior | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	171	273
Term Loan Receivable, Originated Two Years Prior | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,682	4,545
Term Loan Receivable, Originated Two Years Prior | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,604	4,545
Term Loan Receivable, Originated Two Years Prior | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	78	0
Term Loan Receivable, Originated Two Years Prior | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	16,466	69,439
Term Loan Receivable, Originated Two Years Prior | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	16,466	69,439
Term Loan Receivable, Originated Two Years Prior | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	198,003	161,018
Term Loan Receivable, Originated Two Years Prior | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	198,003	139,643
Term Loan Receivable, Originated Two Years Prior | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	21,375
Term Loan Receivable, Originated Two Years Prior | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	56,875	61,079
Term Loan Receivable, Originated Two Years Prior | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54,392	55,478
Term Loan Receivable, Originated Two Years Prior | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,239	4,736
Term Loan Receivable, Originated Two Years Prior | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,244	865
Term Loan Receivable, Originated Two Years Prior | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	139,680	96,355
Term Loan Receivable, Originated Two Years Prior | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	139,599	96,336
Term Loan Receivable, Originated Two Years Prior | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	81	19
Term Loan Receivable, Originated Two Years Prior | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Two Years Prior | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	9,439	10,752
Term Loan Receivable, Originated Two Years Prior | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	9,439	10,752
Term Loan Receivable, Originated Two Years Prior | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	564,204	589,307
Term Loan Receivable, Originated Three Years Prior | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	100,018	72,277
Term Loan Receivable, Originated Three Years Prior | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	99,050	63,137
Term Loan Receivable, Originated Three Years Prior | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	816	8,820
Term Loan Receivable, Originated Three Years Prior | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	152	320
Term Loan Receivable, Originated Three Years Prior | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	48,963	34,803
Term Loan Receivable, Originated Three Years Prior | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	48,963	34,803
Term Loan Receivable, Originated Three Years Prior | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	95,498	110,365
Term Loan Receivable, Originated Three Years Prior | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	95,081	110,260
Term Loan Receivable, Originated Three Years Prior | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	71	0
Term Loan Receivable, Originated Three Years Prior | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	346	105
Term Loan Receivable, Originated Three Years Prior | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,038	2,005
Term Loan Receivable, Originated Three Years Prior | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,038	2,005
Term Loan Receivable, Originated Three Years Prior | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54,180	66,963
Term Loan Receivable, Originated Three Years Prior | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54,180	66,963
Term Loan Receivable, Originated Three Years Prior | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	163,617	214,915
Term Loan Receivable, Originated Three Years Prior | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	145,792	181,659
Term Loan Receivable, Originated Three Years Prior | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	17,825	26,339
Term Loan Receivable, Originated Three Years Prior | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	6,917
Term Loan Receivable, Originated Three Years Prior | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	34,738	40,796
Term Loan Receivable, Originated Three Years Prior | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	34,212	39,351
Term Loan Receivable, Originated Three Years Prior | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	526	1,421
Term Loan Receivable, Originated Three Years Prior | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	24
Term Loan Receivable, Originated Three Years Prior | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	57,986	45,218
Term Loan Receivable, Originated Three Years Prior | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	57,956	45,187
Term Loan Receivable, Originated Three Years Prior | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	30	31
Term Loan Receivable, Originated Three Years Prior | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Three Years Prior | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,166	1,965
Term Loan Receivable, Originated Three Years Prior | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,166	1,965
Term Loan Receivable, Originated Three Years Prior | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	455,685	462,092
Term Loan Receivable, Originated Four Years Prior | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54,657	74,228
Term Loan Receivable, Originated Four Years Prior | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	51,866	68,007
Term Loan Receivable, Originated Four Years Prior | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	67	6,182
Term Loan Receivable, Originated Four Years Prior | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,724	39
Term Loan Receivable, Originated Four Years Prior | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	455	389
Term Loan Receivable, Originated Four Years Prior | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	455	389
Term Loan Receivable, Originated Four Years Prior | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	81,299	91,495
Term Loan Receivable, Originated Four Years Prior | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	81,160	91,059
Term Loan Receivable, Originated Four Years Prior | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	100
Term Loan Receivable, Originated Four Years Prior | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	139	336
Term Loan Receivable, Originated Four Years Prior | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,161	1,303
Term Loan Receivable, Originated Four Years Prior | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,161	1,303
Term Loan Receivable, Originated Four Years Prior | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	65,075	34,383
Term Loan Receivable, Originated Four Years Prior | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	50,974	34,383
Term Loan Receivable, Originated Four Years Prior | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	14,101	0
Term Loan Receivable, Originated Four Years Prior | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	195,894	217,883
Term Loan Receivable, Originated Four Years Prior | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	163,703	175,148
Term Loan Receivable, Originated Four Years Prior | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	25,274	37,762
Term Loan Receivable, Originated Four Years Prior | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,917	4,973
Term Loan Receivable, Originated Four Years Prior | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	33,796	27,415
Term Loan Receivable, Originated Four Years Prior | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	32,449	26,359
Term Loan Receivable, Originated Four Years Prior | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,323	114
Term Loan Receivable, Originated Four Years Prior | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	24	942
Term Loan Receivable, Originated Four Years Prior | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	22,494	14,285
Term Loan Receivable, Originated Four Years Prior | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	22,487	14,255
Term Loan Receivable, Originated Four Years Prior | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	7	30
Term Loan Receivable, Originated Four Years Prior | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Four Years Prior | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	854	711
Term Loan Receivable, Originated Four Years Prior | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	854	711
Term Loan Receivable, Originated Four Years Prior | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Five or More Years Prior
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,327,265	1,175,550
Term Loan Receivable, Originated Five or More Years Prior | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	118,361	83,313
Term Loan Receivable, Originated Five or More Years Prior | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	109,244	65,418
Term Loan Receivable, Originated Five or More Years Prior | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	7,323	8,043
Term Loan Receivable, Originated Five or More Years Prior | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,794	9,852
Term Loan Receivable, Originated Five or More Years Prior | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Five or More Years Prior | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Five or More Years Prior | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	936	1,009
Term Loan Receivable, Originated Five or More Years Prior | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	882	709
Term Loan Receivable, Originated Five or More Years Prior | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	246
Term Loan Receivable, Originated Five or More Years Prior | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	54	54
Term Loan Receivable, Originated Five or More Years Prior | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	284,645	297,057
Term Loan Receivable, Originated Five or More Years Prior | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	280,586	292,158
Term Loan Receivable, Originated Five or More Years Prior | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,296	1,520
Term Loan Receivable, Originated Five or More Years Prior | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,763	3,379
Term Loan Receivable, Originated Five or More Years Prior | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,297	7,127
Term Loan Receivable, Originated Five or More Years Prior | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	6,141	6,909
Term Loan Receivable, Originated Five or More Years Prior | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	62	112
Term Loan Receivable, Originated Five or More Years Prior | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	94	106
Term Loan Receivable, Originated Five or More Years Prior | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	106,420	106,328
Term Loan Receivable, Originated Five or More Years Prior | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	105,380	104,972
Term Loan Receivable, Originated Five or More Years Prior | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	534	131
Term Loan Receivable, Originated Five or More Years Prior | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	506	1,225
Term Loan Receivable, Originated Five or More Years Prior | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	655,679	518,052
Term Loan Receivable, Originated Five or More Years Prior | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	587,138	419,900
Term Loan Receivable, Originated Five or More Years Prior | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	55,781	66,752
Term Loan Receivable, Originated Five or More Years Prior | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,760	31,400
Term Loan Receivable, Originated Five or More Years Prior | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	143,789	152,555
Term Loan Receivable, Originated Five or More Years Prior | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	137,363	141,376
Term Loan Receivable, Originated Five or More Years Prior | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,796	6,572
Term Loan Receivable, Originated Five or More Years Prior | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,630	4,607
Term Loan Receivable, Originated Five or More Years Prior | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,345	3,726
Term Loan Receivable, Originated Five or More Years Prior | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,279	3,641
Term Loan Receivable, Originated Five or More Years Prior | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	66	85
Term Loan Receivable, Originated Five or More Years Prior | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Five or More Years Prior | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Term Loan Receivable, Originated Five or More Years Prior | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,793	6,383
Term Loan Receivable, Originated Five or More Years Prior | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,749	6,373
Term Loan Receivable, Originated Five or More Years Prior | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	44	10
Revolving Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,002,030	1,052,047
Revolving Loans Receivable | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	359,593	377,686
Revolving Loans Receivable | Time and Demand Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	353,015	353,038
Revolving Loans Receivable | Time and Demand Loans | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	2,864	20,750
Revolving Loans Receivable | Time and Demand Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,714	3,898
Revolving Loans Receivable | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Revolving Loans Receivable | Commercial Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,897	14,604
Revolving Loans Receivable | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	508	3,165
Revolving Loans Receivable | Construction | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	508	2,907
Revolving Loans Receivable | Construction | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	258
Revolving Loans Receivable | Construction | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,974	1,981
Revolving Loans Receivable | Senior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,897	1,904
Revolving Loans Receivable | Senior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	77	77
Revolving Loans Receivable | Senior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	562,246	582,451
Revolving Loans Receivable | Junior Lien | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	559,189	579,068
Revolving Loans Receivable | Junior Lien | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10	10
Revolving Loans Receivable | Junior Lien | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,047	3,373
Revolving Loans Receivable | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,343	1,590
Revolving Loans Receivable | Multifamily | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,343	1,590
Revolving Loans Receivable | Multifamily | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Multifamily | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	4,506	4,142
Revolving Loans Receivable | Nonowner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	3,313	3,740
Revolving Loans Receivable | Nonowner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,037	129
Revolving Loans Receivable | Nonowner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	156	273
Revolving Loans Receivable | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,385	5,502
Revolving Loans Receivable | Owner Occupied Commercial Real Estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	5,271	5,282
Revolving Loans Receivable | Owner Occupied Commercial Real Estate | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	33	33
Revolving Loans Receivable | Owner Occupied Commercial Real Estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	81	187
Revolving Loans Receivable | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Automobiles | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Automobiles | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	0	0
Revolving Loans Receivable | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Revolving Loans Receivable | Consumer Credit Cards | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	10,617	12,360
Revolving Loans Receivable | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	41,961	48,566
Revolving Loans Receivable | Other Consumer Loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	41,949	48,563
Revolving Loans Receivable | Other Consumer Loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 12	$ 3

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 6,732,580	$ 6,761,183
Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,224,591	1,555,986
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,210,694	1,541,382
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	13,897	14,604
Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	424,016	427,221
Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,875,375	1,750,592
Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,254,142	1,144,323
Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	621,233	606,269
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,231,890	2,211,569
Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	405,720	371,239
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,442,845	1,421,151
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	383,325	419,179
Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	976,708	815,815
Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	886,367	712,800
Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,617	12,360
Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	79,724	90,655
Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,440	8,072
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	158	146
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	23	97
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	135	49
Financial Asset, 30 to 59 Days Past Due [Member] | Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	936
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,354	3,883
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,217	1,775
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,137	2,108
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	177	237
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	175	18
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	2	219
Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,751	2,870
Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,363	2,090
Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	50	52
Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	338	728
Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,698	2,566
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	478	62
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	459	28
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	19	34
Financial Asset, 60 to 89 Days Past Due [Member] | Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	824	1,492
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	272	660
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	552	832
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	45	160
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	104
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	45	56
Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	351	852
Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	83	417
Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	22	39
Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	246	396
Non Accrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	30,676	45,541
Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,554	3,317
Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,554	3,317
Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Non Accrual Loans [Member] | Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	54	54
Non Accrual Loans [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,046	6,824
Non Accrual Loans [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,036	3,489
Non Accrual Loans [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,010	3,335
Non Accrual Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	19,782	35,072
Non Accrual Loans [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	435	460
Non Accrual Loans [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	17,783	31,822
Non Accrual Loans [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,564	2,790
Non Accrual Loans [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	240	274
Non Accrual Loans [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	184	261
Non Accrual Loans [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Non Accrual Loans [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	56	13
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,135	1,523
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	33	112
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	23
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	33	89
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	411	769
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	172	267
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	239	502
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	691	639
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	158	94
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	25	123
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	508	422
Financial Asset, Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	38,949	57,702
Financial Asset, Past Due | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,223	3,637
Financial Asset, Past Due | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,036	3,465
Financial Asset, Past Due | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	187	172
Financial Asset, Past Due | Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	54	990
Financial Asset, Past Due | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,635	12,968
Financial Asset, Past Due | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,697	6,191
Financial Asset, Past Due | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,938	6,777
Financial Asset, Past Due | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	20,004	35,472
Financial Asset, Past Due | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	435	460
Financial Asset, Past Due | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	17,958	31,944
Financial Asset, Past Due | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,611	3,068
Financial Asset, Past Due | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,033	4,635
Financial Asset, Past Due | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,788	2,862
Financial Asset, Past Due | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	97	214
Financial Asset, Past Due | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,148	1,559
Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,693,631	6,703,481
Financial Asset, Not Past Due | Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,219,368	1,552,349
Financial Asset, Not Past Due | Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,205,658	1,537,917
Financial Asset, Not Past Due | Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	13,710	14,432
Financial Asset, Not Past Due | Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	423,962	426,231
Financial Asset, Not Past Due | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,864,740	1,737,624
Financial Asset, Not Past Due | Residential real estate [Member] | Senior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,248,445	1,138,132
Financial Asset, Not Past Due | Residential real estate [Member] | Junior Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	616,295	599,492
Financial Asset, Not Past Due | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,211,886	2,176,097
Financial Asset, Not Past Due | Commercial Real Estate [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	405,285	370,779
Financial Asset, Not Past Due | Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,424,887	1,389,207
Financial Asset, Not Past Due | Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	381,714	416,111
Financial Asset, Not Past Due | Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	973,675	811,180
Financial Asset, Not Past Due | Loans to individuals [Member] | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	884,579	709,938
Financial Asset, Not Past Due | Loans to individuals [Member] | Consumer Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,520	12,146
Financial Asset, Not Past Due | Loans to individuals [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 78,576	$ 89,096

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 28,474		$ 28,474		$ 34,086
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	41,980		41,980		40,124
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	36,443		41,123
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	131		438
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,612		9,612		19,967
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,692		9,692		25,207
Related allowance	980		980		4,906
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,318		9,228
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	19		50
Recorded investment	38,086		38,086		54,053
Unpaid principal balance	51,672		51,672		65,331
Impaired Financing Receivable, Average Recorded Investment	45,761		50,351
Impaired Financing Receivable, Interest Income, Cash Basis Method	150		488
Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,836		4,836		2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,308		15,308		2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,858		9,266
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3		50
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,899		1,899		4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,898		1,898		9,377
Related allowance	479		479		1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,842		1,820
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	19		50
Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	54		54		54
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	53		53		53
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	54		54
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,910		9,910		10,939
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,101		12,101		13,258
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,060		10,504
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	54		275
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	13,176		13,176		20,650
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,981		13,981		23,641
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	15,967		20,813
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	68		101
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,713		7,713		15,757
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,794		7,794		15,830
Related allowance	501		501		3,638
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,476		7,408
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	498		498		418
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	537		537		447
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	504		486
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6		12
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,836		4,836		2,025
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,308		15,308		2,725
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,858		9,266
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3		50
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,899		1,899		4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,898		1,898		9,377
Related allowance	479		479		1,268
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,842		1,820
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	19		50
Senior Lien | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,599		5,599		6,062
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,003		7,003		7,575
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,558		5,734
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	34		210
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Junior Lien | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,311		4,311		4,877
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,098		5,098		5,683
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,502		4,770
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	20		65
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Multifamily | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		1
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		82
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	435		435		459
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	456		456		470
Related allowance	103		103		116
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	439		451
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,531		11,531		16,786
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,147		12,147		19,459
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	13,633		18,050
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	4		15
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,917		6,917		15,060
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,979		6,979		15,122
Related allowance	338		338		3,508
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,917		6,917
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Owner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,645		1,645		3,863
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,834		1,834		4,100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,334		2,763
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	64		86
Impaired Financing Receivable, with Related Allowance, Recorded Investment	361		361		238
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	359		359		238
Related allowance	60		60		14
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	120		40
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Automobiles | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	442		442		405
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	476		476		430
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	448		433
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6		12
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0		0
Other Consumer Loans | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	56		56		13
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	61		61		17
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	56		53
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		$ 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 0		$ 0
Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		$ 26,940		$ 28,911
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		108		349
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		23,830		18,399
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		19		54
Impaired Financing Receivable, Average Recorded Investment		50,770		47,310
Impaired Financing Receivable, Interest Income, Cash Basis Method		127		403
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		1,918		4,062
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		10		15
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		6,423		4,569
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		16		45
Originated Loans [Member] | Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		18		6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Originated Loans [Member] | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		10,198		10,380
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		72		235
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Originated Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		14,312		13,994
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		23		90
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		17,407		13,830
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		3		9
Originated Loans [Member] | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		494		469
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		3		9
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Acquired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		3,306		3,447
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		77		94
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Impaired Financing Receivable, Average Recorded Investment		3,306		3,447
Impaired Financing Receivable, Interest Income, Cash Basis Method		77		94
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		74		74
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Acquired Loans [Member] | Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		308		137
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Acquired Loans [Member] | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		1,473		1,772
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		1		18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		1,440		1,453
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		76		76
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Acquired Loans [Member] | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		11		11
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		$ 0		$ 0

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructurings [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 23,620	$ 23,252
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	75	71
Letter of Credit [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	60	60
Unused lines of Credit [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	15	11
Accrual Loans [Member] [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Financing Receivable, Troubled Debt Restructuring	7,410	8,512
Non Accrual Loans [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 16,210	$ 14,740

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)Contract	Sep. 30, 2020USD ($)Contract	Sep. 30, 2021USD ($)Contract	Sep. 30, 2020USD ($)Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	15	17	28	33
Total Pre-Modification Outstanding Recorded Investment	$ 1,160	$ 1,309	$ 8,140	$ 1,781
Post- Modification Outstanding Recorded Investment	1,144	1,165	4,191	1,607
Troubled Debt Restructuring [Policy Text Block]	$ 0	$ 489	$ 0	$ 489
Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	5		6
Total Pre-Modification Outstanding Recorded Investment	$ 206		$ 6,803
Post- Modification Outstanding Recorded Investment	202		2,895
Troubled Debt Restructuring [Policy Text Block]	$ 0		$ 0
Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	5		13	16
Total Pre-Modification Outstanding Recorded Investment	$ 230		$ 520	$ 877
Post- Modification Outstanding Recorded Investment	221		500	729
Troubled Debt Restructuring [Policy Text Block]	$ 0		$ 0	$ 0
Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract			7	14
Total Pre-Modification Outstanding Recorded Investment			$ 173	$ 263
Post- Modification Outstanding Recorded Investment			151	245
Troubled Debt Restructuring [Policy Text Block]			$ 0	$ 0
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	2			2
Total Pre-Modification Outstanding Recorded Investment	$ 644			$ 12
Post- Modification Outstanding Recorded Investment	645			8
Troubled Debt Restructuring [Policy Text Block]	$ 0			$ 0
Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	5		6
Total Pre-Modification Outstanding Recorded Investment	$ 206		$ 6,803
Post- Modification Outstanding Recorded Investment	202		2,895
Troubled Debt Restructuring [Policy Text Block]	$ 0		$ 0
Senior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	3		10
Total Pre-Modification Outstanding Recorded Investment	$ 113		$ 390
Post- Modification Outstanding Recorded Investment	109		375
Troubled Debt Restructuring [Policy Text Block]	$ 0		$ 0
Junior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	2		3
Total Pre-Modification Outstanding Recorded Investment	$ 117		$ 130
Post- Modification Outstanding Recorded Investment	112		125
Troubled Debt Restructuring [Policy Text Block]	$ 0		$ 0
Automobiles | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	3		7
Total Pre-Modification Outstanding Recorded Investment	$ 80		$ 173
Post- Modification Outstanding Recorded Investment	76		151
Troubled Debt Restructuring [Policy Text Block]	$ 0		$ 0
Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract		12
Total Pre-Modification Outstanding Recorded Investment		$ 613
Post- Modification Outstanding Recorded Investment		477
Troubled Debt Restructuring [Policy Text Block]		$ 0
Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	3	4
Total Pre-Modification Outstanding Recorded Investment	$ 80	$ 67
Post- Modification Outstanding Recorded Investment	76	63
Troubled Debt Restructuring [Policy Text Block]	$ 0	$ 0
Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract		1		1
Total Pre-Modification Outstanding Recorded Investment		$ 629		$ 629
Post- Modification Outstanding Recorded Investment		625		625
Troubled Debt Restructuring [Policy Text Block]		489		489
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	2		2
Total Pre-Modification Outstanding Recorded Investment	$ 644		$ 644
Post- Modification Outstanding Recorded Investment	645		645
Troubled Debt Restructuring [Policy Text Block]	0		$ 0
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract			2
Total Pre-Modification Outstanding Recorded Investment			$ 644
Post- Modification Outstanding Recorded Investment			645
Troubled Debt Restructuring [Policy Text Block]			0
Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0	0	0	0
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Extended Maturity [Member] | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0	0
Extended Maturity [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment			0	0
Extended Maturity [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0			0
Extended Maturity [Member] | Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Extended Maturity [Member] | Senior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Extended Maturity [Member] | Junior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Extended Maturity [Member] | Automobiles | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Extended Maturity [Member] | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment		0
Extended Maturity [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0	0
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment		0		0
Extended Maturity [Member] | Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Extended Maturity [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment			0
Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	130	705	329	776
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	113		219	33
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment			110	114
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0			0
Contractual Interest Rate Reduction [Member] | Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Contractual Interest Rate Reduction [Member] | Senior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	113		219
Contractual Interest Rate Reduction [Member] | Junior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Contractual Interest Rate Reduction [Member] | Automobiles | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	17		110
Contractual Interest Rate Reduction [Member] | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment		33
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	17	43
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment		629		629
Contractual Interest Rate Reduction [Member] | Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		0
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment			0
Contractual Payment Modification [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	1,030	604	7,811	1,005
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	206		6,803
Contractual Payment Modification [Member] | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	117		301	844
Contractual Payment Modification [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment			63	149
Contractual Payment Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	644			12
Contractual Payment Modification [Member] | Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	206		6,803
Contractual Payment Modification [Member] | Senior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	0		171
Contractual Payment Modification [Member] | Junior Lien | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	117		130
Contractual Payment Modification [Member] | Automobiles | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	63		63
Contractual Payment Modification [Member] | Residential real estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment		580
Contractual Payment Modification [Member] | Loans to individuals [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	63	24
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment		$ 0		$ 0
Contractual Payment Modification [Member] | Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment	$ 644		644
Contractual Payment Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Pre-Modification Outstanding Recorded Investment			$ 644

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Troubled Debt Restructuring is 90 Days or More Past Due (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)Contract	Sep. 30, 2020USD ($)Contract	Sep. 30, 2021USD ($)Contract	Sep. 30, 2020USD ($)Contract
Financing Receivable, Past Due [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract	0	3	0	4
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $	$ 0	$ 190	$ 0	$ 240
Residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract			0	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $			$ 0	$ 50
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract	0	1	0	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $	$ 0	$ 112	$ 0	$ 112
Loans to individuals [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract	0	2	0	2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $	$ 0	$ 78	$ 0	$ 78

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 97,038		$ 101,309
Charge-offs	(2,906)		(11,510)
Recoveries	629		2,036
Provision for credit losses	(576)		2,350
Ending Balance	94,185	$ 88,307	94,185	$ 88,307	$ 101,309
Ending balance: individually evaluated for impaired	980	7,418	980	7,418
Ending balance: collectively evaluated for impaired	93,205	80,889	93,205	80,889
Loans and Leases Receivable, Net of Deferred Income	(6,732,580)	(6,949,716)	(6,732,580)	(6,949,716)	(6,761,183)
Ending balance: individually evaluated for impaired	26,148	36,969	26,148	36,969
Ending balance: collectively evaluated for impaired	6,706,432	6,912,747	6,706,432	6,912,747
Provision for credit losses	330	11,212	1,353	49,038
Commercial, financial, agricultural and other [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending Balance		25,488		25,488
Real estate construction [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending Balance		3,508		3,508
Residential real estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending Balance		8,252		8,252
Commercial Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending Balance		42,244		42,244
Loans to individuals [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending Balance		8,815		8,815
Commercial, financial, agricultural and other [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	21,466		17,187
Charge-offs	(2,066)		(6,522)
Recoveries	106		299
Provision for credit losses	(1,644)		6,898
Ending Balance	17,862	25,488	17,862	25,488	17,187
Ending balance: individually evaluated for impaired	479	1,497	479	1,497
Ending balance: collectively evaluated for impaired	17,383	23,991	17,383	23,991
Loans and Leases Receivable, Net of Deferred Income	(1,224,591)	(1,736,736)	(1,224,591)	(1,736,736)	(1,555,986)
Ending balance: individually evaluated for impaired	5,561	5,048	5,561	5,048
Ending balance: collectively evaluated for impaired	1,219,030	1,731,688	1,219,030	1,731,688
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	21,098		16,838
Charge-offs	(2,059)		(6,397)
Recoveries	104		292
Provision for credit losses	(1,561)		6,849
Ending Balance	17,582		17,582		16,838
Ending balance: individually evaluated for impaired	479		479
Ending balance: collectively evaluated for impaired	17,103		17,103
Loans and Leases Receivable, Net of Deferred Income	(1,210,694)		(1,210,694)		(1,541,382)
Ending balance: individually evaluated for impaired	5,561		5,561
Ending balance: collectively evaluated for impaired	1,205,133		1,205,133
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	368		349
Charge-offs	(7)		(125)
Recoveries	2		7
Provision for credit losses	(83)		49
Ending Balance	280		280		349
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	280		280
Loans and Leases Receivable, Net of Deferred Income	(13,897)		(13,897)		(14,604)
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	13,897		13,897
Construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,285		7,966
Charge-offs	0		0
Recoveries	0		135
Provision for credit losses	48		(3,768)
Ending Balance	4,333		4,333		7,966
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	4,333		4,333
Loans and Leases Receivable, Net of Deferred Income	(424,016)		(424,016)
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	424,016		424,016
Residential real estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	12,933		14,358
Charge-offs	(11)		(130)
Recoveries	98		309
Provision for credit losses	(215)		(1,732)
Ending Balance	12,805	8,252	12,805	8,252	14,358
Ending balance: individually evaluated for impaired	0	0	0	0
Ending balance: collectively evaluated for impaired	12,805	8,252	12,805	8,252
Loans and Leases Receivable, Net of Deferred Income	(1,875,375)	(1,744,020)	(1,875,375)	(1,744,020)	(1,750,592)
Ending balance: individually evaluated for impaired	254	1,226	254	1,226
Ending balance: collectively evaluated for impaired	1,875,121	1,742,794	1,875,121	1,742,794
Residential real estate [Member] | Senior Lien
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	7,394		7,919
Charge-offs	0		(36)
Recoveries	24		206
Provision for credit losses	39		(632)
Ending Balance	7,457		7,457		7,919
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	7,457		7,457
Loans and Leases Receivable, Net of Deferred Income	(1,254,142)		(1,254,142)		(1,144,323)
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	1,254,142		1,254,142
Residential real estate [Member] | Junior Lien
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5,539		6,439
Charge-offs	(11)		(94)
Recoveries	74		103
Provision for credit losses	(254)		(1,100)
Ending Balance	5,348		5,348		6,439
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	5,348		5,348
Loans and Leases Receivable, Net of Deferred Income	(621,233)		(621,233)		(606,269)
Ending balance: individually evaluated for impaired	254		254
Ending balance: collectively evaluated for impaired	620,979		620,979
Commercial Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	35,795		41,953
Charge-offs	(102)		(1,659)
Recoveries	90		130
Provision for credit losses	(1,143)		(5,784)
Ending Balance	34,640	42,244	34,640	42,244	41,953
Ending balance: individually evaluated for impaired	501	5,921	501	5,921
Ending balance: collectively evaluated for impaired	34,139	36,323	34,139	36,323
Loans and Leases Receivable, Net of Deferred Income	(2,231,890)	(2,215,311)	(2,231,890)	(2,215,311)	(2,211,569)
Ending balance: individually evaluated for impaired	20,333	30,387	20,333	30,387
Ending balance: collectively evaluated for impaired	2,211,557	2,184,924	2,211,557	2,184,924
Commercial Real Estate [Member] | Multifamily
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,379		6,240
Charge-offs	0		(1)
Recoveries	0		0
Provision for credit losses	(548)		(2,408)
Ending Balance	3,831		3,831		6,240
Ending balance: individually evaluated for impaired	103		103
Ending balance: collectively evaluated for impaired	3,728		3,728
Loans and Leases Receivable, Net of Deferred Income	(405,720)		(405,720)		(371,239)
Ending balance: individually evaluated for impaired	435		435
Ending balance: collectively evaluated for impaired	405,285		405,285
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	26,911		28,414
Charge-offs	0		(1,556)
Recoveries	80		120
Provision for credit losses	(893)		(880)
Ending Balance	26,098		26,098		28,414
Ending balance: individually evaluated for impaired	338		338
Ending balance: collectively evaluated for impaired	25,760		25,760
Loans and Leases Receivable, Net of Deferred Income	(1,442,845)		(1,442,845)		(1,421,151)
Ending balance: individually evaluated for impaired	18,314		18,314
Ending balance: collectively evaluated for impaired	1,424,531		1,424,531
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,505		7,299
Charge-offs	(102)		(102)
Recoveries	10		10
Provision for credit losses	298		(2,496)
Ending Balance	4,711		4,711		7,299
Ending balance: individually evaluated for impaired	60		60
Ending balance: collectively evaluated for impaired	4,651		4,651
Loans and Leases Receivable, Net of Deferred Income	(383,325)		(383,325)		(419,179)
Ending balance: individually evaluated for impaired	1,584		1,584
Ending balance: collectively evaluated for impaired	381,741		381,741
Loans to individuals [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	22,559		19,845
Charge-offs	(727)		(3,199)
Recoveries	335		1,163
Provision for credit losses	2,378		6,736
Ending Balance	24,545	8,815	24,545	8,815	19,845
Ending balance: individually evaluated for impaired	0	0	0	0
Ending balance: collectively evaluated for impaired	24,545	8,815	24,545	8,815
Loans and Leases Receivable, Net of Deferred Income	(976,708)	(800,660)	(976,708)	(800,660)	(815,815)
Ending balance: individually evaluated for impaired	0	0	0	0
Ending balance: collectively evaluated for impaired	976,708	800,660	976,708	800,660
Loans to individuals [Member] | Automobiles
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,298		16,133
Charge-offs	(331)		(1,399)
Recoveries	251		826
Provision for credit losses	1,984		5,642
Ending Balance	21,202		21,202		16,133
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	21,202		21,202
Loans and Leases Receivable, Net of Deferred Income	(886,367)		(886,367)		(712,800)
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	886,367		886,367
Loans to individuals [Member] | Consumer Credit Cards
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	528		635
Charge-offs	(125)		(372)
Recoveries	9		51
Provision for credit losses	84		182
Ending Balance	496		496		635
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	496		496
Loans and Leases Receivable, Net of Deferred Income	(10,617)		(10,617)		(12,360)
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	10,617		10,617
Loans to individuals [Member] | Other Consumer Loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,733		3,077
Charge-offs	(271)		(1,428)
Recoveries	75		286
Provision for credit losses	310		912
Ending Balance	2,847		2,847		3,077
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	2,847		2,847
Loans and Leases Receivable, Net of Deferred Income	(79,724)		(79,724)		(90,655)
Ending balance: individually evaluated for impaired	0		0
Ending balance: collectively evaluated for impaired	79,724		79,724
Real estate construction [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending Balance		3,508		3,508
Ending balance: individually evaluated for impaired		0		0
Ending balance: collectively evaluated for impaired		3,508		3,508
Loans and Leases Receivable, Net of Deferred Income	$ (424,016)	(452,989)	$ (424,016)	(452,989)	$ (427,221)
Ending balance: individually evaluated for impaired		308		308
Ending balance: collectively evaluated for impaired		452,681		452,681
Acquired Loans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		1,859		52
Charge-offs		(202)		(502)
Recoveries		28		76
Provision for credit losses				2,352
Ending Balance		1,978		1,978
Provision for credit losses		293
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		332
Charge-offs		0
Recoveries		13
Ending Balance		336		336
Provision for credit losses		(9)
Acquired Loans [Member] | Real estate construction [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		171
Charge-offs		0
Recoveries		0
Ending Balance		0		0
Provision for credit losses		(171)
Acquired Loans [Member] | Residential real estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		0
Charge-offs		(122)
Recoveries		13
Ending Balance		0		0
Provision for credit losses		109
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		1,356
Charge-offs		0
Recoveries		0
Ending Balance		1,642		1,642
Provision for credit losses		286
Acquired Loans [Member] | Loans to individuals [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		0
Charge-offs		(80)
Recoveries		2
Ending Balance		0		0
Provision for credit losses		78
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				13
Charge-offs				0
Recoveries				28
Provision for credit losses				295
Ending Balance		336		336
Acquired Loans [Member] | Residential real estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				2
Charge-offs				(213)
Recoveries				38
Provision for credit losses				173
Ending Balance		0		0
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				37
Charge-offs				(2)
Recoveries				0
Provision for credit losses				1,607
Ending Balance		1,642		1,642
Acquired Loans [Member] | Loans to individuals [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				0
Charge-offs				(287)
Recoveries				10
Provision for credit losses				277
Ending Balance		0		0
Acquired Loans [Member] | Real estate construction [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				0
Charge-offs				0
Recoveries				0
Provision for credit losses				0
Ending Balance		0		0
Originated Loans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		79,582		51,585
Charge-offs		(4,705)		(13,259)
Recoveries		533		1,317
Provision for credit losses				46,686
Ending Balance		86,329		86,329
Provision for credit losses		10,919
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		24,812
Charge-offs		(3,395)
Recoveries		44
Ending Balance		25,152		25,152
Provision for credit losses		3,691
Originated Loans [Member] | Real estate construction [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		3,067
Charge-offs		0
Recoveries		0
Ending Balance		3,508		3,508
Provision for credit losses		441
Originated Loans [Member] | Residential real estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		9,239
Charge-offs		(161)
Recoveries		153
Ending Balance		8,252		8,252
Provision for credit losses		(979)
Originated Loans [Member] | Commercial Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		33,130
Charge-offs		0
Recoveries		110
Ending Balance		40,602		40,602
Provision for credit losses		7,362
Originated Loans [Member] | Loans to individuals [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		9,334
Charge-offs		(1,149)
Recoveries		226
Ending Balance		8,815		8,815
Provision for credit losses		404
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				20,221
Charge-offs				(5,166)
Recoveries				161
Provision for credit losses				9,936
Ending Balance		25,152		25,152
Originated Loans [Member] | Residential real estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				4,091
Charge-offs				(720)
Recoveries				274
Provision for credit losses				4,607
Ending Balance		8,252		8,252
Originated Loans [Member] | Commercial Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				19,731
Charge-offs				(2,415)
Recoveries				154
Provision for credit losses				23,132
Ending Balance		40,602		40,602
Originated Loans [Member] | Loans to individuals [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				4,984
Charge-offs				(4,958)
Recoveries				702
Provision for credit losses				8,087
Ending Balance		8,815		8,815
Originated Loans [Member] | Real estate construction [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				2,558
Charge-offs				0
Recoveries				26
Provision for credit losses				924
Ending Balance		$ 3,508		$ 3,508

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non Accrual Status Of Loans After Number Of Days Past Due			90 days
Default Status Of TDRs After Number Of Days Past Due			90 days
Charge-offs	$ 2,906,000		$ 11,510,000
Unfunded commitments related to nonperforming loans	200,000		200,000		$ 200,000
Off balance sheet reserve to nonperforming loans					26,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	$ 0	0	$ 0
Total gains or losses included in earnings	0	0	0	0
Recorded investment	38,086,000		38,086,000		54,053,000
Loans with modifications to rate and payment due to reamortization	86,000	694,000	284,000	766,000
Loans and Leases Receivable, Gross	6,732,580,000		6,732,580,000		6,761,183,000
Loans and Leases Receivable, Net of Deferred Income	6,732,580,000	6,949,716,000	6,732,580,000	6,949,716,000	6,761,183,000
Unearned Deferred (Fees) Costs on Loans	2,600,000		2,600,000		6,000,000
Unearned Premiums	6,300,000		$ 6,300,000		7,000,000
Forecasted Value, National Unemployment, Percent			5.13%
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery			$ 9,500,000	12,400,000
Loan Pay Off	6,900,000		6,900,000
Specific Reserve Related to Loan Pay Off	300,000		$ 300,000
Weighted average [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Value, National Unemployment, Percent			5.00%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Value, National Unemployment, Percent			5.13%
Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,210,694,000		$ 1,210,694,000		1,541,382,000
Originated Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs		4,705,000		13,259,000
Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	2,066,000		6,522,000
Loans and Leases Receivable, Gross	1,224,591,000		1,224,591,000		1,555,986,000
Loans and Leases Receivable, Net of Deferred Income	1,224,591,000	1,736,736,000	1,224,591,000	1,736,736,000	1,555,986,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	2,059,000		6,397,000
Loans and Leases Receivable, Gross	1,210,694,000		1,210,694,000		1,541,382,000
Loans and Leases Receivable, Net of Deferred Income	1,210,694,000		1,210,694,000		1,541,382,000
Loans And Leases Receivable, Paycheck Protection Program	152,100,000		152,100,000		478,900,000
Commercial, financial, agricultural and other [Member] | Originated Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs				5,166,000
Total Deferrals Still in Forbearance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	29,900,000	$ 65,400,000	$ 29,900,000	65,400,000	113,800,000
Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non Accrual Status Of Loans After Number Of Days Past Due			150 days
Nonaccrual Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for sale, Amount	0		$ 0		$ 13,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net			400,000	$ 0
Nonaccrual Commercial Loans Transferred to HFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for sale, Amount	$ 5,000,000		$ 5,000,000

Leases Operating Lease Assets a

Leases Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 40,245		$ 40,245		$ 42,617
Operating Lease, Liability	$ 44,473		44,473		$ 46,819
Operating Lease, Cost			$ 1,190	$ 2,007
Operating Lease, Weighted Average Remaining Lease Term	14 years 4 months 9 days	15 years 1 month 6 days	14 years 4 months 9 days	15 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	3.34%	3.42%	3.34%	3.42%
Operating Leases, Rent Expense	$ 1,202	$ 1,545	$ 3,603	$ 4,281

Leases Lease Liablity Maturity

Leases Lease Liablity Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 4,623
Operating Leases, Future Minimum Payments, Due in Two Years	4,591
Operating Leases, Future Minimum Payments, Due in Three Years	4,428
Operating Leases, Future Minimum Payments, Due in Four Years	4,306
Operating Leases, Future Minimum Payments, Due in Five Years	3,849
Operating Leases, Future Minimum Payments, Due Thereafter	35,364
Operating Leases, Future Minimum Payments Due	57,161
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	12,688
Operating Lease, Liability	$ 44,473	$ 46,819

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 0	$ 0

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities - Quantitative Inputs and Assumptions Used in Level 3 Fair Value Measurements (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Investments	$ 12,719,000	$ 12,227,000
Assets	1,206,844,000	938,309,000
Impaired Loans [Member] | Reserve Study [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets	$ 657,000	$ 798,000
Impaired Loans [Member] | Reserve Study [Member] | Discount rates [Member] | Weighted average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	10.00%	10.00%
Impaired Loans [Member] | Reserve Study [Member] | Gas per MCF [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Monetary	$ 2	$ 1.46
Impaired Loans [Member] | Reserve Study [Member] | Gas per MCF [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Monetary	2	1.48
Impaired Loans [Member] | Reserve Study [Member] | Oil per BBL/d [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Monetary	50	36
Impaired Loans [Member] | Reserve Study [Member] | Oil per BBL/d [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Monetary	50	36
Impaired Loans [Member] | Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets	0
Limited Partnership Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets	14,613,000	6,619,000
Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Investments	1,670,000	1,670,000
Assets	$ 16,283,000	$ 8,289,000

Fair Values of Assets and Lia_4

Fair Values of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 1,124,956		$ 831,223
Other investments	12,719		12,227
Loans Held for Sale	19,925		33,436
Premises and equipment, net			442
Other Assets	49,244	[1]	60,981	[2]
Total Assets	1,206,844		938,309
Other Liabilities	38,743	[1]	61,308	[2]
Total Liabilities	38,743		61,308
Limited Partnership Investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	14,613		6,619
US Government Agencies Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	5,982		7,230
US Government Agency Debt Securities Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	393,707		191,180
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	685,426		496,033
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	991		100,998
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	9,610		11,397
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	29,240		24,385
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Other investments	0		0
Loans Held for Sale	0		0
Premises and equipment, net			0
Other Assets	0	[1]	0	[2]
Total Assets	0		0
Other Liabilities	0	[1]	0	[2]
Total Liabilities	0		0
Level 1 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 1 [Member] | US Government Agency Debt Securities Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 1 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	1,124,956		831,223
Other investments	11,049		10,557
Loans Held for Sale	19,925		33,436
Premises and equipment, net			442
Other Assets	34,631	[1]	54,362	[2]
Total Assets	1,190,561		930,020
Other Liabilities	38,743	[1]	61,308	[2]
Total Liabilities	38,743		61,308
Level 2 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	5,982		7,230
Level 2 [Member] | US Government Agency Debt Securities Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	393,707		191,180
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	685,426		496,033
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	991		100,998
Level 2 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	9,610		11,397
Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	29,240		24,385
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Other investments	1,670		1,670
Loans Held for Sale	0		0
Premises and equipment, net			0
Other Assets	14,613	[1]	6,619	[2]
Total Assets	16,283		8,289
Other Liabilities	0	[1]	0	[2]
Total Liabilities	0		0
Level 3 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 3 [Member] | US Government Agency Debt Securities Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 3 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	0		0
Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 0		$ 0
[1]	Hedging and non-hedging interest rate derivatives and limited partnership investments
[2]	on-hedging interest rate derivatives and limited partnership investments

Fair Values of Assets and Lia_5

Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 9,118	$ 8,076	$ 8,290	$ 7,465
Total gains or losses included in earnings	0	0	0	0
Total gains or losses included in other comprehensive income	0	0	0	0
Purchases	7,194	140	8,113	751
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(29)	0	(120)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Balance, end of period	16,283	8,216	16,283	8,216
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0	0	0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,670	1,670	1,670	1,670
Total gains or losses included in earnings	0	0	0	0
Total gains or losses included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Balance, end of period	1,670	1,670	1,670	1,670
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0	0	0
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	7,448	6,406	6,620	5,795
Total gains or losses included in earnings	0	0	0	0
Total gains or losses included in other comprehensive income	0	0	0	0
Purchases	7,194	140	8,113	751
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(29)	0	(120)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Balance, end of period	14,613	6,546	14,613	6,546
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	$ 0	$ 0	$ 0	$ 0

Fair Values of Assets and Lia_6

Fair Values of Assets and Liabilities - Schedule of Assets Measured on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	$ 1,206,844	$ 938,309
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	37,106	49,147
Other real estate owned	631	1,319
Total Assets	37,737	50,466
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	0	0
Level 1 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate owned	0	0
Total Assets	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	1,190,561	930,020
Level 2 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	24,512	35,543
Other real estate owned	631	1,319
Total Assets	25,143	36,862
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets	16,283	8,289
Level 3 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	12,594	13,604
Other real estate owned	0	0
Total Assets	$ 12,594	$ 13,604

Fair Values of Assets and Lia_7

Fair Values of Assets and Liabilities - Losses Realized on Assets Measured on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Impaired loans	$ (745)	$ (3,695)	$ (2,537)	$ (9,940)
Other real estate owned	0	(4)	0	(4)
Total losses	$ (745)	$ (3,699)	$ (2,537)	$ (9,944)

Fair Values of Assets and Lia_8

Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	$ 94,579	$ 100,009
Interest-bearing deposits	240,095	256,572
Securities available for sale, at fair value	1,124,956	831,223
Debt Securities, Held-to-maturity	548,057	361,844
Other investments	12,719	12,227
Loans and Leases Receivable, Net of Deferred Income	6,732,580	6,761,183	$ 6,949,716
Deposits	7,936,485	7,438,666
Short-term borrowings	117,754	117,373
Subordinated debt	170,734	170,612
Long-term debt	5,746	56,258
Capital Lease Obligations	6,039	6,385
Level 1 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Securities available for sale, at fair value	0	0
Other investments	0	0
Level 2 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Securities available for sale, at fair value	1,124,956	831,223
Other investments	11,049	10,557
Level 3 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Securities available for sale, at fair value	0	0
Other investments	1,670	1,670
Carrying Amount [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	94,579	100,009
Interest-bearing deposits	240,095	256,572
Securities available for sale, at fair value	1,124,956	831,223
Debt Securities, Held-to-maturity	548,057	361,844
Other investments	12,719	12,227
Loans Held for sale, Amount	19,925	33,436
Loans and Leases Receivable, Net of Deferred Income	6,732,580	6,761,183
Deposits	7,936,485	7,438,666
Short-term borrowings	117,754	117,373
Subordinated debt	170,734	170,612
Long-term debt	5,746	56,258
Capital Lease Obligations	6,039	6,385
Estimate of Fair Value Measurement [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	94,579	100,009
Interest-bearing deposits	240,095	256,572
Securities available for sale, at fair value	1,124,956	831,223
Debt Securities, Held-to-maturity	547,343	369,851
Other investments	12,719	12,227
Loans Held for sale, Amount	19,925	33,436
Loans and Leases Receivable, Net of Deferred Income	7,118,886	7,202,763
Deposits	7,936,033	7,440,906
Short-term borrowings	117,602	117,037
Subordinated debt	175,178	165,665
Long-term debt	6,385	57,881
Capital Lease Obligations	6,039	6,385
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	94,579	100,009
Interest-bearing deposits	240,095	256,572
Securities available for sale, at fair value	0	0
Debt Securities, Held-to-maturity	0	0
Other investments	0	0
Loans Held for sale, Amount	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Deposits	0	0
Short-term borrowings	0	0
Subordinated debt	0	0
Long-term debt	0	0
Capital Lease Obligations	0	0
Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	0	0
Interest-bearing deposits	0	0
Securities available for sale, at fair value	1,124,956	831,223
Debt Securities, Held-to-maturity	547,343	369,851
Other investments	11,049	10,557
Loans Held for sale, Amount	19,925	33,436
Loans and Leases Receivable, Net of Deferred Income	24,512	35,543
Deposits	7,936,033	7,440,906
Short-term borrowings	117,602	117,037
Subordinated debt	0	0
Long-term debt	6,385	57,881
Capital Lease Obligations	6,039	6,385
Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	0	0
Interest-bearing deposits	0	0
Securities available for sale, at fair value	0	0
Debt Securities, Held-to-maturity	0	0
Other investments	1,670	1,670
Loans Held for sale, Amount	0	0
Loans and Leases Receivable, Net of Deferred Income	7,094,374	7,167,220
Deposits	0	0
Short-term borrowings	0	0
Subordinated debt	175,178	165,665
Long-term debt	0	0
Capital Lease Obligations	$ 0	$ 0

Fair Values of Assets and Lia_9

Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale Securities	$ 1,124,956		$ 1,124,956		$ 831,223
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	$ 0	0	$ 0
Impaired loans considered to be credit risk of non-collection	250		250
Updated appraisal requirement floor	250		250
Other real estate owned	502		502		1,215
Financial instrument of credit risk	100		100		$ 100
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Other Income, Assets and Liabilities Continue to be held		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0	0	0
Total gains or losses included in earnings	0	0	0	0
Derivatives mark to market	218	(160)	1,371	(2,122)
Forward Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivatives mark to market	(400)		(1,300)
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivatives mark to market	(265)	(102)	(666)	132
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0	0	0
Total gains or losses included in earnings	$ 0	$ 0	$ 0	$ 0
Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Swap Rates Term Used to Determine Yield Curve			3 years
Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Swap Rates Term Used to Determine Yield Curve			30 years

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)Derivatives	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)Derivatives	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Risk participation Agreements [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 218	$ (160)	$ 1,371	$ (2,122)
Risk Participation Agreements Purchased [Domain]
Risk participation Agreements [Line Items]
Number of interest rate swaps | Derivatives	35		35
Risk Participation Agreements Sold [Domain]
Risk participation Agreements [Line Items]
Number of interest rate swaps | Derivatives	16		16
Interest Rate Swap [Member]
Risk participation Agreements [Line Items]
Derivative Instruments Designated As Hedging Instruments Interest Expense	$ 248	208	$ 710	219
Derivative, Gain (Loss) on Derivative, Net	(272)		(115)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	2,890		2,890		$ 3,665
Derivative, Notional Amount	420,000		420,000		70,000
Forward Contracts [Member]
Risk participation Agreements [Line Items]
Derivative Liability, Cost Basis, Gross Asset	11,100		11,100		25,000
Derivative Liability, Fair Value, Gross Asset	12,500		12,500		28,400
Derivative Liability, Notional Amount, Gross Asset	38,500		38,500		47,900
Derivative, Gain (Loss) on Derivative, Net	(400)		(1,300)
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	(182)		(182)		483
Derivative, Notional Amount	36,000		36,000		65,000
Derivative, Gain (Loss) on Derivative, Net	(265)	(102)	(666)	132
Foreign Exchange [Member]
Risk participation Agreements [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	2	$ 3	7	$ 15
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	(17)		(17)		5
Derivative, Notional Amount	2,589		2,589		2,119
Derivative Liability, Cost Basis, Gross Asset	2,600		2,600		2,100
Derivative Liability, Fair Value, Gross Asset	2,600		2,600		$ 2,100
Interest Rate Macro Swap | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	350,000		$ 350,000
Derivative, Underlying			350.0 million
Interest Rate Swap Member - Debt | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	70,000		$ 70,000
2024 [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	30,000		30,000
2026 [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	40,000		40,000
Four Year Oiriginal Maturity | Interest Rate Macro Swap | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	175,000		175,000
Five Year Original Maturity | Interest Rate Macro Swap | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	150,000		150,000
Three Year Original Maturity | Interest Rate Macro Swap | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	$ 25,000		$ 25,000

Derivatives - Credit Value Adju

Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (1,422)	$ (2,792)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	704,383	631,446
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	(2,890)	(3,665)
Derivative, Notional Amount	420,000	70,000
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	66,137	66,527
interest Rate Collar [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	35,354	35,354
Credit Default Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	214,736	220,280
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	38,509	47,874
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	182	(483)
Derivative, Notional Amount	36,000	65,000
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	17	(5)
Derivative, Notional Amount	2,589	2,119
Short [Member] | Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 90,539	$ 78,522

Derivatives - Schedule of Chang

Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (202)	$ 142	$ 106	$ (611)
Derivative, Gain (Loss) on Derivative, Net	218	(160)	1,371	(2,122)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments Designated As Hedging Instruments Interest Expense	248	208	710	219
Derivative, Gain (Loss) on Derivative, Net	(272)		(115)
Derivative Instruments Designated As Hedging Instruments Interest Income	(520)	0	(825)	0
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(400)		(1,300)
Foreign Exchange [Member]
Derivative [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	2	3	7	15
Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (265)	$ (102)	$ (666)	$ 132

Goodwill - Additional Informati

Goodwill - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill Disclosure [Abstract]
Goodwill	$ 303,328,000		$ 303,328,000
Impairment charges on goodwill	$ 0	$ 0

Subordinated Debentures Schedul

Subordinated Debentures Schedule of Subordinated Debentures Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Subordinated debentures	$ 170,734	$ 170,612
First Commonwealth Bank 2028 [Member]
Debt Instrument [Line Items]
Subordinated debentures	49,383	49,314
First Commonwealth Bank 2033 [Member]
Debt Instrument [Line Items]
Subordinated debentures	49,184	49,131
First Commonwealth Capital Trust II [Member]
Debt Instrument [Line Items]
Subordinated debentures	30,929	30,929
First Commonwealth Capital Trust III [Member]
Debt Instrument [Line Items]
Subordinated debentures	$ 41,238	$ 41,238

Subordinated Debentures Subor_3

Subordinated Debentures Subordinated Debentures, Additional Information (Details) $ in Thousands	Sep. 30, 2021USD ($)
First Commonwealth Capital Trust II [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	$ 600
First Commonwealth Bank 2028 [Member]
Debt Instrument [Line Items]
Subordinated Debt Par Amount	50,000
Debt Issuance Costs, Gross	900
First Commonwealth Bank 2033 [Member]
Debt Instrument [Line Items]
Subordinated Debt Par Amount	50,000
Debt Issuance Costs, Gross	1,100
First Commonwealth Capital Trust III [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	$ 500

Revenue Recognition In-Scope an

Revenue Recognition In-Scope and Out-of-Scope Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Trust income	$ 3,118	$ 2,554	$ 8,340	$ 6,774
Service charges on deposit accounts	4,770	4,035	13,127	12,066
Insurance and retail brokerage commissions	2,218	2,156	6,368	5,982
Card-related interchange income	7,052	6,441	20,885	17,589
Derivatives mark to market	218	(160)	1,371	(2,122)
Gain on sale of loans and other assets.	2,480	1,871	6,281	3,151
Other income	2,101	1,827	6,022	5,314
Noninterest Income	27,245	26,769	80,686	67,854
In-Scope of Topic 606 [Member]
Trust income			8,340	6,774
Service charges on deposit accounts			13,127	12,066
Insurance and retail brokerage commissions			6,368	5,982
Card-related interchange income			20,885	17,589
Gain on sale of loans and other assets.	125	520	630	853
Other income	1,064	945	3,146	2,713
Noninterest Income	18,347	16,651	52,496	45,977
Out-Of-Scope of Topic 606 [Member]
Noninterest Income	$ 8,898	$ 10,118	$ 28,190	$ 21,877

Revenue Recognition Revenue R_2

Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Additional Information [Abstract]
Management Fees, Incentive Revenue (Deprecated 2018-01-31)	$ 0.3
Brokerage Commissions Revenue	$ 2.2	$ 0.8

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Sep. 30, 2021USD ($)
Subsequent Events [Abstract]
Stock Repurchase Program, Authorized Amount	$ 25
Loan Pay Off	6.9
Specific Reserve Related to Loan Pay Off	$ 0.3