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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 102,906	$ 92,522	$ 101,309
Ending Balance	117,718	102,906	92,522
Financing receivable, before allowance for credit loss	8,968,761	7,642,143
Financing Receivable, Allowance for Credit Loss, Writeoff	(33,267)	(9,845)	(13,058)
Recoveries	3,115	2,708	4,648
Provision for credit losses	17,759	17,521	(377)
Loans	8,968,761	7,642,143
Time and demand loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	1,187,300	1,023,824
Financing Receivable, Allowance for Credit Loss, Writeoff	(16,147)
Recoveries	260
Commercial credit cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	12,906	13,920
Financing Receivable, Allowance for Credit Loss, Writeoff	(105)
Recoveries	13
Senior Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	1,739,107	1,547,192
Financing Receivable, Allowance for Credit Loss, Writeoff	(246)
Recoveries	177
Junior Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	677,769	647,477
Financing Receivable, Allowance for Credit Loss, Writeoff	(315)
Recoveries	70
Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	551,142	431,151
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Recoveries	0
Nonowner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	1,772,785	1,510,347
Financing Receivable, Allowance for Credit Loss, Writeoff	(4,705)
Recoveries	127
Owner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	729,225	483,514
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,572)
Recoveries	24
Consumer Credit Cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	10,291	10,657
Financing Receivable, Allowance for Credit Loss, Writeoff	(290)
Recoveries	87
Other consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	69,389	76,547
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,353)
Recoveries	300
Equipment Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	232,944	79,674
Financing Receivable, Allowance for Credit Loss, Writeoff	(537)
Recoveries	0
Time and Demand Loans Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	110,199	94,288
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,410)
Recoveries	225
Construction Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	541,633	395,439
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Recoveries	0
Construction Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, before allowance for credit loss	56,102	117,662
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Recoveries	0
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	27,205
Commercial, financial, agricultural and other [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	22,650	18,093	17,187
Ending Balance	27,996	22,650	18,093
Financing Receivable, Allowance for Credit Loss, Writeoff	(19,199)	(2,361)	(7,020)
Recoveries	498	394	2,430
Provision for credit losses	4,630	6,524	5,496
Commercial, financial, agricultural and other [Member] | Time and demand loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	20,040	15,283
Ending Balance	22,819	20,040	15,283
Financing Receivable, Allowance for Credit Loss, Writeoff	(16,147)	(710)
Recoveries	260	202
Provision for credit losses	(751)	5,265
Commercial, financial, agricultural and other [Member] | Commercial credit cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	335	247	349
Ending Balance	278	335	247
Financing Receivable, Allowance for Credit Loss, Writeoff	(105)	(217)	(175)
Recoveries	13	71	18
Provision for credit losses	35	234	55
Commercial, financial, agricultural and other [Member] | Equipment Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,086	0
Ending Balance	3,399	1,086	0
Financing Receivable, Allowance for Credit Loss, Writeoff	(537)	0
Recoveries	0	0
Provision for credit losses	2,850	1,086
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,189	2,563
Ending Balance	1,500	1,189	2,563
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,410)	(1,434)
Recoveries	225	121
Provision for credit losses	2,496	(61)
Commercial, financial, agricultural and other [Member] | Time and demand loans Predisagreggation
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		17,846	16,838
Ending Balance			17,846
Financing Receivable, Allowance for Credit Loss, Writeoff			(6,845)
Recoveries			2,412
Provision for credit losses			5,441
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	19,417
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Time and demand loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	19,417
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Commercial credit cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	0
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Equipment Finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	0
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Time and Demand Loans Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	0
Real Estate Construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,822	4,220	7,966
Ending Balance	7,418	8,822	4,220
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	(9)
Recoveries	0	9	155
Provision for credit losses	(1,691)	4,593	(3,892)
Real Estate Construction [Member] | Construction Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	6,360	3,278
Ending Balance	6,448	6,360	3,278
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Recoveries	0	9
Provision for credit losses	(139)	3,073
Real Estate Construction [Member] | Construction Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,462	942
Ending Balance	970	2,462	942
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Recoveries	0	0
Provision for credit losses	(1,552)	1,520
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	287
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment | Construction Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	227
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment | Construction Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	60
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	28,804	33,376	41,953
Ending Balance	37,071	28,804	33,376
Financing Receivable, Allowance for Credit Loss, Writeoff	(6,277)	(2,487)	(1,659)
Recoveries	151	769	135
Provision for credit losses	7,422	(2,854)	(7,053)
Commercial real estate [Member] | Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,726	3,561	6,240
Ending Balance	5,233	4,726	3,561
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(411)	(1)
Recoveries	0	411	0
Provision for credit losses	273	1,165	(2,678)
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	16,426	24,838	28,414
Ending Balance	19,995	16,426	24,838
Financing Receivable, Allowance for Credit Loss, Writeoff	(4,705)	(1,836)	(1,556)
Recoveries	127	342	125
Provision for credit losses	5,408	(6,918)	(2,145)
Commercial real estate [Member] | Owner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	7,652	4,977	7,299
Ending Balance	11,843	7,652	4,977
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,572)	(240)	(102)
Recoveries	24	16	10
Provision for credit losses	1,741	2,899	(2,230)
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	6,971
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	234
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Nonowner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	2,739
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Owner Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	3,998
Loans To Individuals [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	21,218	24,208	19,845
Ending Balance	21,332	21,218	24,208
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,230)	(4,658)	(4,061)
Recoveries	2,219	1,349	1,460
Provision for credit losses	5,122	319	6,964
Loans To Individuals [Member] | Automobiles
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	18,819	21,392	16,133
Ending Balance	19,142	18,819	21,392
Financing Receivable, Allowance for Credit Loss, Writeoff	(5,587)	(2,639)	(1,792)
Recoveries	1,832	787	1,016
Provision for credit losses	4,075	(721)	6,035
Loans To Individuals [Member] | Consumer Credit Cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	412	496	635
Ending Balance	372	412	496
Financing Receivable, Allowance for Credit Loss, Writeoff	(290)	(486)	(425)
Recoveries	87	75	71
Provision for credit losses	163	327	215
Loans To Individuals [Member] | Other consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,987	2,320	3,077
Ending Balance	1,818	1,987	2,320
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,353)	(1,533)	(1,844)
Recoveries	300	487	373
Provision for credit losses	884	713	714
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	3
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Automobiles
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	3
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Consumer Credit Cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	0
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Other consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	0
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	21,412	12,625	14,358
Ending Balance	23,901	21,412	12,625
Financing Receivable, Allowance for Credit Loss, Writeoff	(561)	(339)	(309)
Recoveries	247	187	468
Provision for credit losses	2,276	8,939	(1,892)
Residential Real Estate [Member] | Senior Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	14,822	7,459	7,919
Ending Balance	16,975	14,822	7,459
Financing Receivable, Allowance for Credit Loss, Writeoff	(246)	(163)	(60)
Recoveries	177	130	337
Provision for credit losses	2,025	7,396	(737)
Residential Real Estate [Member] | Junior Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	6,590	5,166	6,439
Ending Balance	6,926	6,590	5,166
Financing Receivable, Allowance for Credit Loss, Writeoff	(315)	(176)	(249)
Recoveries	70	57	131
Provision for credit losses	251	$ 1,543	$ (1,155)
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	527
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Senior Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	197
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Junior Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	$ 330

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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