Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 91,847	$ 30,616	$ 32,582
Charge-offs	(2,392)	(1,755)	(3,639)
Recoveries	3,086	1,885	3,363
Provision for (Benefit from) Credit Losses	(7,165)	42,188	(1,690)
Ending  Balance	85,376	91,847	30,616
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	3,400	2,775
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	390	625
Ending  Balance	3,790	3,400	2,775
Credit Loss [Roll Forward]
Beginning Balance	95,247	33,391
Charge-offs	(2,392)	(1,755)
Recoveries	3,086	1,885
Provision for (Benefit from) Credit Losses	(6,775)	42,813
Ending  Balance	89,166	95,247	33,391
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	18,913
Ending  Balance		18,913
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	0
Ending  Balance		0
Credit Loss [Roll Forward]
Beginning Balance	18,913
Ending  Balance		18,913
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	53,693	11,995	12,944
Charge-offs	(144)	(182)	(746)
Recoveries	806	226	1,528
Provision for (Benefit from) Credit Losses	(3,215)	29,806	(1,731)
Ending  Balance	51,140	53,693	11,995
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,848
Ending  Balance		11,848
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	25,148	10,084	11,051
Charge-offs	(751)	(799)	(770)
Recoveries	1,501	1,067	1,310
Provision for (Benefit from) Credit Losses	(2,424)	6,512	(1,507)
Ending  Balance	23,474	25,148	10,084
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,284
Ending  Balance		8,284
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,252	4,867	5,610
Charge-offs	(1,470)	(774)	(2,104)
Recoveries	755	568	513
Provision for (Benefit from) Credit Losses	325	1,552	848
Ending  Balance	3,862	4,252	4,867
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	(1,961)
Ending  Balance		(1,961)
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,540	3,388	2,497
Charge-offs	(27)	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	(1,846)	3,219	891
Ending  Balance	5,667	7,540	3,388
Construction | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	933
Ending  Balance		933
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,209	261	480
Charge-offs	0	0	(19)
Recoveries	24	24	12
Provision for (Benefit from) Credit Losses	(18)	1,103	(212)
Ending  Balance	1,215	1,209	261
Agriculture production | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	(179)
Ending  Balance		(179)
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5	21	0
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	13	(4)	21
Ending  Balance	18	5	21
Leases | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	(12)
Ending  Balance		(12)
Mortgage Loans on Real Estate | Commercial loans
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			2,575
Provision for (Benefit from) Credit Losses			200
CRE non-owner occupied | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	29,380	5,948	7,401
Charge-offs	0	0	0
Recoveries	12	198	1,486
Provision for (Benefit from) Credit Losses	(3,653)	16,533	(2,939)
Ending  Balance	25,739	29,380	5,948
CRE non-owner occupied | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	6,701
Ending  Balance		6,701
CRE owner occupied | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,861	2,027	2,711
Charge-offs	(18)	0	(746)
Recoveries	794	28	42
Provision for (Benefit from) Credit Losses	(946)	6,525	20
Ending  Balance	10,691	10,861	2,027
CRE owner occupied | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,281
Ending  Balance		2,281
Multifamily | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,472	3,352	2,429
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	923	5,839	923
Ending  Balance	12,395	11,472	3,352
Multifamily | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,281
Ending  Balance		2,281
Farmland | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,980	668	403
Charge-offs	(126)	(182)	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	461	909	265
Ending  Balance	2,315	1,980	668
Farmland | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	585
Ending  Balance		585
SFR 1-4 1st DT liens | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,117	2,306	2,676
Charge-offs	(145)	(13)	(2)
Recoveries	13	416	54
Provision for (Benefit from) Credit Losses	738	4,733	(422)
Ending  Balance	10,723	10,117	2,306
SFR 1-4 1st DT liens | Consumer | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,675
Ending  Balance		2,675
SFR HELOCs and junior liens | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,771	6,183	7,582
Charge-offs	(29)	(116)	(3)
Recoveries	1,127	304	935
Provision for (Benefit from) Credit Losses	(2,359)	762	(2,331)
Ending  Balance	10,510	11,771	6,183
SFR HELOCs and junior liens | Consumer | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,638
Ending  Balance		4,638
Other | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,260	1,595	793
Charge-offs	(577)	(670)	(765)
Recoveries	361	347	321
Provision for (Benefit from) Credit Losses	(803)	1,017	1,246
Ending  Balance	2,241	3,260	$ 1,595
Other | Consumer | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 971
Ending  Balance		$ 971