Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 121,522	$ 105,680	$ 105,680
Charge-offs	(1,275)	(1,758)	(8,140)
Recoveries	132	170	1,527
Provision for (Benefit from) Credit Losses	4,015	4,315	22,455
Ending  Balance	124,394	108,407	121,522
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	5,850	4,315	4,315
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	290	(120)	1,535
Ending  Balance	6,140	4,195	5,850
Credit Loss [Roll Forward]
Beginning Balance	127,372	109,995	109,995
Charge-offs	(1,275)	(1,758)	(8,140)
Recoveries	132	170	1,527
Provision for (Benefit from) Credit Losses	4,305	4,195	23,990
Ending  Balance	130,534	112,602	127,372
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	68,864	61,381	61,381
Charge-offs	0	0	(3,637)
Recoveries	0	0	2
Provision for (Benefit from) Credit Losses	3,311	3,556	11,118
Ending  Balance	72,175	64,937	68,864
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	27,453	24,639	24,639
Charge-offs	(308)	(184)	(624)
Recoveries	89	116	1,175
Provision for (Benefit from) Credit Losses	207	325	2,263
Ending  Balance	27,441	24,896	27,453
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	12,750	13,597	13,597
Charge-offs	(130)	(1,574)	(3,879)
Recoveries	22	53	316
Provision for (Benefit from) Credit Losses	(775)	(7)	2,716
Ending  Balance	11,867	12,069	12,750
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,856	5,142	5,142
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	306	513	3,714
Ending  Balance	9,162	5,655	8,856
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,589	906	906
Charge-offs	(837)	0	0
Recoveries	21	1	34
Provision for (Benefit from) Credit Losses	935	(74)	2,649
Ending  Balance	3,708	833	3,589
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10	15	15
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	31	2	(5)
Ending  Balance	41	17	10
CRE non-owner occupied | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	35,077	30,962	30,962
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	1,610	2,001	4,115
Ending  Balance	36,687	32,963	35,077
CRE owner occupied | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	15,081	14,014	14,014
Charge-offs	0	0	(3,637)
Recoveries	0	0	2
Provision for (Benefit from) Credit Losses	1,030	545	4,702
Ending  Balance	16,111	14,559	15,081
Multifamily | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	14,418	13,132	13,132
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	1,264	741	1,286
Ending  Balance	15,682	13,873	14,418
Farmland | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,288	3,273	3,273
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	(593)	269	1,015
Ending  Balance	3,695	3,542	4,288
SFR 1-4 1st DT liens | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	14,009	11,268	11,268
Charge-offs	(26)	0	0
Recoveries	0	0	262
Provision for (Benefit from) Credit Losses	157	652	2,479
Ending  Balance	14,140	11,920	14,009
SFR HELOCs and junior liens | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,273	11,413	11,413
Charge-offs	(32)	(42)	(66)
Recoveries	49	65	723
Provision for (Benefit from) Credit Losses	(348)	(522)	(1,797)
Ending  Balance	9,942	10,914	10,273
Other | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,171	1,958	1,958
Charge-offs	(250)	(142)	(558)
Recoveries	40	51	190
Provision for (Benefit from) Credit Losses	398	195	1,581
Ending  Balance	$ 3,359	$ 2,062	$ 3,171