Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for Periods Indicated (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 127,939	$ 128,423	$ 125,762	$ 125,366	$ 125,366
Charge-offs	(455)	(8,595)	(1,367)	(8,969)	(11,051)
Recoveries	118	102	237	870	1,129
Provision (benefit)	2,585	4,525	5,555	7,188	10,318
Ending balance	130,187	124,455	130,187	124,455	125,762
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	8,100	7,065	7,745	6,000	6,000
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for (benefit from) credit losses	70	140	425	1,205	1,745
Ending balance	8,170	7,205	8,170	7,205	7,745
Credit Loss [Roll Forward]
Beginning balance	136,039	135,488	133,507	131,366	131,366
Charge-offs	(455)	(8,595)	(1,367)	(8,969)	(11,051)
Recoveries	118	102	237	870	1,129
Provision for (benefit from) credit losses	2,655	4,665	5,980	8,393	12,063
Ending balance	138,357	131,660	138,357	131,660	133,507
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	79,910	72,180	75,532	72,849	72,849
Charge-offs	0	0	0	0	(1,053)
Recoveries	1	1	2	1	3
Provision (benefit)	(251)	2,303	4,126	1,634	3,733
Ending balance	79,660	74,484	79,660	74,484	75,532
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	23,786	25,540	26,283	27,463	27,463
Charge-offs	(308)	(200)	(529)	(317)	(649)
Recoveries	91	40	150	89	170
Provision (benefit)	1,400	(62)	(935)	(1,917)	(701)
Ending balance	24,969	25,318	24,969	25,318	26,283
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,435	17,561	11,430	14,397	14,397
Charge-offs	(147)	(8,384)	(768)	(8,641)	(9,338)
Recoveries	26	60	74	166	291
Provision (benefit)	1,173	787	2,751	4,102	6,080
Ending balance	13,487	10,024	13,487	10,024	11,430
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,239	10,346	8,231	7,224	7,224
Charge-offs	0	0	(70)	0	0
Recoveries	0	0	0	0	0
Provision (benefit)	212	649	290	3,771	1,007
Ending balance	8,451	10,995	8,451	10,995	8,231
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,548	2,768	4,265	3,403	3,403
Charge-offs	0	(11)	0	(11)	(11)
Recoveries	0	1	11	614	665
Provision (benefit)	54	851	(674)	(397)	208
Ending balance	3,602	3,609	3,602	3,609	4,265
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	21	28	21	30	30
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (benefit)	(3)	(3)	(3)	(5)	(9)
Ending balance	18	25	18	25	21
CRE non-owner occupied \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	41,647	39,670	40,300	37,229	37,229
Charge-offs	0	0	0	0	0
Recoveries	0	0	1	0	2
Provision (benefit)	536	1,251	1,882	3,692	3,069
Ending balance	42,183	40,921	42,183	40,921	40,300
CRE owner occupied \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,286	12,169	12,712	15,747	15,747
Charge-offs	0	0	0	0	0
Recoveries	1	1	1	1	1
Provision (benefit)	(239)	(592)	3,335	(4,170)	(3,036)
Ending balance	16,048	11,578	16,048	11,578	12,712
Multifamily \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,384	15,604	17,327	15,913	15,913
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (benefit)	304	(507)	(639)	(816)	1,414
Ending balance	16,688	15,097	16,688	15,097	17,327
Farmland \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,593	4,737	5,193	3,960	3,960
Charge-offs	0	0	0	0	(1,053)
Recoveries	0	0	0	0	0
Provision (benefit)	(852)	2,151	(452)	2,928	2,286
Ending balance	4,741	6,888	4,741	6,888	5,193
SFR 1-4 1st DT liens \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,929	10,995	11,045	14,227	14,227
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	6
Provision (benefit)	522	140	(594)	(3,092)	(3,188)
Ending balance	10,451	11,135	10,451	11,135	11,045
SFR HELOCs and junior liens \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,297	11,650	13,264	10,411	10,411
Charge-offs	(75)	0	(75)	0	0
Recoveries	42	4	49	16	26
Provision (benefit)	608	367	(366)	1,594	2,827
Ending balance	12,872	12,021	12,872	12,021	13,264
Other \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,560	2,895	1,974	2,825	2,825
Charge-offs	(233)	(200)	(454)	(317)	(649)
Recoveries	49	36	101	73	138
Provision (benefit)	270	(569)	25	(419)	(340)
Ending balance	$ 1,646	$ 2,162	$ 1,646	$ 2,162	$ 1,974

Credit Loss, Allowance For Credit Loss

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Credit Loss, Allowance For Credit Loss, Recovery

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Credit Loss, Allowance For Credit Loss, Writeoff

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Credit Loss, Expense (Reversal)

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Off Balance Sheet, Credit Loss, Recovery

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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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 of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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