Loans and Allowance for Credit Losses - Schedule of Allowance for Loan Losses by Portfolio Segment Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	$ 52,756	$ 43,267
Provision for credit losses	5,955	2,722
Initial allowance on purchase credit deteriorated ("PCD") loan	3,620
Initial allowance on purchased seasoned loans	3,293
Loans charged-off	(2,081)	(1,139)
Recoveries	702	974
Allowance for Loan Losses, Ending Balance	64,245	45,824
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	20,037	14,948
Provision for credit losses	923	754
Initial allowance on purchase credit deteriorated ("PCD") loan	855
Initial allowance on purchased seasoned loans	1,108
Loans charged-off	(72)	(22)
Recoveries	31	442
Allowance for Loan Losses, Ending Balance	22,882	16,122
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	17,830	14,005
Provision for credit losses	4,467	(418)
Initial allowance on purchase credit deteriorated ("PCD") loan	1,962
Initial allowance on purchased seasoned loans	718
Loans charged-off	(1,700)	(443)
Recoveries	573	404
Allowance for Loan Losses, Ending Balance	23,850	13,548
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	8,068	8,553
Provision for credit losses	(613)	278
Initial allowance on purchase credit deteriorated ("PCD") loan	160
Initial allowance on purchased seasoned loans	114
Loans charged-off	(29)	(13)
Recoveries	1	9
Allowance for Loan Losses, Ending Balance	7,701	8,827
Agricultural Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	4,669	3,504
Provision for credit losses	1,326	1,606
Initial allowance on purchase credit deteriorated ("PCD") loan	440
Initial allowance on purchased seasoned loans	1,254
Loans charged-off	(36)	(6)
Recoveries	12	54
Allowance for Loan Losses, Ending Balance	7,665	5,158
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	337	439
Provision for credit losses	(261)	(67)
Initial allowance on purchase credit deteriorated ("PCD") loan	202
Initial allowance on purchased seasoned loans	12
Loans charged-off	(3)	(17)
Recoveries	4	1
Allowance for Loan Losses, Ending Balance	291	356
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	1,815	1,818
Provision for credit losses	113	569
Initial allowance on purchase credit deteriorated ("PCD") loan	1
Initial allowance on purchased seasoned loans	87
Loans charged-off	(241)	(638)
Recoveries	81	64
Allowance for Loan Losses, Ending Balance	$ 1,856	$ 1,813

Financing receivable initial allowance on purchased seasoned loans.

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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, excluding accrued interest, of increase in allowance for credit loss on financing receivable from purchase of loan. Excludes financing receivable purchased with credit deterioration, loan acquired through business combination or acquisition, and net investment in lease.

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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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