Loans and Allowance for Credit Losses - Schedule of Allowance for Loan Losses by Portfolio Segment Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	$ 43,267	$ 43,520	$ 45,847
Provision (reversal) for credit losses	8,953	2,546	1,873
Initial PCD on Acquired loans	3,076	1,000
Loans charged-off	(4,990)	(4,616)	(4,954)
Recoveries	2,450	817	754
Allowance for Loan Losses, Ending Balance	52,756	43,267	43,520
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	14,948	13,476	16,731
Provision (reversal) for credit losses	3,092	1,525	(3,330)
Initial PCD on Acquired loans	1,857
Loans charged-off	(953)	(97)	(20)
Recoveries	1,093	44	95
Allowance for Loan Losses, Ending Balance	20,037	14,948	13,476
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	14,005	17,954	14,951
Provision (reversal) for credit losses	4,946	(1,290)	6,703
Initial PCD on Acquired loans	212	128
Loans charged-off	(2,088)	(3,185)	(3,791)
Recoveries	755	398	91
Allowance for Loan Losses, Ending Balance	17,830	14,005	17,954
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	8,553	7,784	8,608
Provision (reversal) for credit losses	(521)	681	(806)
Initial PCD on Acquired loans	25	227
Loans charged-off	(149)	(183)	(80)
Recoveries	160	44	62
Allowance for Loan Losses, Ending Balance	8,068	8,553	7,784
Agricultural Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	3,504	1,718	819
Provision (reversal) for credit losses	722	1,464	945
Initial PCD on Acquired loans	408	330
Loans charged-off	(58)	(100)	(54)
Recoveries	93	92	8
Allowance for Loan Losses, Ending Balance	4,669	3,504	1,718
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	439	995	2,457
Provision (reversal) for credit losses	(606)	(859)	(1,509)
Initial PCD on Acquired loans	574	306
Loans charged-off	(131)	(28)	(108)
Recoveries	61	25	155
Allowance for Loan Losses, Ending Balance	337	439	995
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	1,818	1,593	2,281
Provision (reversal) for credit losses	1,320	1,025	(130)
Initial PCD on Acquired loans	0	9
Loans charged-off	(1,611)	(1,023)	(901)
Recoveries	288	214	343
Allowance for Loan Losses, Ending Balance	$ 1,815	$ 1,818	$ 1,593

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

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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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