Loans and Allowance for Credit Losses - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	$ 6,549	$ 4,887
Collectively evaluated for credit losses	46,207	38,380
Total Allowance for Loan Losses	52,756	43,267	$ 43,520	$ 45,847
Individually evaluated for credit losses	52,324	29,893
Collectively evaluated for credit losses	4,145,856	3,470,923
Total Loans	4,198,180	3,500,816
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	2,599	1,053
Collectively evaluated for credit losses	17,438	13,895
Total Allowance for Loan Losses	20,037	14,948	13,476	16,731
Individually evaluated for credit losses	18,171	7,854
Collectively evaluated for credit losses	2,208,177	1,822,660
Total Loans	2,226,348	1,830,514
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	2,341	1,618
Collectively evaluated for credit losses	15,489	12,387
Total Allowance for Loan Losses	17,830	14,005	17,954	14,951
Individually evaluated for credit losses	21,905	8,593
Collectively evaluated for credit losses	794,980	650,272
Total Loans	816,885	658,865
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	910	1,167
Collectively evaluated for credit losses	7,158	7,386
Total Allowance for Loan Losses	8,068	8,553	7,784	8,608
Individually evaluated for credit losses	4,664	4,996
Collectively evaluated for credit losses	577,481	561,770
Total Loans	582,145	566,766
Agricultural Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	342	701
Collectively evaluated for credit losses	4,327	2,803
Total Allowance for Loan Losses	4,669	3,504	1,718	819
Individually evaluated for credit losses	2,886	5,839
Collectively evaluated for credit losses	276,041	261,409
Total Loans	278,927	267,248
Agricultural [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	186	147
Collectively evaluated for credit losses	151	292
Total Allowance for Loan Losses	337	439	995	2,457
Individually evaluated for credit losses	3,928	1,740
Collectively evaluated for credit losses	184,547	85,599
Total Loans	188,475	87,339
Consumer [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	171	201
Collectively evaluated for credit losses	1,644	1,617
Total Allowance for Loan Losses	1,815	1,818	$ 1,593	$ 2,281
Individually evaluated for credit losses	770	871
Collectively evaluated for credit losses	104,630	89,213
Total Loans	$ 105,400	$ 90,084

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

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