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Loans and Allowance for Credit Losses - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	$ 10,308		$ 6,549
Collectively evaluated for credit losses	54,105		46,207
Total Allowance for Loan Losses	64,413	$ 64,245	52,756	$ 45,270	$ 45,824	$ 43,267
Individually evaluated for credit losses	85,581		52,324
Collectively evaluated for credit losses	5,320,137		4,145,856
Total Loans	5,405,718		4,198,180
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	4,020		2,599
Collectively evaluated for credit losses	19,647		17,438
Total Allowance for Loan Losses	23,667	22,882	20,037	16,250	16,122	14,948
Individually evaluated for credit losses	36,012		18,171
Collectively evaluated for credit losses	2,932,269		2,208,177
Total Loans	2,968,281		2,226,348
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	4,451		2,341
Collectively evaluated for credit losses	18,874		15,489
Total Allowance for Loan Losses	23,325	23,850	17,830	13,237	13,548	14,005
Individually evaluated for credit losses	33,386		21,905
Collectively evaluated for credit losses	921,994		794,980
Total Loans	955,380		816,885
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	949		910
Collectively evaluated for credit losses	6,533		7,158
Total Allowance for Loan Losses	7,482	7,701	8,068	8,542	8,827	8,553
Individually evaluated for credit losses	6,072		4,664
Collectively evaluated for credit losses	704,876		577,481
Total Loans	710,948		582,145
Agricultural Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	498		342
Collectively evaluated for credit losses	7,089		4,327
Total Allowance for Loan Losses	7,587	7,665	4,669	5,132	5,158	3,504
Individually evaluated for credit losses	5,892		2,886
Collectively evaluated for credit losses	413,938		276,041
Total Loans	419,830		278,927
Agricultural [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	212		186
Collectively evaluated for credit losses	397		151
Total Allowance for Loan Losses	609	291	337	268	356	439
Individually evaluated for credit losses	3,477		3,928
Collectively evaluated for credit losses	243,850		184,547
Total Loans	247,327		188,475
Consumer [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for credit losses	178		171
Collectively evaluated for credit losses	1,565		1,644
Total Allowance for Loan Losses	1,743	$ 1,856	1,815	$ 1,841	$ 1,813	$ 1,818
Individually evaluated for credit losses	742		770
Collectively evaluated for credit losses	103,210		104,630
Total Loans	$ 103,952		$ 105,400