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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
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-Paragraph 7
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 5,405,718		$ 4,198,180
Allowance for credit losses	(64,413)	$ (64,245)	(52,756)	$ (45,270)	$ (45,824)	$ (43,267)
Net loans	5,341,305		4,145,424
Commercial Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,968,281		2,226,348
Allowance for credit losses	(23,667)	(22,882)	(20,037)	(16,250)	(16,122)	(14,948)
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	955,380		816,885
Allowance for credit losses	(23,325)	(23,850)	(17,830)	(13,237)	(13,548)	(14,005)
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	710,948		582,145
Allowance for credit losses	(7,482)	(7,701)	(8,068)	(8,542)	(8,827)	(8,553)
Agricultural Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	419,830		278,927
Allowance for credit losses	(7,587)	(7,665)	(4,669)	(5,132)	(5,158)	(3,504)
Agricultural [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	247,327		188,475
Allowance for credit losses	(609)	(291)	(337)	(268)	(356)	(439)
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	103,952		105,400
Allowance for credit losses	$ (1,743)	$ (1,856)	$ (1,815)	$ (1,841)	$ (1,813)	$ (1,818)