Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 4,198,180	$ 3,500,816
Allowance for credit losses	(52,756)	(43,267)	$ (43,520)	$ (45,847)
Net loans	4,145,424	3,457,549
Commercial Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,226,348	1,830,514
Allowance for credit losses	(20,037)	(14,948)	(13,476)	(16,731)
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	816,885	658,865
Allowance for credit losses	(17,830)	(14,005)	(17,954)	(14,951)
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	582,145	566,766
Allowance for credit losses	(8,068)	(8,553)	(7,784)	(8,608)
Agricultural Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	278,927	267,248
Allowance for credit losses	(4,669)	(3,504)	(1,718)	(819)
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	105,400	90,084
Allowance for credit losses	(1,815)	(1,818)	(1,593)	(2,281)
Agricultural [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	188,475	87,339
Allowance for credit losses	$ (337)	$ (439)	$ (995)	$ (2,457)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
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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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