Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 5,428,275	$ 4,198,180
Allowance for credit losses	(64,245)	(52,756)	$ (45,824)	$ (43,267)
Net loans	5,364,030	4,145,424
Commercial Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,958,263	2,226,348
Allowance for credit losses	(22,882)	(20,037)	(16,122)	(14,948)
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	967,049	816,885
Allowance for credit losses	(23,850)	(17,830)	(13,548)	(14,005)
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	720,441	582,145
Allowance for credit losses	(7,701)	(8,068)	(8,827)	(8,553)
Agricultural Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	431,308	278,927
Allowance for credit losses	(7,665)	(4,669)	(5,158)	(3,504)
Agricultural [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	249,053	188,475
Allowance for credit losses	(291)	(337)	(356)	(439)
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	102,161	105,400
Allowance for credit losses	$ (1,856)	$ (1,815)	$ (1,813)	$ (1,818)

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
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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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
-Topic 326
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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