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Loans - Schedule of Collateral-dependent Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 18,849	$ 22,676
Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	1,949	1,518
Agricultural Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	12,003	15,888
Agricultural Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	4,312	4,998
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	539	255
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 46	$ 17

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Paragraph 79
-Publisher FASB
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