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Loans - Schedule of Collateral-dependent Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 4,113	$ 2,988
Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	3,123	2,384
Agricultural Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	371	125
Agricultural Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	50	50
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	500	360
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	28	28
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 41	$ 41

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