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Loans - Schedule of Collateral-dependent Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 2,776	$ 22,676
Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	2,191	1,518
Agricultural Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans		15,888
Agricultural Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans		4,998
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	540	255
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 45	$ 17

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