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Loans - Schedule of Collateral-dependent Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 2,766	$ 22,676
Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	2,204	1,518
Agricultural Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	125	15,888
Agricultural Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	50	4,998
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	359	255
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral dependent loans	$ 28	$ 17

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