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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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