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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | $ 320,801 | $ 329,142
Distribution of variable rate loans by major loan category, Variable Rate | 205,101 | 192,753
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | 123,645 | 123,783
Distribution of variable rate loans by major loan category, Variable Rate | 98,913 | 100,008
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | 51,483 | 56,269
Distribution of variable rate loans by major loan category, Variable Rate | 91,426 | 76,291
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | 970,298 | 1,024,989
Distribution of variable rate loans by major loan category, Variable Rate | 333,300 | 312,777
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | 134,074 | 131,385
Distribution of variable rate loans by major loan category, Variable Rate | 134,352 | 123,550
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | 70,889 | 79,526
Distribution of variable rate loans by major loan category, Variable Rate | 29 | 65
Other Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Distribution of fixed rate loans by major loan category, Fixed Rate | 16,967 | 20,552
Distribution of variable rate loans by major loan category, Variable Rate | $ 9,482 | $ 9,584

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