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Loans - Recorded Investment in Nonaccrual Loans by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Nonaccrual With No Allowance For Credit Loss [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | $ 2,392 | $ 22,169
Nonaccrual With No Allowance For Credit Loss [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 1,637 | 1,006
Nonaccrual With No Allowance For Credit Loss [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 130 | 15,949
Nonaccrual With No Allowance For Credit Loss [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 90 | 4,671
Nonaccrual With No Allowance For Credit Loss [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 360 | 254
Nonaccrual With No Allowance For Credit Loss [Member] | Commercial & Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 57 | 198
Nonaccrual With No Allowance For Credit Loss [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 118 | 91
Nonaccrual [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 3,124 | 22,353
Nonaccrual [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 2,369 | 1,190
Nonaccrual [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 130 | 15,949
Nonaccrual [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 90 | 4,671
Nonaccrual [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 360 | 254
Nonaccrual [Member] | Commercial & Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 57 | 198
Nonaccrual [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | $ 118 | $ 91

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