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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | $ 2,578,472 | $ 2,356,387
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 223,479 | 220,514
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 132,763 | 128,926
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | $ 1,335,075 | 1,150,511
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 242,301
Other Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 29,818
1-2 [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 9,912
1-2 [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 5,857
1-2 [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 8,718
1-2 [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 780
3 [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 47,405
3 [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 33,671
3 [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 370,035
3 [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 67,506
3 [Member] | Other Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 10,921
4 [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 146,143
4 [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 88,992
4 [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 737,745
4 [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 167,291
4 [Member] | Other Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 18,897
5 [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 10,389
5 [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 228
5 [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 9,751
5 [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 3,592
6 [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 6,665
6 [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 178
6 [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | 24,262
6 [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs |  | $ 3,132

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