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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 2,562,545 | $ 2,580,674
Total Financing Receivables | 2,560,795 | 2,578,472
30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,769 | 2,657
60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 712 | 4,735
Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,117 | 4,182
Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 5,598 | 11,574
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,555,197 | 2,566,898
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 520,114 | 521,895
Total Financing Receivables | 520,392 | 521,908
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,533 | 1,914
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 547 | 137
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 559 | 670
Consumer Real Estate [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,639 | 2,721
Consumer Real Estate [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 516,753 | 519,187
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 216,401 | 223,791
Total Financing Receivables | 216,137 | 223,479
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 651 |
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 3,429
Agricultural Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 55
Agricultural Real Estate [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 651 | 3,484
Agricultural Real Estate [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 215,486 | 219,995
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 152,080 | 132,560
Total Financing Receivables | 152,381 | 132,763
Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 44 |
Agricultural [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 1,132
Agricultural [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 79 | 2,977
Agricultural [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 123 | 4,109
Agricultural [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 152,258 | 128,654
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,310,811 | 1,337,766
Total Financing Receivables | 1,308,461 | 1,335,075
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 54 | 380
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 141 |
Commercial Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 360 | 255
Commercial Real Estate [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 555 | 635
Commercial Real Estate [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,307,906 | 1,334,440
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Financing Receivables | 299,797 | 284,894
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 122 | 145
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 5 |
Commercial and Industrial [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 57 | 199
Commercial and Industrial [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 184 | 344
Commercial and Industrial [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 299,613 | 284,550
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 63,009 | 79,591
Total Financing Receivables | 63,627 | 80,353
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 365 | 218
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 19 | 37
Consumer [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 62 |
Consumer [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 446 | 281
Consumer [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 63,181 | $ 80,072

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