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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 2,560,760 | $ 2,580,674
Total Financing Receivables | 2,559,126 | 2,578,472
30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,491 | 2,657
60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 549 | 4,735
Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,218 | 4,182
Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 5,258 | 11,574
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,553,868 | 2,566,898
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 525,902 | 521,895
Total Financing Receivables | 526,054 | 521,908
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,824 | 1,914
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 288 | 137
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 492 | 670
Consumer Real Estate [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,604 | 2,721
Consumer Real Estate [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 522,450 | 519,187
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 222,558 | 223,791
Total Financing Receivables | 222,280 | 223,479
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 5 |
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 | 55
Agricultural Real Estate [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 60 | 3,484
Agricultural Real Estate [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 222,220 | 219,995
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 142,909 | 132,560
Total Financing Receivables | 143,257 | 132,763
Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 352 |
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 | 42 | 2,977
Agricultural [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 394 | 4,109
Agricultural [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 142,863 | 128,654
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,303,598 | 1,337,766
Total Financing Receivables | 1,301,256 | 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 | 112 | 380
Commercial Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 555 | 255
Commercial Real Estate [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 667 | 635
Commercial Real Estate [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,300,589 | 1,334,440
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Financing Receivables | 294,676 | 284,894
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 47 | 145
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 184 |
Commercial and Industrial [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 17 | 199
Commercial and Industrial [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 248 | 344
Commercial and Industrial [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 294,428 | 284,550
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 70,918 | 79,591
Total Financing Receivables | 71,603 | 80,353
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 151 | 218
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 77 | 37
Consumer [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 57 | 26
Consumer [Member] | Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 285 | 281
Consumer [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 71,318 | $ 80,072

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