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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
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