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Loans - Contractual Aging at Amortized Cost in Past Due Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 2,581,940 $ 2,562,545
Total Financing Receivables 2,580,192 2,560,795
30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 4,272 3,769
60 to 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 52 712
Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,058 1,117
Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 6,382 5,598
Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,573,810 2,555,197
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 523,383 520,114
Total Financing Receivables 523,704 520,392
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,530 2,533
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 46 547
Consumer Real Estate [Member] | Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,293 559
Consumer Real Estate [Member] | Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,869 3,639
Consumer Real Estate [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 519,835 516,753
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 215,898 216,401
Total Financing Receivables 215,656 216,137
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 79 651
Agricultural Real Estate [Member] | Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 125  
Agricultural Real Estate [Member] | Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 204 651
Agricultural Real Estate [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 215,452 215,486
Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 153,607 152,080
Total Financing Receivables 153,921 152,381
Agricultural [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,436 44
Agricultural [Member] | Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 79 79
Agricultural [Member] | Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,515 123
Agricultural [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 152,406 152,258
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,325,698 1,310,811
Total Financing Receivables 1,323,262 1,308,461
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due   54
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 500 360
Commercial Real Estate [Member] | Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 500 555
Commercial Real Estate [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,322,762 1,307,906
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Financing Receivables 277,943 274,819
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 49 122
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 28 57
Commercial and Industrial [Member] | Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 77 184
Commercial and Industrial [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 277,866 274,635
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 60,115 63,009
Total Financing Receivables 60,721 63,627
Consumer [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 178 365
Consumer [Member] | 60 to 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 6 19
Consumer [Member] | Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 33 62
Consumer [Member] | Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 217 446
Consumer [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 60,504 63,181
Other Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 24,985 24,978
Total Financing Receivables 24,985 24,978
Other Loan [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 24,985 $ 24,978