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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