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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 2,529,606 $ 2,356,387 $ 2,142,616
Recorded Investment > 90 Days and Accruing   0 0
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 4,026 3,197  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 2,129 674  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 3,047 2,154  
Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 9,202 6,025  
Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 2,520,404 2,350,362  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 512,990    
Loans after net deferred loan fees and costs 512,990 494,423 416,044
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 2,116 1,536  
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 559 635  
Consumer Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 346 90  
Consumer Real Estate [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 3,021 2,261  
Consumer Real Estate [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 509,969 492,162  
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 225,370 220,514 204,787
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,227 118  
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   2  
Agricultural Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 60 1,550  
Agricultural Real Estate [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,287 1,670  
Agricultural Real Estate [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 224,083 218,844  
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 123,971    
Loans after net deferred loan fees and costs 123,971 128,926 128,818
Agricultural [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 60 433  
Agricultural [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,498    
Agricultural [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,524 152  
Agricultural [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 3,082 585  
Agricultural [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 120,889 128,341  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,301,614    
Loans after net deferred loan fees and costs 1,301,614 1,150,511 1,061,904
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 503 74  
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 5    
Commercial Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 255 180  
Commercial Real Estate [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 763 254  
Commercial Real Estate [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,300,851 1,150,257  
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 281,839 272,119 260,000
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 16 953  
Commercial and Industrial [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 855 182  
Commercial and Industrial [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 871 1,135  
Commercial and Industrial [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 280,968 270,984  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 83,822 89,894 $ 71,063
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 104 83  
Consumer [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 67 37  
Consumer [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 7    
Consumer [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 178 120  
Consumer [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 83,644 $ 89,774