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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 1,495,562 $ 1,302,990 $ 1,363,862
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 493 322  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 244 941  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 867 2,464  
Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,604 3,727  
Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,493,958 1,299,263  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 202,370 175,316 175,595
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 175 269  
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   191  
Consumer Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 204 1,032  
Consumer Real Estate [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 379 1,492  
Consumer Real Estate [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 201,991 173,824  
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 179,051 188,826 192,577
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 120    
Agricultural Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   88  
Agricultural Real Estate [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 120 88  
Agricultural Real Estate [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 178,931 188,738  
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 105,722 94,490 103,476
Agricultural [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 117 176  
Agricultural [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 117 176  
Agricultural [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 105,605 94,314  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 727,418 587,654 593,936
Commercial Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 180 185  
Commercial Real Estate [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 180 185  
Commercial Real Estate [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 727,238 587,469  
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 225,382 204,043 244,823
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 136    
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 199 750  
Commercial and Industrial [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 366 983  
Commercial and Industrial [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 701 1,733  
Commercial and Industrial [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 224,681 202,310  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 55,619 52,661 $ 53,455
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 62 53  
Consumer [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 45    
Consumer [Member] | Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 107 53  
Consumer [Member] | Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 55,512 $ 52,608