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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 4,163 $ 1,139  
Current 1,243,478 1,217,860  
Loans after net deferred loan fees and costs 1,247,641 1,218,999 $ 1,098,465
Recorded Investment > 90 Days and Accruing 0 0 0
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 3,848 688  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 315 451  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 846 425  
Current 173,130 164,266  
Loans after net deferred loan fees and costs 173,976 164,691 160,276
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 842 355  
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 4 70  
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 505 107  
Current 193,625 198,752  
Loans after net deferred loan fees and costs 194,130 198,859 191,736
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 505    
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   107  
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,403 85  
Current 108,304 111,864  
Loans after net deferred loan fees and costs 109,707 111,949 113,021
Agricultural [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,403 78  
Agricultural [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   7  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 186    
Current 568,805 550,082  
Loans after net deferred loan fees and costs 568,991 550,082 440,281
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 186    
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,121 468  
Current 150,526 143,541  
Loans after net deferred loan fees and costs 151,647 144,009 145,381
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 823 201  
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 298 267  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 102 54  
Current 49,088 49,355  
Loans after net deferred loan fees and costs 49,190 49,409 $ 47,770
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 89 $ 54  
Consumer [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 13