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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, 2020
Dec. 31, 2019
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 3,562 $ 1,139  
Current 1,341,161 1,217,860  
Loans after net deferred loan fees and costs 1,344,723 1,218,999 $ 1,091,131
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 2,587 688  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 975 451  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 2,179 425  
Current 171,436 164,266  
Loans after net deferred loan fees and costs 173,615 164,691 158,957
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,204 355  
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 975 70  
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 652 107  
Current 193,658 198,752  
Loans after net deferred loan fees and costs 194,310 198,859 193,616
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 652    
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 631 85  
Current 106,984 111,864  
Loans after net deferred loan fees and costs 107,615 111,949 113,906
Agricultural [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 631 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]      
Current 588,176 550,082  
Loans after net deferred loan fees and costs 588,176 550,082 442,538
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 23 468  
Current 230,725 143,541  
Loans after net deferred loan fees and costs 230,748 144,009 133,014
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 23 201  
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   267  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 77 54  
Current 50,182 49,355  
Loans after net deferred loan fees and costs 50,259 49,409 $ 49,100
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 77 $ 54