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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 1,139 $ 737
Current 1,217,860 845,637
Loans after net deferred loan fees and costs 1,218,999 846,374
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 688 427
60 to 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 451 48
Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due   262
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 425 620
Current 164,266 79,612
Loans after net deferred loan fees and costs 164,691 80,232
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 355 342
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 70 24
Consumer Real Estate [Member] | Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due   254
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 107  
Current 198,752 68,588
Loans after net deferred loan fees and costs 198,859 68,588
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 85  
Current 111,864 108,616
Loans after net deferred loan fees and costs 111,949 108,616
Agricultural [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 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 550,082 419,131
Loans after net deferred loan fees and costs 550,082 419,131
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 468  
Current 143,541 127,752
Loans after net deferred loan fees and costs 144,009 127,752
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 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 54 117
Current 49,355 41,938
Loans after net deferred loan fees and costs 49,409 42,055
Consumer [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 54 85
Consumer [Member] | 60 to 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due   24
Consumer [Member] | Greater Than 90 Days [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due   $ 8