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Loans - Recorded Investment for Consumer Loans, Credit Quality based on Status of Loan and Payment Activity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 831,015 $ 823,024 $ 790,838
Consumer - Credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 3,998 4,108  
Consumer - Credit [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 3,998 4,108  
Consumer - Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 36,597 33,694  
Consumer - Other [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 36,579 33,666  
Consumer - Other [Member] | Nonperforming [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 18 28  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 82,368 83,200 $ 83,903
Pass [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 81,834 82,632  
6 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 454 488  
7 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 80 $ 80