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Loans - Recorded Investment for Consumer Loans, Credit Quality based on Status of Loan and Payment Activity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 838,698 $ 823,024 $ 795,205
Consumer - Credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 3,800 4,108  
Consumer - Credit [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 3,800 4,108  
Consumer - Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 37,741 33,694  
Consumer - Other [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 37,720 33,666  
Consumer - Other [Member] | Nonperforming [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing 21 28  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 82,629 83,200 $ 83,875
Pass [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 82,175 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