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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, 2017
Dec. 31, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 790,838 $ 758,094 $ 729,915
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 83,903 85,873 $ 88,165
Pass [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 83,589 85,322  
5 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs   25  
6 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 229 368  
7 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 85 158  
Consumer - Credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,797 4,061  
Consumer - Credit [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,797 4,061  
Consumer - Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 31,638 29,152  
Consumer - Other [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 31,621 29,120  
Consumer - Other [Member] | Nonperforming [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net $ 17 $ 32