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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, 2016
Dec. 31, 2015
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 738,682 $ 685,878 $ 635,239
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 86,898 87,947 $ 88,020
Pass [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 86,423 87,292  
5 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 10 48  
6 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 136 332  
7 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 329 275  
Consumer - Credit Card [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,726 3,901  
Consumer - Credit Card [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,726 3,901  
Consumer - Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 26,890 23,886  
Consumer - Other [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 26,870 23,863  
Consumer - Other [Member] | Nonperforming [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net $ 20 $ 23