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Loans - Recorded Investment for Consumer Loans, Credit Quality based on Status of Loan and Payment Activity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 707,660 $ 685,878 $ 614,709
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 88,097 87,947 $ 97,019
Pass [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 87,257 87,292  
5 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs   48  
6 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 330 332  
7 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 510 275  
Consumer - Credit Card [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,587 3,901  
Consumer - Credit Card [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,587 3,901  
Consumer - Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 24,429 23,886  
Consumer - Other [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 24,408 23,863  
Consumer - Other [Member] | Nonperforming [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net $ 21 $ 23