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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, 2017
Dec. 31, 2016
Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs $ 771,206 $ 758,094 $ 707,660
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 84,081 85,873 $ 88,097
Pass [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 83,560 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 25  
6 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 338 368  
7 [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans after net deferred loan fees and costs 158 158  
Consumer - Credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,762 4,061  
Consumer - Credit [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 3,762 4,061  
Consumer - Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 30,116 29,152  
Consumer - Other [Member] | Performing [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net 30,094 29,120  
Consumer - Other [Member] | Nonperforming [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Net $ 22 $ 32