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Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross $ 308,010   $ 300,229      
Less undisbursed portion of loans in process (5,359)   (7,142)      
Principal loan balance 302,651   293,087      
Deferred loan origination fees, net 412   341      
Allowance for loan losses (5,066) (5,011) (4,922) (4,835) (4,792) (4,736)
Loans, net 297,997   288,506      
Real Estate Portfolio Segment | Residential
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 105,377   107,029      
Real Estate Portfolio Segment | Land
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 9,938   10,309      
Real Estate Portfolio Segment | Residential Construction
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 13,274   14,423      
Real Estate Portfolio Segment | Commercial Real Estate
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 78,547   76,496      
Real Estate Portfolio Segment | Real Estate Construction
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 1,078   1,715      
Commercial Business
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 28,354   21,956      
Principal loan balance 28,354   21,956      
Deferred loan origination fees, net (9)   (9)      
Allowance for loan losses (1,444) (1,450) (1,446) (1,260) (1,226) (1,223)
Other Consumer
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal loan balance 34,609   33,486      
Deferred loan origination fees, net 0   0      
Allowance for loan losses (336) (331) (289) (352) (330) (291)
Other Consumer | Home Equity and Second Mortgage
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 36,833   34,815      
Other Consumer | Automobile Loan
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 24,948   23,983      
Other Consumer | Loans Secured by Savings Accounts
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 994   1,138      
Other Consumer | Unsecured Loan
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross 3,706   3,541      
Other Consumer | Other Consumer Loan
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, gross $ 4,961   $ 4,824