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Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Receivables [Line Items]            
Loans, gross $ 299,877   $ 289,247      
Deferred loan origination fees, net 297   202      
Undisbursed portion of loans in process (6,333)   (4,306)      
Allowance for loan losses (4,904) (4,835) (4,736) (4,591) (4,432) (4,182)
Loans, net 288,937   280,407      
Real Estate Portfolio Segment | Residential
           
Receivables [Line Items]            
Loans, gross 108,317   108,097      
Real Estate Portfolio Segment | Land
           
Receivables [Line Items]            
Loans, gross 10,090   9,607      
Real Estate Portfolio Segment | Residential Construction
           
Receivables [Line Items]            
Loans, gross 15,089   12,753      
Real Estate Portfolio Segment | Commercial Real Estate
           
Receivables [Line Items]            
Loans, gross 77,820   68,731      
Real Estate Portfolio Segment | Real Estate Construction
           
Receivables [Line Items]            
Loans, gross 978   3,299      
Commercial Business
           
Receivables [Line Items]            
Loans, gross 20,049   18,612      
Deferred loan origination fees, net (9)   (10)      
Allowance for loan losses (1,474) (1,260) (1,223) (1,099) (1,154) (1,160)
Other Consumer
           
Receivables [Line Items]            
Deferred loan origination fees, net 0   0      
Allowance for loan losses (310) (352) (291) (306) (297) (399)
Other Consumer | Home Equity and Second Mortgage
           
Receivables [Line Items]            
Loans, gross 34,614   36,962      
Other Consumer | Automobile Loan
           
Receivables [Line Items]            
Loans, gross 23,572   21,922      
Other Consumer | Loans Secured by Savings Accounts
           
Receivables [Line Items]            
Loans, gross 1,259   770      
Other Consumer | Unsecured Loan
           
Receivables [Line Items]            
Loans, gross 3,150   3,191      
Other Consumer | Other Consumer Loan
           
Receivables [Line Items]            
Loans, gross $ 4,939   $ 5,303