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Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross $ 298,012 $ 300,229    
Less undisbursed portion of loans in process (6,143) (7,142)    
Principal loan balance 291,869 293,087    
Deferred loan origination fees, net 366 341    
Allowance for loan losses (5,011) (4,922) (4,792) (4,736)
Loans, net 287,224 288,506    
Real Estate Portfolio Segment | Residential
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 106,252 107,029    
Real Estate Portfolio Segment | Land
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 10,082 10,309    
Real Estate Portfolio Segment | Residential Construction
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 14,729 14,423    
Real Estate Portfolio Segment | Commercial Real Estate
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 77,764 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 21,201 21,956    
Principal loan balance 21,201 21,956    
Deferred loan origination fees, net (9) (9)    
Allowance for loan losses (1,450) (1,446) (1,226) (1,223)
Other Consumer
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal loan balance 32,424 33,486    
Deferred loan origination fees, net 0 0    
Allowance for loan losses (331) (289) (330) (291)
Other Consumer | Home Equity and Second Mortgage
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 34,482 34,815    
Other Consumer | Automobile Loan
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 23,630 23,983    
Other Consumer | Loans Secured by Savings Accounts
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 1,041 1,138    
Other Consumer | Unsecured Loan
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross 3,413 3,541    
Other Consumer | Other Consumer Loan
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, gross $ 4,340 $ 4,824