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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, gross $ 286,236,000 $ 281,356,000
Loans purchased for related party 9,174,000  
Loans, related party 6,084,000 5,627,000
Increase in allowance for loan losses due to change in estimating method 575,000  
Loan portfolio risk factor 1.15 1.15
Days loans are past due to be nonperforming loans 90 days  
Allowance for loan losses related to TDRs modified 73,000 6,000
Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, gross 11,763,000 6,979,000
TDR loans, commitments to lend additional funds 0 192,000
Qualitative Factor Economic Condition
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan portfolio risk factor 1.20 1.20
Qualitative Factor Past Due Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan portfolio risk factor 1.20 1.20
Qualitative Factor Other Internal and External Factors
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan portfolio risk factor 1.20 1.20
Overall Qualitative Factor
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Increase in estimated allowance for loan losses 419,000 317,000
Director of the Bank
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans purchased for related party 473,000  
Loans, related party 1,000,000 1,200,000
Residential
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans secured by residential properties, loan-to-value ratios 90.00%  
Loans, gross 4,500,000  
Loans serviced for the benefit of others 210,000 269,000
Classified Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Increase in estimated allowance for loan losses 664,000 172,000
Home Equity and Second Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Increase in allowance for loan losses due to change in estimating method $ 511,000