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Loans Net - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Troubled Debt Restructuring
Loan
Mar. 31, 2013
Extended Term of Loan
Loan
Mar. 31, 2013
Financing Receivable Troubled Debt Restructurings Rate Reductions
Loan
Mar. 31, 2013
Before Restructuring
Loan
Mar. 31, 2013
Classified Loan
Dec. 31, 2012
Classified Loan
Mar. 31, 2013
Pass Credit
Mar. 31, 2013
Grade 6 Special Mention
Financing Receivable, Recorded Investment [Line Items]                  
Percentage of loan portfolio considered pass credits               79.00%  
Loans rated as special mention           $ 19,600,000 $ 19,100,000   $ 6,600,000
Recorded investment in loans 2,600,000                
Allowance for loan losses $ 110,000                
Loan considered for troubled debt restructuring   4     2        
Loan Modified     4 2          
Number of days default to occur 90 days