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Federal Home Loan Bank Borrowings - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Advance
Dec. 31, 2012
Sep. 30, 2013
Federal Home Loan Bank Advances Mature In 2014 [Member]
Sep. 30, 2013
Federal Home Loan Bank Advances Mature in 2018 [Member]
Sep. 30, 2013
Federal Home Loan Bank Advances Mature in 2023 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Federal Home Loan Bank, the remaining maximum borrowing capacity $ 41,200,000        
Federal Home Loan Bank borrowings 3,538,695 3,606,411   1,999,072 1,539,623
Number of fixed rate amortizing advances 3        
Subsidiary bank had three fixed rate amortizing advances 3,538,695        
Federal Home Loan Bank, advances, weighted average interest rate 4.78%        
Advances from Federal Home Loan Banks, Maturity Year       2018 2023
Borrowings outstanding under credit agreement with the federal Home Loan Bank 0 0      
Line of credit facility agreement with the Federal Home Loan Bank, the available maximum credit facility   $ 7,000,000 $ 19,400,000    
Line of credit facility expiration date     May 01, 2014