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Long-term Borrowings (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank of Atlanta, convertible advances $ 20,000,000    
Federal Home Loan Bank of Atlanta
     
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank of Atlanta, convertible advances $ 20,000,000 $ 20,000,000 $ 20,000,000