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Short-term borrowings (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Short-term Debt [Line Items]      
Notes payable - U.S. Treasury $ 0 $ 254,749 $ 273,948
FHLB 0 0 4,000,000
Short-term borrowings $ 0 $ 254,749 $ 4,273,948