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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

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