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Investment Securities - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Investment [Line Items]    
Carrying values of Investment securities, pledged as collateral for public deposits $ 107,788,715 $ 141,330,905
Pooled Trust Preferred Securities
   
Investment [Line Items]    
Unrealized loss on other investments $ 287,209 $ 1,064,167