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Securities Available for Sale (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of gain (Loss) on securities transactions      
Gross realized gains $ 1,555,656us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 4,284,934us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 4,092,585us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses (13,067)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (229,122)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Gains on Sale of Securities Transactions, net $ 1,542,589us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet $ 4,055,812us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet $ 4,092,585us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet