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Income Taxes Reconciliation of Income Tax (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Anticipated income tax expense $ 6,115,306 $ 4,626,555 $ 7,346,074
State income taxes, net of federal income tax benefit 22,304 55,188 45,471
Tax-exempt interest income (net of amortization) (981,712) (876,365) (772,545)
Other, net 72,102 10,622 127,000
Total $ 5,228,000 $ 3,816,000 $ 6,746,000
U.S. Federal statutory income tax rate 34.40% 34.30% 34.10%