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Income Taxes Reconciliation of Income Tax (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Anticipated income tax expense $ 4,626,555us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 7,346,074us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 5,467,168us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit 55,188us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 45,471us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 107,580us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax-exempt interest income (net of amortization) (876,365)us-gaap_IncomeTaxReconciliationTaxExemptIncome (772,545)us-gaap_IncomeTaxReconciliationTaxExemptIncome (757,005)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Other, net 10,622us-gaap_IncomeTaxReconciliationOtherAdjustments 127,000us-gaap_IncomeTaxReconciliationOtherAdjustments 71,257us-gaap_IncomeTaxReconciliationOtherAdjustments
Total $ 3,816,000us-gaap_IncomeTaxExpenseBenefit $ 6,746,000us-gaap_IncomeTaxExpenseBenefit $ 4,889,000us-gaap_IncomeTaxExpenseBenefit
U.S. Federal statutory income tax rate 34.30%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.10%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate