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Federal Income Taxes (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Federal Income Taxes [Abstract]    
Effective tax rate 17.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 23.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Federal rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate