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Income Taxes (Income Tax Rate Reconciliation) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, Tax Exempt Income (7.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (6.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (6.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (3.70%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective Income Tax Rate, Continuing Operations, Total 25.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 24.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations