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Income Taxes (Schedule of Reconciliation of Expected Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Expected income tax expense									$ 11,127us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 10,756us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 10,917us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
(Reductions) increases resulting from:
Tax-exempt income									(3,896)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(3,297)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(3,633)us-gaap_IncomeTaxReconciliationTaxExemptIncome
State taxes, net of federal benefit									751us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(528)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	493us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net									(223)us-gaap_IncomeTaxReconciliationOtherAdjustments	303us-gaap_IncomeTaxReconciliationOtherAdjustments	110us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense	$ 1,902us-gaap_IncomeTaxExpenseBenefit	$ 2,013us-gaap_IncomeTaxExpenseBenefit	$ 1,958us-gaap_IncomeTaxExpenseBenefit	$ 1,886us-gaap_IncomeTaxExpenseBenefit	$ 1,582us-gaap_IncomeTaxExpenseBenefit	$ 1,533us-gaap_IncomeTaxExpenseBenefit	$ 2,106us-gaap_IncomeTaxExpenseBenefit	$ 2,013us-gaap_IncomeTaxExpenseBenefit	$ 7,759us-gaap_IncomeTaxExpenseBenefit	$ 7,234us-gaap_IncomeTaxExpenseBenefit	$ 7,887us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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