Income Taxes (Schedule of Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 5,920us-gaap_CurrentFederalTaxExpenseBenefit	$ 5,018us-gaap_CurrentFederalTaxExpenseBenefit	$ 2,994us-gaap_CurrentFederalTaxExpenseBenefit
State	887	688	430
Deferred:
Federal	3,018	2,855	3,832
State	191	139	206
Investment Tax Credits	(79)us-gaap_DeferredOtherTaxExpenseBenefit	(79)us-gaap_DeferredOtherTaxExpenseBenefit	(79)us-gaap_DeferredOtherTaxExpenseBenefit
Total Income Tax Expense	$ 9,937us-gaap_IncomeTaxExpenseBenefit	$ 8,621us-gaap_IncomeTaxExpenseBenefit	$ 7,383us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods.

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- Definition

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

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