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Comprehensive Income/Loss (Comprised of the following Components) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Rollforward]    
Beginning Balance $ (2,132)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (7,434)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Net change in other comprehensive income (loss) 1,719us-gaap_OtherComprehensiveIncomeLossNetOfTax 2,380us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending Balance (413)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (5,054)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized Gain on Securities    
Accumulated Other Comprehensive Income (Loss) [Rollforward]    
Beginning Balance 3,389us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
(2,023)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Net change in other comprehensive income (loss) 1,561us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
1,917us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Ending Balance 4,950us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
(106)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Unrealized Loss on Cash Flow Hedge    
Accumulated Other Comprehensive Income (Loss) [Rollforward]    
Beginning Balance (3,298)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(5,698)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Net change in other comprehensive income (loss) 119us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
539us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Ending Balance (3,179)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(5,159)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Deferred Gain on Hedge Transactions    
Accumulated Other Comprehensive Income (Loss) [Rollforward]    
Beginning Balance 571us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DeferredDerivativeGainLossMember
715us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DeferredDerivativeGainLossMember
Net change in other comprehensive income (loss) (37)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DeferredDerivativeGainLossMember
(37)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DeferredDerivativeGainLossMember
Ending Balance 534us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DeferredDerivativeGainLossMember
678us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DeferredDerivativeGainLossMember
Defined Benefit Postretirement Plans    
Accumulated Other Comprehensive Income (Loss) [Rollforward]    
Beginning Balance (2,794)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
(428)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Net change in other comprehensive income (loss) 76us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
(39)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Ending Balance $ (2,718)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
$ (467)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember