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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Document Fiscal Year Focus 2015  
Net income $ 3,196,000us-gaap_NetIncomeLoss $ 2,120,000us-gaap_NetIncomeLoss
Interest rate swaps:    
Adjustment for amortization of losses included in net income 5,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax 5,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Income tax expense 2,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 2,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
Post retirement benefit plan adjustments:    
Net actuarial loss 42,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 12,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Prior service costs (124,000)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (124,000)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Income tax benefit 25,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 35,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Comprehensive income 3,142,000us-gaap_ComprehensiveIncomeNetOfTax 2,046,000us-gaap_ComprehensiveIncomeNetOfTax
Derivative [Member]    
Interest rate swaps:    
Income tax expense   2,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_DerivativeMember
Other Postretirement Benefit Plans, Defined Benefit [Member]    
Post retirement benefit plan adjustments:    
Income tax benefit   $ 35,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember