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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 52,962 us-gaap_NetIncomeLoss | $ 48,215 us-gaap_NetIncomeLoss | $ 38,945 us-gaap_NetIncomeLoss
Unrealized (loss) gain on available-for-sale securities arising during period | 6,388 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (8,244)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 5,370 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustment for net gains | (1,156)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (764)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (954)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Other comprehensive income (loss), available-for-sale securities | 5,232 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax | (9,008)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax | 4,416 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Amortization of actuarial net gains | 669 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax | 895 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax | 696 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Recognition of unrealized gains (losses) | (4,584)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | 2,457 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | (1,119)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Change in underfunded pension liability | (3,915)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax | 3,352 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax | (423)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive (loss) income before income taxes | 1,317 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (5,656)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | 3,993 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Tax effect | (486)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | 2,088 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (1,508)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive (loss) income, net of tax | 831 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (3,568)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 2,485 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income, net of tax | $ 53,793 us-gaap_ComprehensiveIncomeNetOfTax | $ 44,647 us-gaap_ComprehensiveIncomeNetOfTax | $ 41,430 us-gaap_ComprehensiveIncomeNetOfTax

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