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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 25,490us-gaap_NetIncomeLoss	$ 23,312us-gaap_NetIncomeLoss	$ 28,577us-gaap_NetIncomeLoss
Other comprehensive income (loss), before tax: Available-for-sale securities:
Unrealized (losses) gains on securities available for sale with other-than-temporary impairment	(1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities	(1,277)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities	1,036us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Unrealized gains (losses) on securities available for sale without other-than-temporary impairment	12,914us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(19,964)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	7,280us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: reclassification adjustment for losses (gains) realized in net income	1,385us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(399)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(483)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Less: reclassification adjustment for credit related other-than-temporary impairments recognized in net income	737us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	320us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	942us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Unrealized gains (losses) on available-for-sale securities	15,035us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	(21,320)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	8,775us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Employee benefit plans:
Net actuarial (loss) gain on pension and other postretirement benefit plans	(642)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	758us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	(195)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Net prior service cost attributed to plan amendments		(380)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Less: reclassification adjustment for amortization of prior service cost and net actuarial loss included in net periodic benefit cost	260us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	327us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	268us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
Unrealized (losses) gains on employee benefit plans	(382)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	705us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	73us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive income (loss), before tax	14,653us-gaap_OtherComprehensiveIncomeLossBeforeTax	(20,615)us-gaap_OtherComprehensiveIncomeLossBeforeTax	8,848us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax (expense) benefit	(5,518)us-gaap_OtherComprehensiveIncomeLossTax	7,700us-gaap_OtherComprehensiveIncomeLossTax	(3,345)us-gaap_OtherComprehensiveIncomeLossTax
Net comprehensive (loss) gain	9,135us-gaap_OtherComprehensiveIncomeLossNetOfTax	(12,915)us-gaap_OtherComprehensiveIncomeLossNetOfTax	5,503us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income	$ 34,625us-gaap_ComprehensiveIncomeNetOfTax	$ 10,397us-gaap_ComprehensiveIncomeNetOfTax	$ 34,080us-gaap_ComprehensiveIncomeNetOfTax

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