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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 5,958us-gaap_NetIncomeLoss	$ 5,725us-gaap_NetIncomeLoss
Other comprehensive income, before tax: Available-for-sale securities:
Unrealized gains on securities available for sale with other-than-temporary impairment		482us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Unrealized gains on securities available for sale without other-than-temporary impairment	1,617us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	5,706us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: reclassification adjustment for losses (gains) realized in net income	23us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(45)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Less: reclassification adjustment for credit related other-than-temporary impairments recognized in net income		264us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Unrealized gains on available-for-sale securities	1,640us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	6,407us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Employee benefit plans:
Net actuarial (loss) gain on pension and other postretirement benefit plans	(98)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	29us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Less: reclassification adjustment for amortization of prior service cost and net actuarial loss included in net periodic benefit cost	82us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	65us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
Unrealized (losses) gains on employee benefit plans	(16)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	94us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive income (loss), before tax	1,624us-gaap_OtherComprehensiveIncomeLossBeforeTax	6,501us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax expense	(610)us-gaap_OtherComprehensiveIncomeLossTax	(2,448)us-gaap_OtherComprehensiveIncomeLossTax
Net comprehensive gain (loss)	1,014us-gaap_OtherComprehensiveIncomeLossNetOfTax	4,053us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income	$ 6,972us-gaap_ComprehensiveIncomeNetOfTax	$ 9,778us-gaap_ComprehensiveIncomeNetOfTax

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