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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Income | $ 44,453us-gaap_NetIncomeLoss | $ 41,482us-gaap_NetIncomeLoss | $ 41,954us-gaap_NetIncomeLoss
Other comprehensive income (loss), before tax expense (benefit): |  |  |
Unrealized holding gains (losses) on securities arising during the period | 25,153us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (34,975)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (661)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: reclassification adjustment for (gains) losses on securities included in net income | (550)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | 1,158us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (192)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Unrealized holding gains on derivatives arising during the period | 472us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Reclassification adjustment for gains on derivatives included in net income | (10)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Unrealized (losses) gains for postretirement obligations: |  |  |
Transition obligation | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax | 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax
Net (loss) gain | (313)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | 219us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | (300)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Total other comprehensive income (loss), before tax expense (benefit) | 24,752us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (33,598)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (1,151)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax expense (benefit) related to items of other comprehensive income (loss) | 8,663us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (11,751)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (409)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Comprehensive Income | $ 60,542us-gaap_ComprehensiveIncomeNetOfTax | $ 19,635us-gaap_ComprehensiveIncomeNetOfTax | $ 41,212us-gaap_ComprehensiveIncomeNetOfTax

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