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Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 63,816 us-gaap_NetIncomeLoss | $ 22,479 us-gaap_NetIncomeLoss
Unrealized gains and losses on securities: |  |
Change in unrealized securities gains (losses) arising during period | 30,415 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 11,899 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Tax effect | (11,813)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | (4,643)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for gains included in income before income taxes | 5,126 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Tax effect | 1,977 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Total change in unrealized gains and losses on securities, net of tax | 15,453 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 7,256 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Change in fair value of cash flow hedges: |  |
Change in unrecognized loss on cash flow hedges | 576 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | 719 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Tax effect | (222)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | (278)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Total change in unrecognized loss on cash flow hedges, net of tax | 354 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 441 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Change in pension obligation: |  |
Reclassification adjustment for losses included in income before income taxes | 2,886 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax | 1,599 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Tax effect | (1,123)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | (622)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Total change in pension obligation, net of tax | 1,763 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 977 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Net current period other comprehensive income | 17,570 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 8,674 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income | $ 81,386 us-gaap_ComprehensiveIncomeNetOfTax | $ 31,153 us-gaap_ComprehensiveIncomeNetOfTax

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