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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
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 75,074us-gaap_NetIncomeLoss $ 61,747us-gaap_NetIncomeLoss $ 54,558us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax      
Unrealized net holding gains (losses) arising during the year (pre-tax amounts of $18,069, ($41,059), and ($2,471) 11,447us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (24,794)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (1,492)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for net gains related to securities available for sale included in net income (pre-tax amounts of $92, $1,426, and $599) (56)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax (861)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax (362)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity (pre-tax amounts of ($421), $0, and $0) (257)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Amortization of prior service cost and actuarial gains (pre-tax amounts of $75, $2,790, and $3,593) 46us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 1,601us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 2,092us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
(Increase) Decrease in prior service cost and unrecognized actuarial loss (pre-tax amounts of ($19,245), $21,923, and $(24)) (11,442)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 13,169us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (14)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Total other comprehensive (loss) income (262)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (10,885)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 224us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 74,812us-gaap_ComprehensiveIncomeNetOfTax $ 50,862us-gaap_ComprehensiveIncomeNetOfTax $ 54,782us-gaap_ComprehensiveIncomeNetOfTax