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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]    
Net income $ 32,266us-gaap_NetIncomeLoss $ 28,444us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax    
Unrealized (losses) gains on securities 5,543us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 7,443us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Pension and other postretirement benefits 1,110us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 456us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive (loss) income, net of tax 6,653us-gaap_OtherComprehensiveIncomeLossNetOfTax 7,899us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 38,919us-gaap_ComprehensiveIncomeNetOfTax $ 36,343us-gaap_ComprehensiveIncomeNetOfTax