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Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 18,166us-gaap_NetIncomeLoss	$ 18,009us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax
Unrealized net holding (losses) gains arising during the period (pre-tax amounts of ($4,842) and ($8,623))	2,959us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	5,208us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for net gains related to securities available for sale included in net income (pre-tax amounts of $14 and $7)	(9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	(4)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 $307 and $-)	204us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Pension and other benefits:
Amortization of prior service cost and actuarial gains (pre-tax amounts of $560 and $19)	342us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	11us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Total other comprehensive (loss) income	3,496us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5,215us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 21,662us-gaap_ComprehensiveIncomeNetOfTax	$ 23,224us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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