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OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unrealized gains on available-for- sale securities, before tax amount [Abstract]      
Unrealized gains (losses) arising during holding period, before tax amount $ 26,016us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ (61,640)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 3,043us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustment for net (gains) realized in net income, before tax amount (37)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1] (46)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1] (442)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Recognized employee benefit plan net (48,187)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [2] 27,128us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [2] (12,930)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Other comprehensive income (loss), before tax amount (22,208)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (34,558)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (10,329)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Unrealized gains on available-for- sale securities, tax (expense) benefit [Abstract]      
Unrealized gains (losses) arising during holding period, tax (expense) benefit (9,965)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 23,603us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (1,171)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for net (gains) losses realized in net income, tax (expense) benefit 14us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1] 18us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1] 169us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Change in pension funding status cost, tax (expense) benefit 18,432us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax [2] (10,376)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax [2] 4,946us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Other comprehensive (loss) income, tax (expense) benefit 8,481us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 13,245us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 3,944us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Unrealized gains on available-for- sale securities, net of tax amount [Abstract]      
Unrealized gains (losses) arising during holding period, net of tax amount 16,051us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (38,037)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 1,872us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for net (gains) losses realized in net income, net of tax amount (23)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (28)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (273)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Change in pension funding status cost, net of tax amount (29,755)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [2] 16,752us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [2] (7,984)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Other comprehensive (loss) income $ (13,727)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (21,313)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (6,385)us-gaap_OtherComprehensiveIncomeLossNetOfTax
[1] Reclassification adjustments for net gains on available-for-sale securities are reported as security gains, net on the consolidated statement of income.
[2] Recognized employee benefit plan net periodic benefit cost include amortization of unrecognized transition amount, recognized prior service cost and recognized net loss. For more information, see Footnote 14 - Pension, Other Post Retirement Benefit and Profit Sharing Plans.