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OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent |  | $ 322 | $ 699 | $ 1,269
Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |  |
Change in fair value of securities available for sale, pre tax amount |  | 996 | 1,858 | 3,757
Change in fair value of cash flow hedges, pre tax amount |  | 307 | 1,133 | (776)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, before Tax | [1] | (441) | (2,520) | (2,828)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent |  | 748 | 3,653 | 2,052
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | (995) | (383) | 438
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 278 | 238 | 243
Amortization of certain costs included in net periodic retirement costs, pre tax amount |  | (276) | (276) | (294)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [2] | (441) | 131 | 975
Total other comprehensive loss, pre tax amount |  | (692) | 1,952 | (325)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |  | 321 | 710 | 1,434
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  | (125) | (453) | 299
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Tax | [1] | 180 | 1,030 | 1,152
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent |  | (305) | (1,483) | (853)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  | 407 | 157 | (193)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | (113) | (97) | (99)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax |  | (113) | (113) | (119)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [2] | 181 | (53) | (411)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent |  | 198 | (837) | 5
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax |  | (675) | (1,148) | (2,323)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent |  | (677) | (1,133) | (2,083)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | 182 | 680 | (477)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Net of Tax | [1] | (261) | (1,490) | (1,676)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent |  | 443 | 2,170 | 1,199
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  | (588) | (226) | 245
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 165 | 141 | 144
Amortization of certain costs included in net periodic retirement costs, after tax amount |  | 163 | 163 | 175
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [2] | (260) | 78 | 564
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (494) | 1,115 | (320)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 3 | (26) | (405)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | (1) | 11 | 165
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 2 | (15) | (240)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | $ (999) | $ (1,832) | $ (3,352)
[1] | Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, will be recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain had amortized to $137,000, $281,000, and $427,000 at December 31, 2017, 2016, and 2015, respectively.
[2] | The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 15 - Employee Benefit Plans.

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