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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net unrealized gains/losses on investment securities, Before Tax |  |  |
Net unrealized gains/(losses) arising during the period | $ (19,063) | $ (838) | $ (7,397)
Less: Reclassification adjustment for losses realized in net income | (279) | 1,410 | 0
Net unrealized gains/(losses) on investment securities | (19,342) | 572 | (7,397)
Defined benefit plans, Before Tax |  |  |
Net actuarial gains/losses arising during the period | 264 | (1,318) | (963)
Other comprehensive income (loss) | (17,889) | 721 | (2,879)
Net unrealized gains/losses on investment securities, Tax Effect |  |  |
Net unrealized gains/losses arising during the period | (5,145) | (333) | (2,945)
Less: Reclassification adjustment for gains/losses realized in net income | (75) | 561 | 0
Net unrealized gains (losses) on investment securities | (5,220) | 228 | (2,945)
Defined benefit plans, Tax Effect |  |  |
Net actuarial gains/losses arising during the period | 71 | (518) | (385)
Other comprehensive income (loss) | (4,810) | 239 | (1,155)
Net unrealized gains/losses on investment securities, Net of Tax |  |  |
Net unrealized gains/losses arising during the period | (13,918) | (505) | (4,452)
Less: Reclassification adjustment for gains/losses realized in net income | (204) | 849 | 0
Net unrealized gains (losses) on investment securities | (14,122) | 344 | (4,452)
Defined benefit plans, Net of Tax |  |  |
Net actuarial gains/losses arising during the period | 193 | (800) | (578)
Amounts reclassified from AOCI | 646 | 1,787 | 3,306
Total other comprehensive income (loss), net of tax | (13,079) | 482 | (1,724)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation | 1,153 | 1,293 | 1,599
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation | 329 | 460 | 634
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 824 | 833 | 965
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation | 18 | 18 | 17
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation | 5 | 7 | 6
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 13 | 11 | 11
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation | 18 | 18 | 18
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation | 5 | 7 | 7
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 13 | 11 | 11
Accumulated Defined Benefit Plans, Settlement Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation |  | 138 | 3,847
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation |  | 55 | 1,528
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI |  | 83 | 2,319
Defined Benefit Plans |  |  |
Defined benefit plans, Before Tax |  |  |
Other comprehensive income (loss) | (1,453) | (149) | (4,518)
Defined benefit plans, Tax Effect |  |  |
Other comprehensive income (loss) | (410) | (11) | (1,790)
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 850 | 938 | 3,306
Total other comprehensive income (loss), net of tax | $ 1,043 | $ 138 | $ 2,728

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