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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net unrealized gains/losses on investment securities, Before Tax |  |  |
Net unrealized gains/(losses) arising during the period | $ 37,696 | $ (19,063) | $ (838)
Less: Reclassification adjustment for losses realized in net income | (36) | (279) | 1,410
Net unrealized gains/(losses) on investment securities | 37,660 | (19,342) | 572
Defined benefit plans, Before Tax |  |  |
Net actuarial gains/losses arising during the period | (1,106) | 264 | (1,318)
Other comprehensive income (loss) | 37,707 | (17,889) | 721
Net unrealized gains/losses on investment securities, Tax Effect |  |  |
Net unrealized gains/losses arising during the period | 10,102 | (5,145) | (333)
Less: Reclassification adjustment for gains/losses realized in net income | (10) | (75) | 561
Net unrealized gains (losses) on investment securities | 10,092 | (5,220) | 228
Defined benefit plans, Tax Effect |  |  |
Net actuarial gains/losses arising during the period | (296) | 71 | (518)
Other comprehensive income (loss) | 10,105 | (4,810) | 239
Net unrealized gains/losses on investment securities, Net of Tax |  |  |
Net unrealized gains/losses arising during the period | 27,594 | (13,918) | (505)
Less: Reclassification adjustment for gains/losses realized in net income | (26) | (204) | 849
Net unrealized gains (losses) on investment securities | 27,568 | (14,122) | 344
Defined benefit plans, Net of Tax |  |  |
Net actuarial gains/losses arising during the period | (810) | 193 | (800)
Amounts reclassified from AOCI | 818 |  | 1,787
Total other comprehensive income (loss), net of tax | 27,602 | (13,079) | 482
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation | 1,117 | 1,153 | 1,293
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation | 299 | 329 | 460
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 818 | 824 | 833
Accumulated Defined Benefit Plans Adjustment, Net Transition 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 | 5 | 7
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 13 | 13 | 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 | 5 | 7
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 13 | 13 | 11
Accumulated Defined Benefit Plans, Settlement Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation |  |  | 138
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation |  |  | 55
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI |  |  | 83
Defined Benefit Plans |  |  |
Defined benefit plans, Before Tax |  |  |
Other comprehensive income (loss) | (47) | (1,453) | (149)
Defined benefit plans, Tax Effect |  |  |
Other comprehensive income (loss) | (13) | (410) | (11)
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 844 | 850 | 938
Total other comprehensive income (loss), net of tax | $ 34 | $ 1,043 | $ 138

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