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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net unrealized gains/losses on investment securities, Before Tax |  |  |
Net unrealized gains/(losses) arising during the period | $ (838) | $ (7,397) | $ (9,184)
Less: Reclassification adjustment for losses realized in net income | 1,410 | 0 | 1,866
Net unrealized gains/(losses) on investment securities | 572 | (7,397) | (7,318)
Defined benefit plans, Before Tax |  |  |
Net actuarial gains/losses arising during the period | (1,318) | (963) | 687
Other comprehensive income (loss) | 721 | (2,879) | (4,909)
Net unrealized gains/losses on investment securities, Tax Effect |  |  |
Net unrealized gains/losses arising during the period | (333) | (2,945) | (3,655)
Less: Reclassification adjustment for gains/losses realized in net income | 561 | 0 | 742
Net unrealized gains (losses) on investment securities | 228 | (2,945) | (2,913)
Defined benefit plans, Tax Effect |  |  |
Net actuarial gains/losses arising during the period | (518) | (385) | 274
Other comprehensive income (loss) | 239 | (1,155) | (1,953)
Net unrealized gains/losses on investment securities, Net of Tax |  |  |
Net unrealized gains/losses arising during the period | (505) | (4,452) | (5,529)
Less: Reclassification adjustment for gains/losses realized in net income | 849 | 0 | 1,124
Net unrealized gains (losses) on investment securities | 344 | (4,452) | (4,405)
Defined benefit plans, Net of Tax |  |  |
Net actuarial gains/losses arising during the period | (800) | (578) | 413
Amounts reclassified from AOCI | 1,787 | 3,306 | 2,160
Total other comprehensive income (loss), net of tax | 482 | (1,724) | (2,956)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation | 1,293 | 1,599 | 1,688
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation | 460 | 634 | 672
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 833 | 965 | 1,016
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member] |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization of net transition obligation | 18 | 17 | 16
Defined benefit plans, Tax Effect |  |  |
Amortization of net transition obligation | 7 | 6 | 7
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 11 | 11 | 9
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 | 7 | 7 | 7
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 11 | 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) | (149) | (4,518) | (2,409)
Defined benefit plans, Tax Effect |  |  |
Other comprehensive income (loss) | (11) | (1,790) | (960)
Defined benefit plans, Net of Tax |  |  |
Amounts reclassified from AOCI | 938 | 3,306 | 1,036
Total other comprehensive income (loss), net of tax | $ 138 | $ 2,728 | $ 1,449

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