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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net unrealized gains/losses on investment securities, Before Tax |  |  |
Net unrealized gains/(losses) arising during the period | $ (7,397) | $ (9,184) | $ 36,780
Less: Reclassification adjustment for losses realized in net income | 0 | 1,866 | 1,071
Net unrealized gains/(losses) on investment securities | (7,397) | (7,318) | 37,851
Defined benefit plans, Before Tax |  |  |
Net actuarial gains/losses arising during the period | (963) | 687 | (7,409)
Amortization of net actuarial losses | 1,599 | 1,688 | 1,070
Amortization of net transition obligation | 17 | 16 | 17
Amortization of prior service cost | 18 | 18 | 18
Settlement | 3,847 |  |
Defined benefit plans, net | 4,518 | 2,409 | (6,304)
Other comprehensive income (loss) | (2,879) | (4,909) | 31,547
Net unrealized gains/losses on investment securities, Tax Effect |  |  |
Net unrealized gains/losses arising during the period | (2,945) | (3,655) | 14,714
Less: Reclassification adjustment for gains/losses realized in net income | 0 | 742 | 426
Net unrealized gains (losses) on investment securities | (2,945) | (2,913) | 15,140
Defined benefit plans, Tax Effect |  |  |
Net actuarial gains/losses arising during the period | (385) | 274 | (3,052)
Amortization of net actuarial losses | 634 | 672 | 441
Amortization of net transition obligation | 6 | 7 | 7
Amortization of prior service cost | 7 | 7 | 7
Settlement | 1,528 |  |
Defined benefit plans, net | 1,790 | 960 | (2,597)
Other comprehensive income (loss) | (1,155) | (1,953) | 12,543
Net unrealized gains/losses on investment securities, Net of Tax |  |  |
Net unrealized gains/losses arising during the period | (4,452) | (5,529) | 22,066
Less: Reclassification adjustment for gains/losses realized in net income | 0 | 1,124 | 645
Net unrealized gains (losses) on investment securities | (4,452) | (4,405) | 22,711
Defined benefit plans, Net of Tax |  |  |
Net actuarial gains/losses arising during the period | (578) | 413 | (4,357)
Amortization of net actuarial losses | 965 | 1,016 | 629
Amortization of net transition obligation | 11 | 9 | 10
Amortization of prior service cost | 11 | 11 | 11
Settlement | 2,319 |  |
Defined benefit plans, net | 2,728 | 1,449 | (3,707)
Other comprehensive income (loss), net of tax | $ (1,724) | $ (2,956) | $ 19,004

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