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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Net unrealized gains/losses on investment securities, Before Tax |  |
Net unrealized gains (losses) arising during the period | $ 19,683 | $ 11,476
Less: Reclassification adjustment for gains (losses) realized in net income | 0 | 0
Net unrealized gains (losses) on investment securities | 19,683 | 11,476
Defined benefit plans, Before Tax |  |
Amortization of net actuarial losses | 367 | 420
Amortization of net transition obligation | 4 | 4
Amortization of prior service cost | 5 | 5
Defined benefit plans, net | 376 | 429
Other comprehensive income (loss) | 20,059 | 11,905
Net unrealized gains/losses on investment securities, Tax Effect |  |
Net unrealized gains (losses) arising during the period | 7,830 | 4,567
Less: Reclassification adjustment for gains (losses) realized in net income | 0 | 0
Net unrealized gains (losses) on investment securities | 7,830 | 4,567
Defined benefit plans, Tax Effect |  |
Amortization of net actuarial losses | 124 | 165
Amortization of net transition obligation | 1 | 2
Amortization of prior service cost | 1 | 2
Defined benefit plans, net | 126 | 169
Other comprehensive income | 7,956 | 4,736
Net unrealized gains/losses on investment securities, Net of Tax |  |
Net unrealized gains (losses) arising during the period | 11,853 | 6,909
Less: Reclassification adjustment for gains (losses) realized in net income | 0 | 0
Net unrealized gains (losses) on investment securities | 11,853 | 6,909
Defined benefit plans, Net of Tax |  |
Amortization of net actuarial losses | 243 | 255
Amortization of net transition obligation | 3 | 2
Amortization of prior service cost | 4 | 3
Defined benefit plans, net | 250 | 260
Total other comprehensive income, net of tax | $ 12,103 | $ 7,169

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