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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Before Tax |  |  |  |
Other comprehensive income (loss), before tax | $ 10,112 | $ (18,456) | $ 30,171 | $ (6,551)
Tax Effect |  |  |  |
Other comprehensive income, tax | 3,997 | (7,342) | 11,953 | (2,606)
Net of Tax |  |  |  |
Total other comprehensive income (loss), net of tax | 6,115 | (11,114) | 18,218 | (3,945)
Net unrealized gains on investment securities |  |  |  |
Before Tax |  |  |  |
Other comprehensive income (loss) before reclassification, before tax | 9,737 | (20,752) | 29,420 | (9,276)
Reclassification from AOCI, before tax | 0 | 1,866 | 0 | 1,866
Other comprehensive income (loss), before tax | 9,737 | (18,886) | 29,420 | (7,410)
Tax Effect |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 3,871 | (8,259) | 11,701 | (3,692)
Reclassification from AOCI, tax | 0 | 743 | 0 | 743
Other comprehensive income, tax | 3,871 | (7,516) | 11,701 | (2,949)
Net of Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 5,866 | (12,493) | 17,719 | (5,584)
Reclassification from AOCI, net of tax | 0 | 1,123 | 0 | 1,123
Total other comprehensive income (loss), net of tax | 5,866 | (11,370) | 17,719 | (4,461)
Net actuarial losses |  |  |  |
Before Tax |  |  |  |
Reclassification from AOCI, before tax | 366 | 421 | 733 | 841
Tax Effect |  |  |  |
Reclassification from AOCI, tax | 124 | 170 | 248 | 335
Net of Tax |  |  |  |
Reclassification from AOCI, net of tax | 242 | 251 | 485 | 506
Amortization of net transition obligation |  |  |  |
Before Tax |  |  |  |
Reclassification from AOCI, before tax | 4 | 4 | 8 | 8
Tax Effect |  |  |  |
Reclassification from AOCI, tax | 1 | 2 | 2 | 4
Net of Tax |  |  |  |
Reclassification from AOCI, net of tax | 3 | 2 | 6 | 4
Amortization of prior service cost |  |  |  |
Before Tax |  |  |  |
Reclassification from AOCI, before tax | 5 | 5 | 10 | 10
Tax Effect |  |  |  |
Reclassification from AOCI, tax | 1 | 2 | 2 | 4
Net of Tax |  |  |  |
Reclassification from AOCI, net of tax | 4 | 3 | 8 | 6
Defined benefit plans, net |  |  |  |
Before Tax |  |  |  |
Reclassification from AOCI, before tax | 375 | 430 | 751 | 859
Tax Effect |  |  |  |
Reclassification from AOCI, tax | 126 | 174 | 252 | 343
Net of Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 0 | 0 | 0 | 0
Reclassification from AOCI, net of tax | 249 | 256 | 499 | 516
Total other comprehensive income (loss), net of tax | $ 249 | $ 256 | $ 499 | $ 516

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