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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, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Before Tax |  |  |  |  |  |
Other comprehensive income (loss), before tax | $ 8,846 |  | $ 16,892 |  | $ 23,408 | $ 32,189
Tax Effect |  |  |  |  |  |
Other comprehensive income, tax | 2,367 |  | 4,479 |  | 6,266 | 8,538
Net of Tax |  |  |  |  |  |
Total other comprehensive income, net of tax | 6,479 | $ 10,663 | 12,413 | $ 11,238 | 17,142 | 23,651
Net unrealized gains on investment securities |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, before tax | 8,570 |  | 16,620 |  | 22,428 | 31,644
Reclassification from AOCI, before tax | 0 |  | 0 |  | 0 | 0
Other comprehensive income (loss), before tax | 8,570 |  | 16,620 |  | 22,428 | 31,644
Tax Effect |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 2,295 |  | 4,455 |  | 6,006 | 8,483
Reclassification from AOCI, tax | 0 |  | 0 |  | 0 | 0
Other comprehensive income, tax | 2,295 |  | 4,455 |  | 6,006 | 8,483
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 6,275 |  | 12,165 |  | 16,422 | 23,161
Reclassification from AOCI, net of tax | 0 |  | 0 |  | 0 | 0
Total other comprehensive income, net of tax | 6,275 |  | 12,165 |  | 16,422 | 23,161
Net actuarial losses arising during the period |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax |  |  |  |  | 427 |
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax |  |  |  |  | 114 |
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax |  |  |  |  | 313 |
Amortization of net actuarial loss |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | 269 |  | 264 |  | 537 | 527
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 70 |  | 22 |  | 142 | 51
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 199 |  | 242 |  | 395 | 476
Amortization of net transition obligation |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | 4 |  | 4 |  | 9 | 9
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 1 |  | 1 |  | 2 | 2
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 3 |  | 3 |  | 7 | 7
Amortization of prior service cost |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | 3 |  | 4 |  | 7 | 9
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 1 |  | 1 |  | 2 | 2
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 2 |  | 3 |  | 5 | 7
Defined benefit plans, net |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss), before tax | (276) |  | (272) |  | (980) | (545)
Tax Effect |  |  |  |  |  |
Other comprehensive income, tax | (72) |  | (24) |  | (260) | (55)
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 0 |  | 0 |  | 313 | 0
Reclassification from AOCI, net of tax | 204 |  | 248 |  | 407 | 490
Total other comprehensive income, net of tax | $ 204 |  | $ 248 |  | $ 720 | $ 490

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