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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, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Before Tax |  |  |  |  |  |
Other comprehensive income (loss), before tax | $ 2,633 |  | $ 8,846 |  | $ (20,735) | $ 23,408
Tax Effect |  |  |  |  |  |
Other comprehensive income, tax | 718 |  | 2,367 |  | (5,533) | 6,266
Net of Tax |  |  |  |  |  |
Total other comprehensive income (loss), net of tax | 1,915 | $ (17,117) | 6,479 | $ 10,663 | (15,202) | 17,142
Net unrealized gains on investment securities |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, before tax | 2,407 |  | 8,570 |  | (21,212) | 22,428
Reclassification from AOCI, before tax | (50) |  | 0 |  | (50) | 0
Other comprehensive income (loss), before tax | 2,357 |  | 8,570 |  | (21,262) | 22,428
Tax Effect |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 643 |  | 2,295 |  | (5,675) | 6,006
Reclassification from AOCI, tax | (13) |  | 0 |  | (13) | 0
Other comprehensive income, tax | 630 |  | 2,295 |  | (5,688) | 6,006
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 1,764 |  | 6,275 |  | (15,537) | 16,422
Reclassification from AOCI, net of tax | (37) |  | 0 |  | (37) | 0
Total other comprehensive income (loss), net of tax | 1,727 |  | 6,275 |  | (15,574) | 16,422
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 | 272 |  | 269 |  | 518 | 537
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 87 |  | 70 |  | 153 | 142
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 185 |  | 199 |  | 365 | 395
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 |  |  | 7
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax |  |  | 1 |  |  | 2
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax |  |  | 2 |  |  | 5
Defined benefit plans, net |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss), before tax | (276) |  | (276) |  | (527) | (980)
Tax Effect |  |  |  |  |  |
Other comprehensive income, tax | (88) |  | (72) |  | (155) | (260)
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 0 |  | 0 |  | 0 | 313
Reclassification from AOCI, net of tax | 188 |  | 204 |  | 372 | 407
Total other comprehensive income (loss), net of tax | $ 188 |  | $ 204 |  | $ 372 | $ 720

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