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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, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Before Tax |  |  |  |  |  |
Amortization |  |  |  |  | $ (1,976) | $ 0
Other comprehensive income (loss), before tax | $ (52,654) |  | $ 2,633 |  | (161,015) | (20,735)
Tax Effect |  |  |  |  |  |
Other comprehensive income, tax | (13,569) |  | 718 |  | (42,543) | (5,533)
Net of Tax |  |  |  |  |  |
Other comprehensive loss | (39,085) | $ (79,387) | 1,915 | $ (17,117) | (118,472) | (15,202)
Net unrealized gains on investment securities |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, before tax | (61,628) |  | 2,407 |  | (170,076) | (21,212)
Reclassification from AOCI, before tax |  |  | (50) |  |  | (50)
Amortization | 1,976 |  |  |  | 1,976 |
Other comprehensive income (loss), before tax | (59,652) |  | 2,357 |  | (168,100) | (21,262)
Tax Effect |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | (16,478) |  | 643 |  | (45,476) | (5,675)
Less: Amortization of unrealized losses on investment securities transferred to held-to-maturity | 528 |  |  |  | 528 |
Reclassification from AOCI, tax |  |  | (13) |  |  | (13)
Other comprehensive income, tax | (15,950) |  | 630 |  | (44,948) | (5,688)
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | (45,150) |  | 1,764 |  | (124,600) | (15,537)
Amortization of unrealized losses on investment securities transferred to held-to-maturity | 1,448 |  |  |  | 1,448 |
Reclassification from AOCI, net of tax |  |  | (37) |  |  | (37)
Other comprehensive loss | (43,702) |  | 1,727 |  | (123,152) | (15,574)
Net change in fair value of derivatives: |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, before tax | 2,930 |  |  |  | 2,880 |
Other comprehensive income (loss), before tax | 2,930 |  |  |  | 2,880 |
Tax Effect |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 783 |  |  |  | 770 |
Other comprehensive income, tax | 783 |  |  |  | 770 |
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 2,147 |  |  |  | 2,110 |
Other comprehensive loss | 2,147 |  |  |  | 2,110 |
Amortization of net actuarial loss |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | 131 |  | 272 |  | 264 | 518
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 35 |  | 87 |  | 71 | 153
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 96 |  | 185 |  | 193 | 365
Amortization of net transition obligation |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | 5 |  | 4 |  | 9 | 9
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 1 |  | 1 |  | 2 | 2
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 4 |  | 3 |  | 7 | 7
Settlement |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | 4,884 |  |  |  | 4,884 |
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | 1,817 |  |  |  | 1,817 |
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | 3,067 |  |  |  | 3,067 |
Defined benefit retirement plan and SERPs |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive income (loss), before tax | (4,068) |  | (276) |  | (4,205) | (527)
Tax Effect |  |  |  |  |  |
Other comprehensive income, tax | (1,598) |  | (88) |  | (1,635) | (155)
Net of Tax |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | (697) |  | 0 |  | (697) | 0
Reclassification from AOCI, net of tax | 3,167 |  | 188 |  | 3,267 | 372
Other comprehensive loss | 2,470 |  | $ 188 |  | 2,570 | $ 372
Net actuarial losses arising during the period |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification from AOCI, before tax | (952) |  |  |  | (952) |
Tax Effect |  |  |  |  |  |
Reclassification from AOCI, tax | (255) |  |  |  | (255) |
Net of Tax |  |  |  |  |  |
Reclassification from AOCI, net of tax | $ (697) |  |  |  | $ (697) |

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