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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (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
Change in unrealized holding gain or loss on securities available-for-sale: |  |  |  |  |  |
Change in net unrealized gain or loss during the period | $ 8,966 |  | $ 3,793 |  | $ (6,568) | $ 14,053
Reclassification adjustment for net gains included in net gain on securities and other assets | (20) |  | (3,134) |  | (1,207) | (3,142)
Net change | 8,946 |  | 659 |  | (7,775) | 10,911
Tax expense (benefit) | 2,817 |  | 248 |  | (2,512) | 3,456
Net change in unrealized holding gain or loss on securities available-for-sale, net of reclassification adjustments and tax | 6,129 |  | 411 |  | (5,263) | 7,455
Change in pension and other postretirement obligations: |  |  |  |  |  |
Reclassification adjustment for expense included in other expense | (438) |  | 95 |  | (860) | 190
Reclassification adjustment for curtailment loss |  |  |  |  | 1,543 |
Change in the net actuarial gain or loss | 644 |  | 176 |  | 1,529 | 352
Net change | 206 |  | 271 |  | 2,212 | 542
Tax expense | 95 |  | 85 |  | 730 | 171
Net change in pension and other postretirement obligations | 111 |  | 186 |  | 1,482 | 371
Change in unrealized gain or loss on derivatives: |  |  |  |  |  |
Change in net unrealized gain or loss during the period | (1,406) |  | (4,617) |  | 3,542 | (25,198)
Reclassification adjustment for loss included in loss on termination of derivatives |  |  |  |  | 16,505 |
Reclassification adjustment for expense included in interest expense | 10 |  | 1,156 |  | 864 | 1,360
Net change | (1,396) |  | (3,461) |  | 20,911 | (23,838)
Tax expense (benefit) | 799 |  | (1,093) |  | 6,630 | (7,549)
Net change in unrealized gain or loss on derivatives, net of reclassification adjustments and tax | (2,195) |  | (2,368) |  | 14,281 | (16,289)
Total other comprehensive income | $ 4,045 | $ 6,455 | $ (1,771) | $ (6,692) | $ 10,500 | $ (8,463)

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