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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Change in unrealized holding gain or loss on securities available-for-sale: |  |  |  |  |  |  |  |
Change in net unrealized gain or loss during the period | $ (8,654) |  |  | $ 1,716 |  |  | $ (15,222) | $ 15,769
Reclassification adjustment for net gains included in net gain on securities and other assets |  |  |  | (215) |  |  | (1,207) | (3,357)
Net change | (8,654) |  |  | 1,501 |  |  | (16,429) | 12,412
Tax (benefit) expense | (2,714) |  |  | 475 |  |  | (5,226) | 3,931
Net change in unrealized holding gain or loss on securities available-for-sale, net of reclassification adjustments and tax | (5,940) |  |  | 1,026 |  |  | (11,203) | 8,481
Change in pension and other postretirement obligations: |  |  |  |  |  |  |  |
Reclassification adjustment for expense included in other expense | (735) |  |  | 4 |  |  | (1,595) | 194
Reclassification adjustment for curtailment loss |  |  |  |  |  |  | 1,543 |
Change in the net actuarial gain or loss | 941 |  |  | 267 |  |  | 2,470 | 619
Net change | 206 |  |  | 271 |  |  | 2,418 | 813
Tax expense | 65 |  |  | 86 |  |  | 795 | 257
Net change in pension and other postretirement obligations | 141 |  |  | 185 |  |  | 1,623 | 556
Change in unrealized gain or loss on derivatives: |  |  |  |  |  |  |  |
Change in net unrealized gain or loss during the period | 225 |  |  | 100 |  |  | 3,767 | (25,098)
Reclassification adjustment for loss included in loss on termination of derivatives |  |  |  |  |  |  | 16,505 |
Reclassification adjustment for expense included in interest expense | 38 |  |  | 2,319 |  |  | 902 | 3,679
Net change | 263 |  |  | 2,419 |  |  | 21,174 | (21,419)
Tax expense (benefit) | 82 |  |  | 766 |  |  | 6,712 | (6,783)
Net change in unrealized gain or loss on derivatives, net of reclassification adjustments and tax | 181 |  |  | 1,653 |  |  | 14,462 | (14,636)
Total other comprehensive (loss) income, net of tax | $ (5,618) | $ 4,045 | $ 6,455 | $ 2,864 | $ (1,771) | $ (6,692) | $ 4,882 | $ (5,599)

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