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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Change in unrealized holding gain or loss on securities available-for-sale: |  |
Change in net unrealized gain or loss during the period | $ (15,534) | $ 10,260
Reclassification adjustment for net (gains) losses included in net gain on securities and other assets | (1,187) | (8)
Net change | (16,721) | 10,252
Tax expense | (5,329) | 3,208
Net change in unrealized holding gain or loss on securities available-for-sale | (11,392) | 7,044
Change in pension and other postretirement obligations: |  |
Reclassification adjustment for expense included in other expense | (422) | 95
Reclassification adjustment for curtailment loss | 1,543 |
Change in the net actuarial gain or loss | 885 | 176
Net change | 2,006 | 271
Tax expense | 635 | 86
Net change in pension and other postretirement obligations | 1,371 | 185
Change in unrealized gain or loss on derivatives: |  |
Change in net unrealized gain or loss during the period | 21,453 | (20,581)
Reclassification adjustment for expense included in interest expense | 854 | 204
Net change | 22,307 | (20,377)
Tax benefit | 5,831 | (6,456)
Net change in unrealized gain or loss on derivatives | 16,476 | (13,921)
Other comprehensive income (loss), net of tax | $ 6,455 | $ (6,692)

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