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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in unrealized holding gain or loss on securities: |  |  |
Change in net unrealized gain or loss during the period | $ (28,865) | $ 16,432 | $ 9,693
Reclassification adjustment for net gains included in net gain on securities and other assets | (1,207) | (4,592) | (31)
Net change | (30,072) | 11,840 | 9,662
Tax (benefit) expense | (9,514) | 3,767 | 3,084
Net change in unrealized holding gain or loss on securities, net of reclassification adjustments and tax | (20,558) | 8,073 | 6,578
Change in pension and other postretirement obligations: |  |  |
Reclassification adjustment for expense included in other expense | (1,092) | (1,272) | 729
Reclassification adjustment for curtailment loss | 1,543 | (1,651) |
Change in the net actuarial gain or loss | 6,563 | 2,817 | (296)
Net change | 7,014 | (106) | 433
Tax expense | 2,234 | (44) | 167
Net change in pension and other postretirement obligations | 4,780 | (62) | 266
Change in unrealized gain or loss on derivatives: |  |  |
Change in net unrealized gain or loss during the period | 5,277 | (24,449) | (8,254)
Reclassification adjustment for loss included in loss on termination of derivatives | 16,505 | 6,596 |
Reclassification adjustment for expense included in interest expense | 940 | 6,127 | (955)
Net change | 22,722 | (11,726) | (9,209)
Tax expense (benefit) | 7,201 | (3,731) | (2,925)
Net change in unrealized gain or loss on derivatives, net of reclassification adjustments and tax | 15,521 | (7,995) | (6,284)
Total other comprehensive (loss) income, net of tax | $ (257) | $ 16 | $ 560

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