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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, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Change in unrealized gain (loss) on securities: |  |  |  |  |  |  |  |
Change in net unrealized gain (loss) during the period | $ 25,135 |  |  | $ (4,374) |  |  | $ 32,254 | $ (17,967)
Reclassification adjustment for net losses included in net loss on sale of securities and other assets |  |  |  |  |  |  |  | 1,447
Accretion of net unrealized loss on securities transferred to held-to-maturity | 765 |  |  | 788 |  |  | 2,301 | 2,341
Net change | 25,900 |  |  | (3,586) |  |  | 34,555 | (14,179)
Tax expense (benefit) | 8,200 |  |  | (1,062) |  |  | 11,046 | (1,507)
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | 17,700 |  |  | (2,524) |  |  | 23,509 | (12,672)
Change in pension and other postretirement obligations: |  |  |  |  |  |  |  |
Reclassification adjustment for expense included in other expense | (317) |  |  | (370) |  |  | (952) | (1,110)
Change in the net actuarial gain | 520 |  |  | 518 |  |  | 1,560 | 1,553
Net change | 203 |  |  | 148 |  |  | 608 | 443
Tax expense | 65 |  |  | 185 |  |  | 200 | 272
Net change in pension and other postretirement obligations | 138 |  |  | (37) |  |  | 408 | 171
Change in unrealized gain (loss) on derivatives: |  |  |  |  |  |  |  |
Change in net unrealized loss during the period | (14,500) |  |  | (246) |  |  | (15,483) | (771)
Reclassification adjustment for expense included in interest expense | 2,752 |  |  | 293 |  |  | 7,707 | 279
Net change | (11,748) |  |  | 47 |  |  | (7,776) | (492)
Tax expense (benefit) | (3,720) |  |  | 14 |  |  | (2,468) | (459)
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | (8,028) |  |  | 33 |  |  | (5,308) | (33)
Total other comprehensive income (loss), net of tax | $ 9,810 | $ 2,686 | $ 6,113 | $ (2,528) | $ (5,747) | $ (4,259) | $ 18,609 | $ (12,534)

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