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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, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Change in unrealized gain (loss) on securities: |  |  |  |  |  |  |  |
Change in net unrealized loss during the period | $ (4,374) |  |  | $ (39,692) |  |  | $ (17,967) | $ (142,980)
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 | 788 |  |  | 1,112 |  |  | 2,341 | 2,111
Net change | (3,586) |  |  | (38,580) |  |  | (14,179) | (140,869)
Tax benefit | (1,062) |  |  | (12,133) |  |  | (1,507) | (44,304)
Net change in unrealized loss on securities, net of reclassification adjustments and tax | (2,524) |  |  | (26,447) |  |  | (12,672) | (96,565)
Change in pension and other postretirement obligations: |  |  |  |  |  |  |  |
Reclassification adjustment for expense included in other expense | (370) |  |  | (935) |  |  | (1,110) | (2,805)
Change in the net actuarial gain | 518 |  |  | 997 |  |  | 1,553 | 2,992
Net change | 148 |  |  | 62 |  |  | 443 | 187
Tax expense | 185 |  |  | 20 |  |  | 272 | 59
Net change in pension and other postretirement obligations | (37) |  |  | 42 |  |  | 171 | 128
Change in unrealized gain (loss) on derivatives: |  |  |  |  |  |  |  |
Change in net unrealized (loss) gain during the period | (246) |  |  | 5,387 |  |  | (771) | 14,548
Reclassification adjustment for expense included in interest expense | 293 |  |  | (546) |  |  | 279 | (569)
Net change | 47 |  |  | 4,841 |  |  | (492) | 13,979
Tax expense (benefit) | 14 |  |  | 1,522 |  |  | (459) | 4,397
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | 33 |  |  | 3,319 |  |  | (33) | 9,582
Total other comprehensive loss, net of tax | $ (2,528) | $ (5,747) | $ (4,259) | $ (23,086) | $ (20,570) | $ (43,199) | $ (12,534) | $ (86,855)

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