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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Change in unrealized gain (loss) on securities: |  |  |  |  |  |
Change in net unrealized gain (loss) during the period | $ 3,775 |  | $ (11,291) |  | $ 7,119 | $ (13,593)
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 | 818 |  | 796 |  | 1,536 | 1,553
Net change | 4,593 |  | (10,495) |  | 8,655 | (10,593)
Tax expense (benefit) | 1,634 |  | (3,109) |  | 2,846 | (445)
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | 2,959 |  | (7,386) |  | 5,809 | (10,148)
Change in pension and other postretirement obligations: |  |  |  |  |  |
Reclassification adjustment for expense included in other expense | (318) |  | (370) |  | (635) | (740)
Change in the net actuarial gain | 520 |  | 814 |  | 1,040 | 1,035
Net change | 202 |  | 444 |  | 405 | 295
Tax expense (benefit) | 77 |  | 131 |  | 135 | 87
Net change in pension and other postretirement obligations | 125 |  | 313 |  | 270 | 208
Change in unrealized gain (loss) on derivatives: |  |  |  |  |  |
Change in net unrealized (loss) gain during the period | (3,128) |  | 1,586 |  | (983) | (525)
Reclassification adjustment for expense included in interest expense | 2,520 |  | 299 |  | 4,955 | (14)
Net change | (608) |  | 1,885 |  | 3,972 | (539)
Tax expense (benefit) | (210) |  | 559 |  | 1,252 | (473)
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | (398) |  | 1,326 |  | 2,720 | (66)
Total other comprehensive income (loss), net of tax | $ 2,686 | $ 6,113 | $ (5,747) | $ (4,259) | $ 8,799 | $ (10,006)

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