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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance, net of tax | $ 745,997 | $ 912,172 | $ 875,297
Income tax (expense) benefit | (6,378) | 52,410 | 2,492
Ending balance, net of tax | 773,288 | 745,997 | 912,172
Unrealized Gains (Losses) on Securities |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance, net of tax | (149,181) | 84,716 | 116,078
Other comprehensive income (loss) before reclassifications | 28,782 | (304,859) | (37,199)
Reclassification adjustments included in net income | 23,980 | 8,787 | (2,499)
Income tax (expense) benefit | (11,080) | 62,175 | 8,336
Net current-period other comprehensive income (loss), net of tax | 41,682 | (233,897) | (31,362)
Ending balance, net of tax | (107,499) | (149,181) | 84,716
Unrealized Gains (Losses) on Derivatives |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance, net of tax | 31,227 | (1,257) | (17,091)
Other comprehensive income (loss) before reclassifications | 1,222 | 44,757 | 13,648
Reclassification adjustments included in net income | (24,544) | (3,638) | 6,395
Income tax (expense) benefit | 4,898 | (8,635) | (4,209)
Net current-period other comprehensive income (loss), net of tax | (18,424) | 32,484 | 15,834
Ending balance, net of tax | 12,803 | 31,227 | (1,257)
Retirement Plans |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance, net of tax | (19,502) | (23,754) | (29,907)
Other comprehensive income (loss) before reclassifications | 176 | 4,487 | 6,524
Reclassification adjustments included in net income | 756 | 895 | 1,264
Income tax (expense) benefit | (196) | (1,130) | (1,635)
Net current-period other comprehensive income (loss), net of tax | 736 | 4,252 | 6,153
Ending balance, net of tax | (18,766) | (19,502) | (23,754)
Total |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance, net of tax | (137,456) | 59,705 | 69,080
Other comprehensive income (loss) before reclassifications | 30,180 | (255,615) | (17,027)
Reclassification adjustments included in net income | 192 | 6,044 | 5,160
Income tax (expense) benefit | (6,378) | 52,410 | 2,492
Net current-period other comprehensive income (loss), net of tax | 23,994 | (197,161) | (9,375)
Ending balance, net of tax | $ (113,462) | $ (137,456) | $ 59,705

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