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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