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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax $ 773,288 $ 745,997 $ 912,172
Income tax (expense) benefit 3,040 (6,378) 52,410
Ending balance, net of tax 811,942 773,288 745,997
Unrealized Gains (Losses) on Securities      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (107,499) (149,181) 84,716
Other comprehensive income (loss) before reclassifications (16,686) 28,782 (304,859)
Reclassification adjustments included in net income 10,737 23,980 8,787
Income tax (expense) benefit 1,249 (11,080) 62,175
Net current-period other comprehensive income (loss), net of tax (4,700) 41,682 (233,897)
Ending balance, net of tax (112,199) (107,499) (149,181)
Unrealized Gains (Losses) on Derivatives      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 12,803 31,227 (1,257)
Other comprehensive income (loss) before reclassifications 13,814 1,222 44,757
Reclassification adjustments included in net income (22,042) (24,544) (3,638)
Income tax (expense) benefit 1,728 4,898 (8,635)
Net current-period other comprehensive income (loss), net of tax (6,500) (18,424) 32,484
Ending balance, net of tax 6,303 12,803 31,227
Retirement Plans      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (18,766) (19,502) (23,754)
Other comprehensive income (loss) before reclassifications (928) 176 4,487
Reclassification adjustments included in net income 629 756 895
Income tax (expense) benefit 63 (196) (1,130)
Net current-period other comprehensive income (loss), net of tax (236) 736 4,252
Ending balance, net of tax (19,002) (18,766) (19,502)
Total      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (113,462) (137,456) 59,705
Other comprehensive income (loss) before reclassifications (3,800) 30,180 (255,615)
Reclassification adjustments included in net income (10,676) 192 6,044
Income tax (expense) benefit 3,040 (6,378) 52,410
Net current-period other comprehensive income (loss), net of tax (11,436) 23,994 (197,161)
Ending balance, net of tax $ (124,898) $ (113,462) $ (137,456)