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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax $ 912,172 $ 875,297 $ 804,580
Income tax (expense) benefit 52,410 2,492 (17,237)
Ending balance, net of tax 745,997 912,172 875,297
Unrealized Gains (Losses) on Securities      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 84,716 116,078 38,038
Other comprehensive income (loss) before reclassifications (304,859) (37,199) 105,845
Reclassification adjustments included in net income 8,787 (2,499) (7,060)
Income tax (expense) benefit 62,175 8,336 (20,745)
Net current-period other comprehensive income (loss), net of tax (233,897) (31,362) 78,040
Ending balance, net of tax (149,181) 84,716 116,078
Unrealized Gains (Losses) on Derivatives      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (1,257) (17,091) (1,672)
Other comprehensive income (loss) before reclassifications 44,757 13,648 (23,462)
Reclassification adjustments included in net income (3,638) 6,395 3,945
Income tax (expense) benefit (8,635) (4,209) 4,098
Net current-period other comprehensive income (loss), net of tax 32,484 15,834 (15,419)
Ending balance, net of tax 31,227 (1,257) (17,091)
Retirement Plans      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (23,754) (29,907) (32,130)
Other comprehensive income (loss) before reclassifications 4,487 6,524 (215)
Reclassification adjustments included in net income 895 1,264 3,028
Income tax (expense) benefit (1,130) (1,635) (590)
Net current-period other comprehensive income (loss), net of tax 4,252 6,153 2,223
Ending balance, net of tax (19,502) (23,754) (29,907)
Total      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 59,705 69,080 4,236
Other comprehensive income (loss) before reclassifications (255,615) (17,027) 82,168
Reclassification adjustments included in net income 6,044 5,160 (87)
Income tax (expense) benefit 52,410 2,492 (17,237)
Net current-period other comprehensive income (loss), net of tax (197,161) (9,375) 64,844
Ending balance, net of tax $ (137,456) $ 59,705 $ 69,080