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SHAREHOLDERS’ EQUITY - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,618,233 $ 1,447,412 $ 1,522,263 $ 1,529,116
Ending balance 1,611,880 1,446,218 1,611,880 1,446,218
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (123,465) (108,481) (130,332) 18,777
Net change (44,364) (44,710) (37,497) (171,968)
Transfer from available-for-sale to held-to-maturity       0
Ending balance (167,829) (153,191) (167,829) (153,191)
Net Unrealized Loss on Available-for-Sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (134,533) (123,521) (144,549) 5,271
Net change (41,257) (45,283) (31,241) (173,878)
Transfer from available-for-sale to held-to-maturity       (197)
Ending balance (175,790) (168,804) (175,790) (168,804)
Unamortized Gain (Loss) on Held-to-Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 11,861 14,476 13,185 15,684
Net change (647) (647) (1,971) (2,052)
Transfer from available-for-sale to held-to-maturity       197
Ending balance 11,214 13,829 11,214 13,829
Net Unrealized Gain (Loss) on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (793) 564 1,032 (2,178)
Net change (2,460) 1,220 (4,285) 3,962
Transfer from available-for-sale to held-to-maturity       0
Ending balance $ (3,253) $ 1,784 $ (3,253) $ 1,784