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SHAREHOLDERS’ EQUITY - Pre-tax and After-tax Changes in the Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax [Abstract]        
Change in unrealized gain (loss) on available-for-sale debt securities, before tax $ (55,156) $ (60,539) $ (41,385) $ (232,457)
Change in unrealized gain (loss) on available-for-sale debt securities, tax (13,899) (15,256) (10,429) (58,579)
Change in unrealized gain (loss) on available-for-sale debt securities, after tax (41,257) (45,283) (30,956) (173,878)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent [Abstract]        
Reclassification of gain on sale of available-for-sale securities, before tax     (381) 0
Reclassification of gain on sale of available-for-sale securities, tax     (96) 0
Reclassification of gain on sale of available-for-sale securities, after tax 0 0 (285) 0
Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Tax and Adjustments [Abstract]        
Reclassification of gain on held-to-maturity securities, before tax (865) (865) (2,635) (2,743)
Reclassification of gain on held-to-maturity securities, tax (218) (218) (664) (691)
Reclassification of gain on held-to-maturity securities, after tax (647) (647) (1,971) (2,052)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract]        
Change in unrealized gain (loss) on cash flow hedges arising during the period, before tax (3,588) 1,557 (6,346) 4,615
Change in unrealized gain (loss) on cash flow hedges arising during the period, tax (904) 392 (1,599) 1,164
Change in unrealized gain (loss) on cash flow hedges arising during the period, after tax (2,684) 1,165 (4,747) 3,451
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]        
Reclassification of loss on cash flow hedges, before tax 299 73 616 682
Reclassification of loss on cash flow hedges, tax 75 18 154 171
Reclassification of loss on cash flow hedges, after tax (224) (55) (462) (511)
OCI, Net of Tax [Abstract]        
Total other comprehensive income (loss), before tax (59,310) (59,774) (50,131) (229,903)
Total other comprehensive income (loss), tax (14,946) (15,064) (12,634) (57,935)
Total other comprehensive loss, after-tax $ (44,364) $ (44,710) $ (37,497) $ (171,968)