SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other comprehensive income/(loss):
Other comprehensive income/(loss) before tax	$ 13,542	$ (69,235)	$ 22,500
Provision (Benefit)
Other comprehensive income/(loss), Provision (Benefit)	2,844	(14,539)	4,724
After Tax
Unrealized gains/(losses), after tax	26,888	(53,936)	20,716
Less reclassification adjustments, provision (benefit)	(16,190)	(760)	(2,940)
Other comprehensive income/(loss) net of tax	10,698	(54,696)	17,776
Securities | Available-for-Sale Securities
Other comprehensive income/(loss):
Unrealized gain/(losses), before tax	59,640	(137,500)	11,537
Other comprehensive income/(loss) before tax	59,640	(137,506)	8,867
Provision (Benefit)
Unrealized gains/(losses), provision (benefit)	12,526	(28,876)	2,423
Other comprehensive income/(loss), Provision (Benefit)	12,526	(28,877)	1,862
After Tax
Unrealized gains/(losses), after tax	47,114	(108,624)	9,114
Other comprehensive income/(loss) net of tax	47,114	(108,629)	7,005
Securities | Held-to-Maturity Securities
Other comprehensive income/(loss):
Unrealized gain/(losses), before tax	(31,898)	0	0
Less reclassification adjustments, before tax	148	259	(8,451)
Other comprehensive income/(loss) before tax	(31,750)	259	(8,451)
Provision (Benefit)
Unrealized gains/(losses), provision (benefit)	(6,699)	0	0
Less reclassification adjustments, Provision (Benefit)	30	55	(1,775)
Other comprehensive income/(loss), Provision (Benefit)	(6,669)	55	(1,775)
After Tax
Unrealized gains/(losses), after tax	(25,199)	0	0
Less reclassification adjustments, provision (benefit)	118	204	(6,676)
Other comprehensive income/(loss) net of tax	(25,081)	204	(6,676)
Securities | Net interest income | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	0	0	(2,333)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	0	0	(490)
After Tax
Less reclassification adjustments, provision (benefit)	0	0	(1,843)
Securities | Gain on sale of available-for sale investment securities | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	0	0	(253)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	0	0	(53)
After Tax
Less reclassification adjustments, provision (benefit)	0	0	(200)
Securities | Other income | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	0	(6)	(84)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	0	(1)	(18)
After Tax
Less reclassification adjustments, provision (benefit)	0	(5)	(66)
Cash Flow Hedges
Other comprehensive income/(loss):
Unrealized gain/(losses), before tax	6,295	69,225	14,685
Less reclassification adjustments, before tax	(20,643)	(1,213)	7,399
Other comprehensive income/(loss) before tax	(14,348)	68,012	22,084
Provision (Benefit)
Unrealized gains/(losses), provision (benefit)	1,322	14,537	3,083
Less reclassification adjustments, Provision (Benefit)	(4,335)	(254)	1,554
Other comprehensive income/(loss), Provision (Benefit)	(3,013)	14,283	4,637
After Tax
Unrealized gains/(losses), after tax	4,973	54,688	11,602
Less reclassification adjustments, provision (benefit)	(16,308)	(959)	5,845
Other comprehensive income/(loss) net of tax	(11,335)	53,729	17,447
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income/(loss):
Other comprehensive income/(loss) before tax	13,542	(69,235)	22,500
Provision (Benefit)
Other comprehensive income/(loss), Provision (Benefit)	2,844	(14,539)	4,724
After Tax
Other comprehensive income/(loss) net of tax	$ 10,698	$ (54,696)	$ 17,776