SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Other comprehensive income/(loss):
Other comprehensive (loss)/income before tax	$ (6,359)		$ 32,292		$ 39,245	$ 20,876
Provision (Benefit)
Other comprehensive income/(loss), Provision (Benefit)	(1,336)		6,781		8,241	4,384
After Tax
Unrealized (losses) / gain, after tax	(180)		29,790		40,641	24,863
Less reclassification adjustments, provision (benefit)	(4,843)		(4,279)		(9,637)	(8,371)
Other comprehensive (loss)/income net of tax	(5,023)	$ 36,027	25,511	$ (9,019)	31,004	16,492
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income/(loss):
Other comprehensive (loss)/income before tax	(6,359)		32,292		39,245	20,876
Provision (Benefit)
Other comprehensive income/(loss), Provision (Benefit)	(1,336)		6,781		8,241	4,384
After Tax
Other comprehensive (loss)/income net of tax	(5,023)	$ 36,027	25,511	$ (9,019)	31,004	16,492
Securities | Available-for-Sale Securities
Other comprehensive income/(loss):
Unrealized (losses) / gain, before tax	(4,231)		23,339		35,726	24,003
Other comprehensive (loss)/income before tax	(5,287)		23,334		34,665	23,992
Provision (Benefit)
Unrealized (losses) / gain, provision (benefit)	(889)		4,901		7,503	5,040
Other comprehensive income/(loss), Provision (Benefit)	(1,111)		4,900		7,280	5,038
After Tax
Unrealized (losses) / gain, after tax	(3,342)		18,438		28,223	18,963
Other comprehensive (loss)/income net of tax	(4,176)		18,434		27,385	18,954
Securities | Held-to-Maturity Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	320		(321)		(314)	(1,103)
Other comprehensive (loss)/income before tax	320		(321)		(314)	(1,103)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	68		(68)		(66)	(232)
Other comprehensive income/(loss), Provision (Benefit)	68		(68)		(66)	(232)
After Tax
Less reclassification adjustments, provision (benefit)	252		(253)		(248)	(871)
Other comprehensive (loss)/income net of tax	252		(253)		(248)	(871)
Securities | Gain on sale of available-for sale investment securities | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(1,052)		0		(1,052)	0
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	(221)		0		(221)	0
After Tax
Less reclassification adjustments, provision (benefit)	(831)		0		(831)	0
Securities | Other income | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(4)		(5)		(9)	(11)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	(1)		(1)		(2)	(2)
After Tax
Less reclassification adjustments, provision (benefit)	(3)		(4)		(7)	(9)
Cash Flow Hedges
Other comprehensive income/(loss):
Unrealized (losses) / gain, before tax	4,001		14,370		15,719	7,469
Less reclassification adjustments, before tax	(5,393)		(5,091)		(10,825)	(9,482)
Other comprehensive (loss)/income before tax	(1,392)		9,279		4,894	(2,013)
Provision (Benefit)
Unrealized (losses) / gain, provision (benefit)	839		3,018		3,301	1,569
Less reclassification adjustments, Provision (Benefit)	(1,132)		(1,069)		(2,274)	(1,991)
Other comprehensive income/(loss), Provision (Benefit)	(293)		1,949		1,027	(422)
After Tax
Unrealized (losses) / gain, after tax	3,162		11,352		12,418	5,900
Less reclassification adjustments, provision (benefit)	(4,261)		(4,022)		(8,551)	(7,491)
Other comprehensive (loss)/income net of tax	$ (1,099)		$ 7,330		$ 3,867	$ (1,591)