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, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Other comprehensive income/(loss):
Other comprehensive (loss)/income before tax	$ (20,072)		$ (6,359)		$ (6,984)	$ 39,245
Provision (Benefit)
Other comprehensive income/(loss), provision (benefit)	(4,215)		(1,336)		(1,466)	8,241
After Tax
Other comprehensive (loss)/income before reclassifications	(13,121)		(180)		482	40,641
Less reclassification adjustments, provision (benefit)	(2,736)		(4,843)		(6,000)	(9,637)
Other comprehensive (loss)/income net of tax	(15,857)	$ 10,339	(5,023)	$ 36,027	(5,518)	31,004
Available-for-Sale Securities
Other comprehensive income/(loss):
Unrealized (losses) / gain, before tax	(14,844)		(4,231)		6,921	35,726
Other comprehensive (loss)/income before tax	(14,847)		(5,287)		6,915	34,665
Provision (Benefit)
Unrealized (losses) / gain, provision (benefit)	(3,117)		(889)		1,454	7,503
Other comprehensive income/(loss), provision (benefit)	(3,118)		(1,111)		1,453	7,280
After Tax
Other comprehensive (loss)/income before reclassifications	(11,727)		(3,342)		5,467	28,223
Less reclassification adjustments, provision (benefit)	(2)		(834)		(5)	(838)
Other comprehensive (loss)/income net of tax	(11,729)		(4,176)		5,462	27,385
Available-for-Sale Securities | Gain on sale of available-for sale investment securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	0		(1,052)		0	(1,052)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	0		(221)		0	(221)
After Tax
Less reclassification adjustments, provision (benefit)	0		(831)		0	(831)
Available-for-Sale Securities | Other income
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(3)		(4)		(6)	(9)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	(1)		(1)		(1)	(2)
After Tax
Less reclassification adjustments, provision (benefit)	(2)		(3)		(5)	(7)
Held-to-Maturity Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	285		320		(18)	(314)
Other comprehensive (loss)/income before tax	285		320		(18)	(314)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	60		68		(4)	(66)
Other comprehensive income/(loss), provision (benefit)	60		68		(4)	(66)
After Tax
Other comprehensive (loss)/income before reclassifications	0		0		0	0
Less reclassification adjustments, provision (benefit)	225		252		(14)	(248)
Other comprehensive (loss)/income net of tax	225		252		(14)	(248)
Cash Flow Hedges
Other comprehensive income/(loss):
Unrealized (losses) / gain, before tax	(1,764)		4,001		(6,310)	15,719
Less reclassification adjustments, before tax	(3,746)		(5,393)		(7,571)	(10,825)
Other comprehensive (loss)/income before tax	(5,510)		(1,392)		(13,881)	4,894
Provision (Benefit)
Unrealized (losses) / gain, provision (benefit)	(370)		839		(1,325)	3,301
Less reclassification adjustments, provision (benefit)	(787)		(1,132)		(1,590)	(2,274)
Other comprehensive income/(loss), provision (benefit)	(1,157)		(293)		(2,915)	1,027
After Tax
Other comprehensive (loss)/income before reclassifications	(1,394)		3,162		(4,985)	12,418
Less reclassification adjustments, provision (benefit)	(2,959)		(4,261)		(5,981)	(8,551)
Other comprehensive (loss)/income net of tax	$ (4,353)		$ (1,099)		$ (10,966)	$ 3,867