SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Other comprehensive income/(loss):
Other comprehensive income before tax	$ 13,088	$ 45,604
Provision (Benefit)
Other comprehensive income/(loss), provision (benefit)	2,749	9,577
After Tax
Unrealized (losses) / gain, after tax	13,603	40,821
Less reclassification adjustments, provision (benefit)	(3,264)	(4,794)
Other comprehensive income net of tax	10,339	36,027
Accumulated Other Comprehensive Loss
Other comprehensive income/(loss):
Other comprehensive income before tax	13,088	45,604
Provision (Benefit)
Other comprehensive income/(loss), provision (benefit)	2,749	9,577
After Tax
Other comprehensive income net of tax	10,339	36,027
Securities | Available-for-Sale Securities
Other comprehensive income/(loss):
Unrealized (losses) / gain, before tax	21,766	39,957
Other comprehensive income before tax	21,762	39,952
Provision (Benefit)
Unrealized (losses) / gain, provision (benefit)	4,572	8,392
Other comprehensive income/(loss), provision (benefit)	4,571	8,391
After Tax
Unrealized (losses) / gain, after tax	17,194	31,565
Other comprehensive income net of tax	17,191	31,561
Securities | Held-to-Maturity Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(303)	(634)
Other comprehensive income before tax	(303)	(634)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	(64)	(134)
Other comprehensive income/(loss), provision (benefit)	(64)	(134)
After Tax
Less reclassification adjustments, provision (benefit)	(239)	(500)
Other comprehensive income net of tax	(239)	(500)
Securities | Other income | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(4)	(5)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	(1)	(1)
After Tax
Less reclassification adjustments, provision (benefit)	(3)	(4)
Cash Flow Hedges
Other comprehensive income/(loss):
Unrealized (losses) / gain, before tax	(4,546)	11,717
Less reclassification adjustments, before tax	(3,825)	(5,431)
Other comprehensive income before tax	(8,371)	6,286
Provision (Benefit)
Unrealized (losses) / gain, provision (benefit)	(955)	2,461
Less reclassification adjustments, provision (benefit)	(803)	(1,141)
Other comprehensive income/(loss), provision (benefit)	(1,758)	1,320
After Tax
Unrealized (losses) / gain, after tax	(3,591)	9,256
Less reclassification adjustments, provision (benefit)	(3,022)	(4,290)
Other comprehensive income net of tax	$ (6,613)	$ 4,966