SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other comprehensive income/(loss):
Other comprehensive income/(loss) before tax	$ 45,604	$ (11,416)
Provision (Benefit)
Other comprehensive income/(loss), Provision (Benefit)	9,577	(2,397)
After Tax
Unrealized gains/(losses), after tax	40,821	(4,927)
Less reclassification adjustments, provision (benefit)	(4,794)	(4,092)
Other comprehensive income/(loss) net of tax	36,027	(9,019)
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income/(loss):
Other comprehensive income/(loss) before tax	45,604	(11,416)
Provision (Benefit)
Other comprehensive income/(loss), Provision (Benefit)	9,577	(2,397)
After Tax
Other comprehensive income/(loss) net of tax	36,027	(9,019)
Securities | Available-for-Sale Securities
Other comprehensive income/(loss):
Unrealized gain/(losses), before tax	39,957	664
Other comprehensive income/(loss) before tax	39,952	658
Provision (Benefit)
Unrealized gains/(losses), provision (benefit)	8,392	139
Other comprehensive income/(loss), Provision (Benefit)	8,391	138
After Tax
Unrealized gains/(losses), after tax	31,565	525
Other comprehensive income/(loss) net of tax	31,561	520
Securities | Held-to-Maturity Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(634)	(782)
Other comprehensive income/(loss) before tax	(634)	(782)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	(134)	(164)
Other comprehensive income/(loss), Provision (Benefit)	(134)	(164)
After Tax
Less reclassification adjustments, provision (benefit)	(500)	(618)
Other comprehensive income/(loss) net of tax	(500)	(618)
Securities | Other income | Available-for-Sale Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(5)	(6)
Provision (Benefit)
Less reclassification adjustments, Provision (Benefit)	(1)	(1)
After Tax
Less reclassification adjustments, provision (benefit)	(4)	(5)
Cash Flow Hedges
Other comprehensive income/(loss):
Unrealized gain/(losses), before tax	11,717	(6,901)
Less reclassification adjustments, before tax	(5,431)	(4,391)
Other comprehensive income/(loss) before tax	6,286	(11,292)
Provision (Benefit)
Unrealized gains/(losses), provision (benefit)	2,461	(1,449)
Less reclassification adjustments, Provision (Benefit)	(1,141)	(922)
Other comprehensive income/(loss), Provision (Benefit)	1,320	(2,371)
After Tax
Unrealized gains/(losses), after tax	9,256	(5,452)
Less reclassification adjustments, provision (benefit)	(4,290)	(3,469)
Other comprehensive income/(loss) net of tax	$ 4,966	$ (8,921)