SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,411,863	$ 1,271,958
Other comprehensive income/(loss) before reclassifications	40,821	(4,927)
Amounts reclassified from AOCI	(4,794)	(4,092)
Other comprehensive income/(loss) net of tax	36,027	(9,019)
Ending balance	1,480,343	1,292,385
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(40,145)	(50,843)
Other comprehensive income/(loss) net of tax	36,027	(9,019)
Ending balance	(4,118)	(59,862)
AOCI, Securities | Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(68,447)	(115,561)
Other comprehensive income/(loss) before reclassifications	31,565	525
Amounts reclassified from AOCI	(4)	(5)
Other comprehensive income/(loss) net of tax	31,561	520
Ending balance	(36,886)	(115,041)
AOCI, Securities | Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,724)	16,357
Other comprehensive income/(loss) before reclassifications	0	0
Amounts reclassified from AOCI	(500)	(618)
Other comprehensive income/(loss) net of tax	(500)	(618)
Ending balance	(9,224)	15,739
AOCI, Cash Flow Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	37,026	48,361
Other comprehensive income/(loss) before reclassifications	9,256	(5,452)
Amounts reclassified from AOCI	(4,290)	(3,469)
Other comprehensive income/(loss) net of tax	4,966	(8,921)
Ending balance	$ 41,992	$ 39,440