SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 1,854,434	$ 1,717,021	$ 1,718,949	$ 1,544,307	$ 1,525,646	$ 1,489,026	$ 1,718,949	$ 1,489,026
Other comprehensive (loss)/income before reclassifications	(50,076)			15,221			(78,161)	15,703
Amounts reclassified from AOCI	44			(2,987)			(3,487)	(8,987)
Other comprehensive (loss)/income net of tax	(50,032)	(3,163)	(28,453)	12,234	(15,857)	10,339	(81,648)	6,716
Ending Balance	1,842,645	1,854,434	1,717,021	1,687,083	1,544,307	1,525,646	1,842,645	1,687,083
Accumulated Other comprehensive (loss)/ income:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(18,234)	(15,071)	13,382	(17,665)	(1,808)	(12,147)	13,382	(12,147)
Other comprehensive (loss)/income net of tax	(50,032)	(3,163)	(28,453)	12,234	(15,857)	10,339
Ending Balance	(68,266)	(18,234)	(15,071)	(5,431)	(17,665)	(1,808)	(68,266)	(5,431)
Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(29,819)		2,811	(32,113)		(37,575)	2,811	(37,575)
Other comprehensive (loss)/income before reclassifications	(53,862)			14,912			(86,489)	20,379
Amounts reclassified from AOCI	(2)			(2)			(5)	(7)
Other comprehensive (loss)/income net of tax	(53,864)			14,910			(86,494)	20,372
Ending Balance	(83,683)	(29,819)		(17,203)	(32,113)		(83,683)	(17,203)
Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(8,879)		(9,246)	(9,240)		(9,226)	(9,246)	(9,226)
Other comprehensive (loss)/income before reclassifications	0			0			0	0
Amounts reclassified from AOCI	46			(147)			413	(161)
Other comprehensive (loss)/income net of tax	46			(147)			413	(161)
Ending Balance	(8,833)	(8,879)		(9,387)	(9,240)		(8,833)	(9,387)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	20,464		$ 19,817	23,688		$ 34,654	19,817	34,654
Other comprehensive (loss)/income before reclassifications	3,786			309			8,328	(4,676)
Amounts reclassified from AOCI	0			(2,838)			(3,895)	(8,819)
Other comprehensive (loss)/income net of tax	3,786			(2,529)			4,433	(13,495)
Ending Balance	$ 24,250	$ 20,464		$ 21,159	$ 23,688		$ 24,250	$ 21,159