PORTFOLIO LOANS - Schedule of Distribution of Portfolio Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	$ 13,808,619		$ 7,697,087
ACL	(183,334)	$ (195,210)	(83,404)	$ (85,226)	$ (91,562)	$ (91,740)
Portfolio loans, net	13,625,285		7,613,683
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	11,088,431		5,552,288
Commercial loans | C&I and other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	4,476,869		1,904,515
ACL	(68,578)	(89,304)	(21,589)	(20,286)	(26,207)	(21,256)
Commercial loans | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	5,569,759		3,269,564
ACL	(70,935)	(68,478)	(32,301)	(35,104)	(33,505)	(35,465)
Commercial loans | Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	1,041,803		378,209
ACL	(13,072)	(8,689)	(3,345)	(3,722)	(4,713)	(5,163)
Retail loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	2,720,188		2,144,799
Retail loans | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	2,228,959		1,696,457
ACL	(29,042)	(26,399)	(23,711)	(23,729)	(24,281)	(26,298)
Retail loans | Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	491,229		448,342
ACL	$ (1,707)	$ (2,340)	$ (2,458)	$ (2,385)	$ (2,856)	$ (3,558)