PORTFOLIO LOANS - Schedule of Distribution of Portfolio Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	$ 13,195,154		$ 13,567,799
ACL	(164,204)	$ (169,054)	(174,023)	$ (183,334)	$ (195,210)	$ (83,404)
Portfolio loans, net	13,030,950		13,393,776
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	10,439,847		10,818,515
Commercial loans \| C&I and other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	3,959,997		4,229,208
ACL	(57,419)	(57,804)	(61,370)	(68,578)	(89,304)	(21,589)
Commercial loans \| CRE and Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	5,452,781		5,550,018
ACL	(63,183)	(70,100)	(70,328)	(70,935)	(68,478)	(32,301)
Commercial loans \| Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	1,027,069		1,039,289
ACL	(14,855)	(12,588)	(11,568)	(13,072)	(8,689)	(3,345)
Retail loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	2,755,307		2,749,284
Retail loans \| CRE and Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	2,116,360		2,154,616
ACL	(27,216)	(27,140)	(29,178)	(29,042)	(26,399)	(23,711)
Retail loans \| Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	638,947		594,668
ACL	$ (1,531)	$ (1,422)	$ (1,579)	$ (1,707)	$ (2,340)	$ (2,458)