PORTFOLIO LOANS - Schedule of Distribution of Portfolio Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	$ 7,998,912		$ 7,651,034
ACL	(85,226)	$ (91,562)	(91,740)	$ (91,639)	$ (91,727)	$ (91,608)
Portfolio loans, net	7,913,686		7,559,294
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	5,799,214		5,635,048
ACL	(59,112)		(61,884)
C&I and other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,942,974		1,835,994
ACL	(20,286)	(26,207)	(21,256)	(24,510)	(24,276)	(23,860)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	3,445,514		3,337,337
ACL	(35,104)	(33,505)	(35,465)	(33,656)	(34,421)	(38,299)
Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	410,726		461,717
ACL	(3,722)	(4,713)	(5,163)	(5,071)	(5,159)	(6,457)
Total retail loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	2,199,698		2,015,986
ACL	(26,114)		(29,856)
Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,727,281		1,720,455
ACL	(23,729)	(24,281)	(26,298)	(24,675)	(24,255)	(18,193)
Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	472,417		295,531
ACL	$ (2,385)	$ (2,856)	$ (3,558)	$ (3,727)	$ (3,616)	$ (4,799)