PORTFOLIO LOANS - Distribution of portfolio loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 7,725,702	$ 7,188,998
ACL	(91,608)	(87,887)	$ (101,048)	$ (53,748)
Portfolio loans, net	7,634,094	7,101,111
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,974,154	1,943,886
ACL	(23,860)	(23,855)	(23,866)	(18,291)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	3,261,873	3,119,807
ACL	(38,299)	(38,249)	(46,230)	(21,190)
Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	530,469	385,996
ACL	(6,457)	(5,102)	(8,193)	(3,204)
Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,657,082	1,512,976
ACL	(18,193)	(17,589)	(21,992)	(10,495)
Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	302,124	226,333
ACL	$ (4,799)	$ (3,092)	$ (767)	$ (568)