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PORTFOLIO LOANS - Distribution of portfolio loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	$ 7,588,077	$ 7,651,034
ACL	(91,562)	(91,740)	$ (91,727)	$ (91,608)
Portfolio loans, net	7,496,515	7,559,294
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	5,606,241	5,635,048
ACL	(64,425)	(61,884)
C&I and other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,828,711	1,835,994
ACL	(26,207)	(21,256)	(24,276)	(23,860)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	3,331,670	3,337,337
ACL	(33,505)	(35,465)	(34,421)	(38,299)
Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	445,860	461,717
ACL	(4,713)	(5,163)	(5,159)	(6,457)
Total retail loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,981,836	2,015,986
ACL	(27,137)	(29,856)
Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,708,663	1,720,455
ACL	(24,281)	(26,298)	(24,255)	(18,193)
Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	273,173	295,531
ACL	$ (2,856)	$ (3,558)	$ (3,616)	$ (4,799)

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

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-Topic 326
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