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PORTFOLIO LOANS - Schedule of Distribution of Portfolio Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | $ 7,809,097 |  | $ 7,651,034 |  |  |
ACL | (84,981) | $ (85,226) | (91,740) | $ (91,710) | $ (91,639) | $ (91,608)
Portfolio loans, net | 7,724,116 |  | 7,559,294 |  |  |
Commercial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 5,631,281 |  | 5,635,048 |  |  |
ACL | (58,515) |  | (61,884) |  |  |
Commercial loans | C&I and other commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 1,877,497 |  | 1,835,994 |  |  |
ACL | (21,009) | (20,286) | (21,256) | (22,633) | (24,510) | (23,860)
Commercial loans | Commercial and Retail Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 3,355,807 |  | 3,337,337 |  |  |
ACL | (33,735) | (35,104) | (35,465) | (34,691) | (33,656) | (38,299)
Commercial loans | Real estate construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 397,977 |  | 461,717 |  |  |
ACL | (3,771) | (3,722) | (5,163) | (5,206) | (5,071) | (6,457)
Retail loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 2,177,816 |  | 2,015,986 |  |  |
ACL | (26,466) |  | (29,856) |  |  |
Retail loans | Commercial and Retail Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 1,708,771 |  | 1,720,455 |  |  |
ACL | (23,979) | (23,729) | (26,298) | (25,333) | (24,675) | (18,193)
Retail loans | Retail other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 469,045 |  | 295,531 |  |  |
ACL | $ (2,487) | $ (2,385) | $ (3,558) | $ (3,847) | $ (3,727) | $ (4,799)

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