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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
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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)

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