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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Participating Mortgage Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jul. 25, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid principal balance | $ 6,953,895 |  | $ 7,107,897
Unamortized net premiums | 16,571 |  | 18,319
Unamortized net deferred (fees) costs | (1,331) |  | (1,880)
Fair value adjustment | (8,103) |  | (9,298)
Loans receivable, net | 6,961,032 |  | 7,115,038
Banc of California, NA |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Contingent forward asset sale |  | $ 1,800,000 |
PMB Acquisition |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Fair value adjustment | (7,100) |  | (8,000)
PMB Acquisition | PCD loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Fair value adjustment | $ (3,600) |  | $ (4,100)

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