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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of investments in the VIE (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Securities and other investments owned, at fair value | $ 1,197,587 | $ 1,129,268
Other assets | 45,034 | 45,116
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Securities and other investments owned, at fair value | 35,190 | 33,743
Loans receivable, at fair value | 52,856 | 46,700
Other assets | 2,655 | 3,755
Maximum exposure to loss | $ 90,701 | $ 84,198

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