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VARIABLE INTEREST ENTITIES - Schedule of Securitization Trusts (Details) - Consolidated VIEs - Commercial Trusts - USD ($) $ in Thousands | Dec. 31, 2019 | Oct. 31, 2019 | Aug. 31, 2019 | Jun. 30, 2018 | Apr. 30, 2015
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Multifamily |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Cut-off Date Principal Balance | $ 394,000 | $ 415,000 | $ 271,700 |  | $ 1,192,607
Face Value of Company’s Variable Interest at Settlement Date | $ 110,350 | 75,359 | $ 20,270 |  | $ 89,446
Hotel |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Cut-off Date Principal Balance |  |  |  | $ 982,000 |
Face Value of Company’s Variable Interest at Settlement Date |  |  |  | $ 93,500 |
Office Building |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Cut-off Date Principal Balance |  | 60,000 |  |  |
Face Value of Company’s Variable Interest at Settlement Date |  | $ 60,000 |  |  |

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