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
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