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VARIABLE INTEREST ENTITIES - Geographic Concentrations of Credit Risk Exceeding 5% of Total Loan Unpaid Principal Balances (Details) - Consolidated VIEs - Residential Trusts $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Concentration Risk [Line Items]
Principal Balance	$ 27,685
Securitized Loans | Geographic Concentration Risk
Concentration Risk [Line Items]
% of Balance	100.00%
California
Concentration Risk [Line Items]
Principal Balance	$ 14,222
California | Securitized Loans | Geographic Concentration Risk
Concentration Risk [Line Items]
% of Balance	51.40%
Illinois
Concentration Risk [Line Items]
Principal Balance	$ 3,542
Illinois | Securitized Loans | Geographic Concentration Risk
Concentration Risk [Line Items]
% of Balance	12.80%
Texas
Concentration Risk [Line Items]
Principal Balance	$ 2,938
Texas | Securitized Loans | Geographic Concentration Risk
Concentration Risk [Line Items]
% of Balance	10.60%
Other
Concentration Risk [Line Items]
Principal Balance	$ 6,983
Other | Securitized Loans | Geographic Concentration Risk
Concentration Risk [Line Items]
% of Balance	25.20%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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