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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 | 3 Months Ended
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Mar. 31, 2021 USD ($)
Concentration Risk [Line Items] |
Principal Balance | $ 36,034
Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 100.00%
California |
Concentration Risk [Line Items] |
Principal Balance | $ 16,549
California | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 45.90%
Illinois |
Concentration Risk [Line Items] |
Principal Balance | $ 4,799
Illinois | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 13.30%
Texas |
Concentration Risk [Line Items] |
Principal Balance | $ 4,365
Texas | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 12.10%
Massachusetts |
Concentration Risk [Line Items] |
Principal Balance | $ 2,247
Massachusetts | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 6.20%
Other |
Concentration Risk [Line Items] |
Principal Balance | $ 8,074
Other | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 22.50%

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