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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 | 9 Months Ended
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Sep. 30, 2021 USD ($)
Concentration Risk [Line Items] |
Principal Balance | $ 23,243
Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 100.00%
California |
Concentration Risk [Line Items] |
Principal Balance | $ 12,219
California | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 52.60%
Illinois |
Concentration Risk [Line Items] |
Principal Balance | $ 3,516
Illinois | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 15.10%
Texas |
Concentration Risk [Line Items] |
Principal Balance | $ 2,456
Texas | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 10.60%
Other |
Concentration Risk [Line Items] |
Principal Balance | $ 5,052
Other | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 21.70%

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