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VARIABLE INTEREST ENTITIES - Geographic Concentrations of Credit Risk Exceeding 5% of Total Loan Unpaid Principal Balances (Details) - Consolidated VIEs $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	$ 3,263,337
Residential Trusts
Concentration Risk [Line Items]
Principal Balance	50,253
California
Concentration Risk [Line Items]
Principal Balance	1,236,527
California | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	22,925
Texas | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	477,642
Texas | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	7,481
New York | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	381,425
Illinois | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	6,504
Florida | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	180,892
Other | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	986,851
Other | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	$ 13,343
Securitized Loans | Geographic Concentration Risk | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	100.00%
Securitized Loans | Geographic Concentration Risk | Residential Trusts
Concentration Risk [Line Items]
% of Balance	100.00%
Securitized Loans | Geographic Concentration Risk | California | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	37.90%
Securitized Loans | Geographic Concentration Risk | California | Residential Trusts
Concentration Risk [Line Items]
% of Balance	45.60%
Securitized Loans | Geographic Concentration Risk | Texas | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	14.60%
Securitized Loans | Geographic Concentration Risk | Texas | Residential Trusts
Concentration Risk [Line Items]
% of Balance	14.90%
Securitized Loans | Geographic Concentration Risk | New York | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	11.70%
Securitized Loans | Geographic Concentration Risk | Illinois | Residential Trusts
Concentration Risk [Line Items]
% of Balance	12.90%
Securitized Loans | Geographic Concentration Risk | Florida | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	5.50%
Securitized Loans | Geographic Concentration Risk | Other | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	30.30%
Securitized Loans | Geographic Concentration Risk | Other | Residential Trusts
Concentration Risk [Line Items]
% of Balance	26.60%

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+ References

No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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