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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	6 Months Ended
	Jun. 30, 2020 USD ($)
Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	$ 3,284,754
Residential Trusts
Concentration Risk [Line Items]
Principal Balance	60,980
California
Concentration Risk [Line Items]
Principal Balance	1,270,544
California | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	27,442
Texas | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	478,457
Texas | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	8,309
New York | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	370,697
Illinois | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	6,534
Florida | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	196,495
Other (1) | Residential Trusts
Concentration Risk [Line Items]
Principal Balance	18,695
Other | Commercial Trusts
Concentration Risk [Line Items]
Principal Balance	968,561
Other | Residential Trusts
Concentration Risk [Line Items]
Principal Balance
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	38.70%
Securitized Loans | Geographic Concentration Risk | California | Residential Trusts
Concentration Risk [Line Items]
% of Balance	45.00%
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	13.60%
Securitized Loans | Geographic Concentration Risk | New York | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	11.30%
Securitized Loans | Geographic Concentration Risk | Illinois | Residential Trusts
Concentration Risk [Line Items]
% of Balance	10.70%
Securitized Loans | Geographic Concentration Risk | Florida | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	6.00%
Securitized Loans | Geographic Concentration Risk | Other (1) | Residential Trusts
Concentration Risk [Line Items]
% of Balance	30.70%
Securitized Loans | Geographic Concentration Risk | Other | Commercial Trusts
Concentration Risk [Line Items]
% of Balance	29.40%
Securitized Loans | Geographic Concentration Risk | Other | Residential Trusts
Concentration Risk [Line Items]
% of Balance

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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