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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 | 3 Months Ended
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Mar. 31, 2019 USD ($)
Commercial Trusts |
Concentration Risk [Line Items] |
Principal Balance | $ 3,050,513
Commercial Trusts | Texas |
Concentration Risk [Line Items] |
Principal Balance | 546,190
Commercial Trusts | California |
Concentration Risk [Line Items] |
Principal Balance | 461,478
Commercial Trusts | Maryland |
Concentration Risk [Line Items] |
Principal Balance | 407,266
Commercial Trusts | Maryland |
Concentration Risk [Line Items] |
Principal Balance | 349,921
Commercial Trusts | Pennsylvania |
Concentration Risk [Line Items] |
Principal Balance | 280,201
Commercial Trusts | Other |
Concentration Risk [Line Items] |
Principal Balance | $ 1,005,457
Commercial Trusts | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 100.00%
Commercial Trusts | Securitized Loans | Geographic Concentration Risk | Texas |
Concentration Risk [Line Items] |
% of Balance | 17.90%
Commercial Trusts | Securitized Loans | Geographic Concentration Risk | California |
Concentration Risk [Line Items] |
% of Balance | 15.10%
Commercial Trusts | Securitized Loans | Geographic Concentration Risk | Maryland |
Concentration Risk [Line Items] |
% of Balance | 13.40%
Commercial Trusts | Securitized Loans | Geographic Concentration Risk | Maryland |
Concentration Risk [Line Items] |
% of Balance | 11.50%
Commercial Trusts | Securitized Loans | Geographic Concentration Risk | Pennsylvania |
Concentration Risk [Line Items] |
% of Balance | 9.20%
Commercial Trusts | Securitized Loans | Geographic Concentration Risk | Other |
Concentration Risk [Line Items] |
% of Balance | 32.90%
Residential Trusts |
Concentration Risk [Line Items] |
Principal Balance | $ 101,267
Residential Trusts | Texas |
Concentration Risk [Line Items] |
Principal Balance | 13,261
Residential Trusts | California |
Concentration Risk [Line Items] |
Principal Balance | 45,023
Residential Trusts | Other |
Concentration Risk [Line Items] |
Principal Balance | 23,155
Residential Trusts | Washington |
Concentration Risk [Line Items] |
Principal Balance | 7,466
Residential Trusts | Illinois |
Concentration Risk [Line Items] |
Principal Balance | 7,197
Residential Trusts | Florida |
Concentration Risk [Line Items] |
Principal Balance | $ 5,165
Residential Trusts | Securitized Loans | Geographic Concentration Risk |
Concentration Risk [Line Items] |
% of Balance | 100.00%
Residential Trusts | Securitized Loans | Geographic Concentration Risk | Texas |
Concentration Risk [Line Items] |
% of Balance | 13.10%
Residential Trusts | Securitized Loans | Geographic Concentration Risk | California |
Concentration Risk [Line Items] |
% of Balance | 44.50%
Residential Trusts | Securitized Loans | Geographic Concentration Risk | Other |
Concentration Risk [Line Items] |
% of Balance | 22.80%
Residential Trusts | Securitized Loans | Geographic Concentration Risk | Washington |
Concentration Risk [Line Items] |
% of Balance | 7.40%
Residential Trusts | Securitized Loans | Geographic Concentration Risk | Illinois |
Concentration Risk [Line Items] |
% of Balance | 7.10%
Residential Trusts | Securitized Loans | Geographic Concentration Risk | Florida |
Concentration Risk [Line Items] |
% of Balance | 5.10%

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