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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Residential loans | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 21.70% | 23.90%
Residential loans | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.20% | 9.40%
Residential loans | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.50% | 8.00%
Residential loans | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.50% | 5.40%
Residential loans | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.90% | 5.10%
Residential loans | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.50% | 4.60%
Residential loans | ILLINOIS |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.70% | 2.80%
Residential loans | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.70% | 2.80%
Residential loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 1.60% |
Residential loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 12.40% |
Residential loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 35.80% |
Residential loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 0.00% |
Residential loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 13.10% |
Residential loans held in securitization trusts | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.00% |
Residential loans held in securitization trusts | ILLINOIS |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 0.00% |
Residential loans held in securitization trusts | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 17.70% |
Consolidated SLST | VIE, Primary Beneficiary | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.10% | 11.00%
Consolidated SLST | VIE, Primary Beneficiary | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.60% | 10.60%
Consolidated SLST | VIE, Primary Beneficiary | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.10% | 9.10%
Consolidated SLST | VIE, Primary Beneficiary | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.00% | 4.00%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.90% | 6.90%
Consolidated SLST | VIE, Primary Beneficiary | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.80% | 3.80%
Consolidated SLST | VIE, Primary Beneficiary | ILLINOIS |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.60% | 6.60%
Consolidated SLST | VIE, Primary Beneficiary | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.90% | 2.90%

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