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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Residential loans | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 23.40% | 23.90%
Residential loans | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.70% | 9.40%
Residential loans | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.00% | 8.00%
Residential loans | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.60% | 5.40%
Residential loans | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.20% | 5.10%
Residential loans | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.60% | 4.60%
Residential loans | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.50% | 2.80%
Residential loans | Illinois |  |
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 | 15.80% |
Residential loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.40% |
Residential loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.00% |
Residential loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.40% |
Residential loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.00% |
Residential loans held in securitization trusts | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.10% |
Residential loans held in securitization trusts | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.50% |
Residential loans held in securitization trusts | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.20% |
Consolidated SLST | VIE, Primary Beneficiary | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.90% | 11.00%
Consolidated SLST | VIE, Primary Beneficiary | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.50% | 10.60%
Consolidated SLST | VIE, Primary Beneficiary | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.20% | 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 | 7.00% | 6.90%
Consolidated SLST | VIE, Primary Beneficiary | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.80% | 3.80%
Consolidated SLST | VIE, Primary Beneficiary | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.80% | 2.90%
Consolidated SLST | VIE, Primary Beneficiary | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.70% | 6.60%

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