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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Consolidated SLST | VIE, Primary Beneficiary | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.80% | 10.90%
Consolidated SLST | VIE, Primary Beneficiary | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.50% | 10.50%
Consolidated SLST | VIE, Primary Beneficiary | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.30% | 9.30%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.20% | 7.10%
Consolidated SLST | VIE, Primary Beneficiary | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.00% | 4.00%
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 | 6.80% | 6.80%
Residential loans | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 24.50% | 23.60%
Residential loans | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 12.80% | 13.10%
Residential loans | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.70% | 9.20%
Residential loans | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.20% | 5.60%
Residential loans | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.40% | 5.60%
Residential loans | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.70% | 2.80%
Residential loans | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.40% | 2.50%
Residential loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 19.60% | 19.80%
Residential loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.10% | 8.10%
Residential loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.20% | 8.90%
Residential loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.70% | 5.60%
Residential loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.40% | 4.30%
Residential loans held in securitization trusts | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.10% | 6.30%
Residential loans held in securitization trusts | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.50% | 2.70%

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