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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Residential loans | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 21.70% | 24.30%
Residential loans | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 14.60% | 13.20%
Residential loans | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.40% | 8.00%
Residential loans | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.40% | 7.00%
Residential loans | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.20% | 5.70%
Residential loans | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.10% | 6.30%
Residential loans | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.20% | 2.60%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.70% | 10.60%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.30% | 10.30%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.90% | 9.80%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.90% | 4.00%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 1.80% | 1.80%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.50% | 7.40%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.20% | 7.20%
Residential loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 18.00% | 19.20%
Residential loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.30% | 10.20%
Residential loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.30% | 8.60%
Residential loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.20% | 7.30%
Residential loans held in securitization trusts | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 2.60% | 2.90%
Residential loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.60% | 5.60%
Residential loans held in securitization trusts | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.40% | 3.20%

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