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Residential Loans, at Fair Value - Geographic Concentrations of Credit Risk (Details) - Geographic Concentration Risk | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Residential loans, at fair value | California |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 22.40% | 24.30%
Residential loans, at fair value | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 15.50% | 13.20%
Residential loans, at fair value | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 8.10% | 7.00%
Residential loans, at fair value | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.00% | 8.00%
Residential loans, at fair value | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 4.90% | 6.30%
Residential loans, at fair value | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 3.00% | 2.60%
Residential loans, at fair value | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 4.30% | 5.70%
Consolidated SLST | California | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.70% | 10.60%
Consolidated SLST | Florida | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.30% | 10.30%
Consolidated SLST | Texas | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 3.90% | 4.00%
Consolidated SLST | New York | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.00% | 9.80%
Consolidated SLST | New Jersey | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.60% | 7.40%
Consolidated SLST | Illinois | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.20% | 7.20%
Consolidated SLST | Washington | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 1.80% | 1.80%
Residential loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 18.40% | 19.20%
Residential loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 11.00% | 10.20%
Residential loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.10% | 7.30%
Residential loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 8.50% | 8.60%
Residential loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 6.00% | 5.60%
Residential loans held in securitization trusts | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 3.50% | 3.20%
Residential loans held in securitization trusts | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 2.70% | 2.90%

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