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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, 2022 | Dec. 31, 2021
Residential loans, at fair value | California |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 24.30% | 21.70%
Residential loans, at fair value | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 13.20% | 10.40%
Residential loans, at fair value | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 8.00% | 8.80%
Residential loans, at fair value | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.00% | 7.40%
Residential loans, at fair value | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 6.30% | 5.90%
Residential loans, at fair value | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.70% | 4.40%
Residential loans, at fair value | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 2.60% | 2.70%
Consolidated SLST | California | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.60% | 10.50%
Consolidated SLST | Florida | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.30% | 10.50%
Consolidated SLST | New York | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 9.80% | 9.80%
Consolidated SLST | Texas | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 4.00% | 4.00%
Consolidated SLST | New Jersey | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.40% | 7.30%
Consolidated SLST | Washington | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 1.80% | 1.90%
Consolidated SLST | Illinois | Consolidated SLST | VIE, Primary Beneficiary |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.20% | 7.10%
Residential mortgage loans held in securitization trust, at fair value | California |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 19.20% | 22.00%
Residential mortgage loans held in securitization trust, at fair value | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.20% | 8.90%
Residential mortgage loans held in securitization trust, at fair value | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 8.60% | 9.20%
Residential mortgage loans held in securitization trust, at fair value | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.30% | 4.30%
Residential mortgage loans held in securitization trust, at fair value | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.60% | 6.40%
Residential mortgage loans held in securitization trust, at fair value | Washington |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 2.90% | 3.10%
Residential mortgage loans held in securitization trust, at fair value | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 3.20% | 2.30%

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