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Residential Loans and Residential Loans Held for Sale, at Fair Value - Schedule of Geographic Concentration of Credit Risk (Details) - Geographic Concentration Risk | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Residential loans | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 14.20% | 23.00%
Residential loans | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.20% | 10.40%
Residential loans | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.20% | 6.60%
Residential loans | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.10% | 8.00%
Residential loans | Pennsylvania |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.10% | 5.10%
Residential loans | Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.90% | 3.60%
Residential loans | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.80% | 6.20%
Residential loans | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.10% | 2.20%
Consolidated SLST | VIE, Primary Beneficiary | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.20% | 11.70%
Consolidated SLST | VIE, Primary Beneficiary | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.70% | 9.10%
Consolidated SLST | VIE, Primary Beneficiary | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.70% | 10.80%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.20% | 6.80%
Consolidated SLST | VIE, Primary Beneficiary | Pennsylvania |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.80% | 3.90%
Consolidated SLST | VIE, Primary Beneficiary | Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.40% | 1.60%
Consolidated SLST | VIE, Primary Beneficiary | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.40% | 4.40%
Consolidated SLST | VIE, Primary Beneficiary | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.40% | 6.30%
Residential loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 16.60% | 20.20%
Residential loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.50% | 12.20%
Residential loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.70% | 6.60%
Residential loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.10% | 5.20%
Residential loans held in securitization trusts | Pennsylvania |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.50% | 3.80%
Residential loans held in securitization trusts | Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 4.00% | 2.00%
Residential loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.00% | 7.90%
Residential loans held in securitization trusts | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 3.30% | 3.10%
Residential Loans Held for Sale | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.80% |
Residential Loans Held for Sale | Pennsylvania |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 12.00% |
Residential Loans Held for Sale | Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 12.50% |
Residential Loans Held for Sale | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.30% |
Residential Loans Held for Sale | Tennessee |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.40% |

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