v3.26.3
Residential Loans and Residential Loans Held for Sale, at Fair Value - Schedule of Geographic Concentration of Credit Risk of Residential Loans (Details) - Geographic Concentration Risk
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Residential loans | California    
Concentration Risk [Line Items]    
Geographic concentration, percent 11.80% 3.40%
Residential loans | Florida    
Concentration Risk [Line Items]    
Geographic concentration, percent 8.50% 7.00%
Residential loans | New Jersey    
Concentration Risk [Line Items]    
Geographic concentration, percent 8.20% 8.90%
Residential loans | Texas    
Concentration Risk [Line Items]    
Geographic concentration, percent 8.00% 5.20%
Residential loans | Pennsylvania    
Concentration Risk [Line Items]    
Geographic concentration, percent 7.00% 10.10%
Residential loans | Ohio    
Concentration Risk [Line Items]    
Geographic concentration, percent 5.10% 10.70%
Residential loans | Illinois    
Concentration Risk [Line Items]    
Geographic concentration, percent 4.90% 3.60%
Residential loans | New York    
Concentration Risk [Line Items]    
Geographic concentration, percent 4.30% 6.70%
Consolidated SLST | VIE, Primary Beneficiary | California    
Concentration Risk [Line Items]    
Geographic concentration, percent 11.30% 11.20%
Consolidated SLST | VIE, Primary Beneficiary | Florida    
Concentration Risk [Line Items]    
Geographic concentration, percent 8.60% 8.60%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey    
Concentration Risk [Line Items]    
Geographic concentration, percent 6.30% 6.30%
Consolidated SLST | VIE, Primary Beneficiary | Texas    
Concentration Risk [Line Items]    
Geographic concentration, percent 4.40% 4.40%
Consolidated SLST | VIE, Primary Beneficiary | Pennsylvania    
Concentration Risk [Line Items]    
Geographic concentration, percent 3.80% 3.80%
Consolidated SLST | VIE, Primary Beneficiary | Ohio    
Concentration Risk [Line Items]    
Geographic concentration, percent 3.40% 3.50%
Consolidated SLST | VIE, Primary Beneficiary | Illinois    
Concentration Risk [Line Items]    
Geographic concentration, percent 7.40% 7.40%
Consolidated SLST | VIE, Primary Beneficiary | New York    
Concentration Risk [Line Items]    
Geographic concentration, percent 10.90% 10.70%
Residential loans held in securitization trusts | California    
Concentration Risk [Line Items]    
Geographic concentration, percent 8.00% 16.80%
Residential loans held in securitization trusts | Florida    
Concentration Risk [Line Items]    
Geographic concentration, percent 7.00% 10.10%
Residential loans held in securitization trusts | New Jersey    
Concentration Risk [Line Items]    
Geographic concentration, percent 7.40% 6.40%
Residential loans held in securitization trusts | Texas    
Concentration Risk [Line Items]    
Geographic concentration, percent 6.20% 6.70%
Residential loans held in securitization trusts | Pennsylvania    
Concentration Risk [Line Items]    
Geographic concentration, percent 8.40% 5.50%
Residential loans held in securitization trusts | Ohio    
Concentration Risk [Line Items]    
Geographic concentration, percent 7.50% 3.90%
Residential loans held in securitization trusts | Illinois    
Concentration Risk [Line Items]    
Geographic concentration, percent 3.30% 3.30%
Residential loans held in securitization trusts | New York    
Concentration Risk [Line Items]    
Geographic concentration, percent 7.20% 6.60%