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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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