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Residential Loans, at Fair Value - Schedule of Geographic Concentration of Credit Risk (Details) - Geographic Concentration Risk	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	17.00%	23.00%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	12.10%	10.40%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	10.70%	6.60%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	6.70%	6.20%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.20%	8.00%
Residential loans | Pennsylvania
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.10%
Residential loans | Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	5.10%	3.60%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.50%	2.20%
Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	11.10%	11.70%
Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	8.80%	9.10%
Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	10.80%
Consolidated SLST | VIE, Primary Beneficiary | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.40%	4.40%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.30%	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 | 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	17.40%	20.20%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	12.00%	12.20%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	6.60%	6.60%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	7.10%	7.90%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.70%	5.20%
Residential loans held in securitization trusts | Pennsylvania
Concentration Risk [Line Items]
Geographic concentration, percent	4.80%	3.80%
Residential loans held in securitization trusts | Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	2.70%	2.00%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.20%	3.10%

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