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Residential Loans, at Fair Value - Geographic Concentrations of Credit Risk (Details) - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Residential loans | California
Concentration Risk [Line Items]
Geographic concentrations	23.00%	22.40%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentrations	10.40%	15.50%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	8.00%	4.90%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentrations	6.60%	7.00%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentrations	6.20%	8.10%
Residential loans | Pennsylvania
Concentration Risk [Line Items]
Geographic concentrations	5.10%	2.20%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentrations	2.20%	3.00%
Consolidated SLST | California
Concentration Risk [Line Items]
Geographic concentrations	11.70%	10.70%
Consolidated SLST | Florida
Concentration Risk [Line Items]
Geographic concentrations	9.10%	10.30%
Consolidated SLST | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	6.80%	7.60%
Consolidated SLST | New York
Concentration Risk [Line Items]
Geographic concentrations	10.80%	10.00%
Consolidated SLST | Texas
Concentration Risk [Line Items]
Geographic concentrations	4.40%	3.90%
Consolidated SLST | Pennsylvania
Concentration Risk [Line Items]
Geographic concentrations	3.90%	4.10%
Consolidated SLST | Illinois
Concentration Risk [Line Items]
Geographic concentrations	6.30%	7.20%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentrations	20.20%	18.40%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentrations	12.20%	11.00%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.20%	6.00%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentrations	6.60%	8.50%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentrations	7.90%	7.10%
Residential loans held in securitization trusts | Pennsylvania
Concentration Risk [Line Items]
Geographic concentrations	3.80%	4.10%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentrations	3.10%	3.50%

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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