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Residential Loans, at Fair Value - Geographic Concentrations of Credit Risk (Details) - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Residential loans, at fair value | California
Concentration Risk [Line Items]
Geographic concentrations	22.40%	24.30%
Residential loans, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentrations	15.50%	13.20%
Residential loans, at fair value | Texas
Concentration Risk [Line Items]
Geographic concentrations	8.10%	7.00%
Residential loans, at fair value | New York
Concentration Risk [Line Items]
Geographic concentrations	7.00%	8.00%
Residential loans, at fair value | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	4.90%	6.30%
Residential loans, at fair value | Illinois
Concentration Risk [Line Items]
Geographic concentrations	3.00%	2.60%
Residential loans, at fair value | Washington
Concentration Risk [Line Items]
Geographic concentrations	4.30%	5.70%
Consolidated SLST | California | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.70%	10.60%
Consolidated SLST | Florida | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.30%	10.30%
Consolidated SLST | Texas | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	3.90%	4.00%
Consolidated SLST | New York | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.00%	9.80%
Consolidated SLST | New Jersey | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	7.60%	7.40%
Consolidated SLST | Illinois | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	7.20%	7.20%
Consolidated SLST | Washington | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	1.80%	1.80%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentrations	18.40%	19.20%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentrations	11.00%	10.20%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentrations	7.10%	7.30%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentrations	8.50%	8.60%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	6.00%	5.60%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentrations	3.50%	3.20%
Residential loans held in securitization trusts | Washington
Concentration Risk [Line Items]
Geographic concentrations	2.70%	2.90%

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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