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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	21.70%	24.30%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	14.60%	13.20%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	7.40%	8.00%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	7.40%	7.00%
Residential loans | Washington
Concentration Risk [Line Items]
Geographic concentration, percent	5.20%	5.70%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.10%	6.30%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.20%	2.60%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.70%	10.60%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.30%	10.30%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.90%	9.80%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	3.90%	4.00%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Washington
Concentration Risk [Line Items]
Geographic concentration, percent	1.80%	1.80%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.50%	7.40%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	7.20%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	18.00%	19.20%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	11.30%	10.20%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	8.30%	8.60%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	7.30%
Residential loans held in securitization trusts | Washington
Concentration Risk [Line Items]
Geographic concentration, percent	2.60%	2.90%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.60%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.40%	3.20%

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+ References

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