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Residential Loans, at Fair Value - Geographic Concentrations of Credit Risk (Details) - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Residential loans, at fair value | California
Concentration Risk [Line Items]
Geographic concentrations	24.30%	21.70%
Residential loans, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentrations	13.20%	10.40%
Residential loans, at fair value | New York
Concentration Risk [Line Items]
Geographic concentrations	8.00%	8.80%
Residential loans, at fair value | Texas
Concentration Risk [Line Items]
Geographic concentrations	7.00%	7.40%
Residential loans, at fair value | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	6.30%	5.90%
Residential loans, at fair value | Washington
Concentration Risk [Line Items]
Geographic concentrations	5.70%	4.40%
Residential loans, at fair value | Illinois
Concentration Risk [Line Items]
Geographic concentrations	2.60%	2.70%
Consolidated SLST | California | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.60%	10.50%
Consolidated SLST | Florida | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.30%	10.50%
Consolidated SLST | New York | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	9.80%	9.80%
Consolidated SLST | Texas | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	4.00%	4.00%
Consolidated SLST | New Jersey | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	7.40%	7.30%
Consolidated SLST | Washington | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	1.80%	1.90%
Consolidated SLST | Illinois | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	7.20%	7.10%
Residential mortgage loans held in securitization trust, at fair value | California
Concentration Risk [Line Items]
Geographic concentrations	19.20%	22.00%
Residential mortgage loans held in securitization trust, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentrations	10.20%	8.90%
Residential mortgage loans held in securitization trust, at fair value | New York
Concentration Risk [Line Items]
Geographic concentrations	8.60%	9.20%
Residential mortgage loans held in securitization trust, at fair value | Texas
Concentration Risk [Line Items]
Geographic concentrations	7.30%	4.30%
Residential mortgage loans held in securitization trust, at fair value | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.60%	6.40%
Residential mortgage loans held in securitization trust, at fair value | Washington
Concentration Risk [Line Items]
Geographic concentrations	2.90%	3.10%
Residential mortgage loans held in securitization trust, at fair value | Illinois
Concentration Risk [Line Items]
Geographic concentrations	3.20%	2.30%

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