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Residential Loans, at Fair Value - Geographic Concentrations of Credit Risk (Details) - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Residential loans, at fair value | California
Concentration Risk [Line Items]
Geographic concentrations	21.70%	23.60%
Residential loans, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentrations	10.40%	13.10%
Residential loans, at fair value | New York
Concentration Risk [Line Items]
Geographic concentrations	8.80%	9.20%
Residential loans, at fair value | Texas
Concentration Risk [Line Items]
Geographic concentrations	7.40%	5.60%
Residential loans, at fair value | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.90%	5.60%
Residential loans, at fair value | Massachusetts
Concentration Risk [Line Items]
Geographic concentrations	4.60%	1.60%
Residential loans, at fair value | Illinois
Concentration Risk [Line Items]
Geographic concentrations	2.70%	2.50%
Residential loans, at fair value | Maryland
Concentration Risk [Line Items]
Geographic concentrations	2.50%	2.80%
Consolidated SLST | California | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.50%	10.90%
Consolidated SLST | Florida | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.50%	10.50%
Consolidated SLST | New York | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	9.80%	9.30%
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	7.30%	7.10%
Consolidated SLST | Massachusetts | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	2.70%	2.80%
Consolidated SLST | Illinois | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	7.10%	6.80%
Consolidated SLST | Maryland | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	3.90%	3.80%
Residential mortgage loans held in securitization trust, at fair value | California
Concentration Risk [Line Items]
Geographic concentrations	22.00%	19.80%
Residential mortgage loans held in securitization trust, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentrations	8.90%	8.10%
Residential mortgage loans held in securitization trust, at fair value | New York
Concentration Risk [Line Items]
Geographic concentrations	9.20%	8.90%
Residential mortgage loans held in securitization trust, at fair value | Texas
Concentration Risk [Line Items]
Geographic concentrations	4.30%	4.30%
Residential mortgage loans held in securitization trust, at fair value | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	6.40%	5.60%
Residential mortgage loans held in securitization trust, at fair value | Massachusetts
Concentration Risk [Line Items]
Geographic concentrations	5.60%	4.70%
Residential mortgage loans held in securitization trust, at fair value | Illinois
Concentration Risk [Line Items]
Geographic concentrations	2.30%	2.70%
Residential mortgage loans held in securitization trust, at fair value | Maryland
Concentration Risk [Line Items]
Geographic concentrations	4.70%	6.30%

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