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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	22.30%	23.60%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.90%	13.10%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	8.20%	9.20%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.40%	5.60%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	6.50%	5.60%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.10%	2.50%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.80%	10.90%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	10.50%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.50%	9.30%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	7.10%
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 | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	6.90%	6.80%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	23.00%	19.80%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.00%	8.10%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.10%	8.90%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.10%	5.60%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.30%	4.30%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.20%	2.70%

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