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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	23.40%	23.90%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	11.70%	9.40%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	8.00%	8.00%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.40%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.20%	5.10%
Residential loans | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	3.60%	4.60%
Residential loans | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	2.50%	2.80%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.70%	2.80%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	15.80%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	6.40%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	11.00%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.40%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.00%
Residential loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	8.10%
Residential loans held in securitization trusts | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	5.50%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.20%
Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.90%	11.00%
Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.50%	10.60%
Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.20%	9.10%
Consolidated SLST | VIE, Primary Beneficiary | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.00%	4.00%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.00%	6.90%
Consolidated SLST | VIE, Primary Beneficiary | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	3.80%	3.80%
Consolidated SLST | VIE, Primary Beneficiary | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	2.80%	2.90%
Consolidated SLST | VIE, Primary Beneficiary | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	6.70%	6.60%

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