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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.80%	10.90%
Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.50%	10.50%
Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.30%	9.30%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	7.10%
Consolidated SLST | VIE, Primary Beneficiary | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.00%	4.00%
Consolidated SLST | VIE, Primary Beneficiary | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	3.80%	3.80%
Consolidated SLST | VIE, Primary Beneficiary | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	6.80%	6.80%
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	24.50%	23.60%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	12.80%	13.10%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	8.70%	9.20%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.20%	5.60%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	5.40%	5.60%
Residential loans | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	2.70%	2.80%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.40%	2.50%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	19.60%	19.80%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	8.10%	8.10%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.20%	8.90%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.70%	5.60%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.40%	4.30%
Residential loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	6.10%	6.30%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.50%	2.70%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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