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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	21.40%	21.70%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	10.20%	8.80%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	9.30%	10.40%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	7.80%	7.40%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.00%	5.90%
Residential loans | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	5.40%	4.60%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.20%	2.70%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.40%	10.50%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.80%	9.80%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.40%	10.50%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	4.00%	4.00%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.40%	7.30%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	2.70%	2.70%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	7.10%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	21.90%	22.00%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	7.40%	9.20%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.00%	8.90%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	4.30%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	4.70%	6.40%
Residential loans held in securitization trusts | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	7.50%	5.60%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.20%	2.30%

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