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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	23.50%	24.30%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	14.30%	13.20%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	8.40%	8.00%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.40%	6.30%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	6.40%	7.00%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	2.60%	2.60%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	10.60%
Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.30%	10.30%
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 | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.50%	7.40%
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	7.20%	7.20%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	17.90%	19.20%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.00%	10.20%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	8.40%	8.60%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.60%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	7.80%	7.30%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.50%	3.20%

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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.

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