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Residential Loans - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
NEW JERSEY
Concentration Risk [Line Items]
Geographic concentrations	5.70%	4.90%
Ohio
Concentration Risk [Line Items]
Geographic concentrations	5.20%	0.00%
South Carolina
Concentration Risk [Line Items]
Geographic concentrations	5.00%	8.40%
Geographic Concentration Risk | CALIFORNIA | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.90%	11.00%
Geographic Concentration Risk | FLORIDA | Residential Loans Held in Securitization Trusts
Concentration Risk [Line Items]
Geographic concentrations		12.10%
Geographic Concentration Risk | FLORIDA | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	10.50%	10.60%
Geographic Concentration Risk | NEW YORK | Residential Loans Held in Securitization Trusts
Concentration Risk [Line Items]
Geographic concentrations		36.10%
Geographic Concentration Risk | NEW YORK | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	9.30%	9.10%
Geographic Concentration Risk | TEXAS | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	4.00%	4.00%
Geographic Concentration Risk | NEW JERSEY | Residential Loans Held in Securitization Trusts
Concentration Risk [Line Items]
Geographic concentrations		12.80%
Geographic Concentration Risk | NEW JERSEY | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	7.10%	6.90%
Geographic Concentration Risk | Maryland | Residential Loans Held in Securitization Trusts
Concentration Risk [Line Items]
Geographic concentrations		5.50%
Geographic Concentration Risk | Maryland | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	3.80%	3.80%
Geographic Concentration Risk | ILLINOIS | Consolidated SLST | VIE, Primary Beneficiary
Concentration Risk [Line Items]
Geographic concentrations	6.80%	6.60%
Geographic Concentration Risk | MASSACHUSETTS | Residential Loans Held in Securitization Trusts
Concentration Risk [Line Items]
Geographic concentrations		17.20%
Residential loans, at fair value | Geographic Concentration Risk | CALIFORNIA
Concentration Risk [Line Items]
Geographic concentrations	23.60%	23.90%
Residential loans, at fair value | Geographic Concentration Risk | FLORIDA
Concentration Risk [Line Items]
Geographic concentrations	13.10%	9.40%
Residential loans, at fair value | Geographic Concentration Risk | NEW YORK
Concentration Risk [Line Items]
Geographic concentrations	9.20%	8.00%
Residential loans, at fair value | Geographic Concentration Risk | TEXAS
Concentration Risk [Line Items]
Geographic concentrations	5.60%	5.40%
Residential loans, at fair value | Geographic Concentration Risk | NEW JERSEY
Concentration Risk [Line Items]
Geographic concentrations	5.60%	5.10%
Residential loans, at fair value | Geographic Concentration Risk | Maryland
Concentration Risk [Line Items]
Geographic concentrations	2.80%	4.60%
Residential loans, at fair value | Geographic Concentration Risk | ILLINOIS
Concentration Risk [Line Items]
Geographic concentrations	2.50%	2.80%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | CALIFORNIA
Concentration Risk [Line Items]
Geographic concentrations	19.80%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | FLORIDA
Concentration Risk [Line Items]
Geographic concentrations	8.10%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | NEW YORK
Concentration Risk [Line Items]
Geographic concentrations	8.90%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | TEXAS
Concentration Risk [Line Items]
Geographic concentrations	4.30%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | NEW JERSEY
Concentration Risk [Line Items]
Geographic concentrations	5.60%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | Maryland
Concentration Risk [Line Items]
Geographic concentrations	6.30%
Residential mortgage loans held in securitization trust, at fair value | Geographic Concentration Risk | ILLINOIS
Concentration Risk [Line Items]
Geographic concentrations	2.70%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | FLORIDA
Concentration Risk [Line Items]
Geographic concentrations		10.10%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | NEW YORK
Concentration Risk [Line Items]
Geographic concentrations		5.50%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | TEXAS
Concentration Risk [Line Items]
Geographic concentrations		5.60%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | North Carolina
Concentration Risk [Line Items]
Geographic concentrations		10.50%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Georgia
Concentration Risk [Line Items]
Geographic concentrations		7.00%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | New Jersey
Concentration Risk [Line Items]
Geographic concentrations		5.80%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Ohio
Concentration Risk [Line Items]
Geographic concentrations		5.20%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | South Carolina
Concentration Risk [Line Items]
Geographic concentrations		5.20%

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