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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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