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Distressed and Other Residential Mortgage Loans, At Fair Value - Concentration of Risk (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.40% | 11.30%
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.60% | 16.60%
Geographic Concentration Risk | Residential mortgage loans, at fair value | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 23.20% | 27.90%
Geographic Concentration Risk | Residential mortgage loans, at fair value | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.80% | 9.00%
Geographic Concentration Risk | Residential mortgage loans, at fair value | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.00% | 4.20%
Geographic Concentration Risk | Residential mortgage loans, at fair value | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.00% | 5.10%

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