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Distressed and Other Residential Mortgage Loans, Net - Schedule of Geographic Concentrations of Credit Risk Exceeding 5% of Total Loan Balances (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.80% | 11.30%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 33.90% | 33.90%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Massachusetts |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 18.30% | 20.00%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 14.90% | 14.50%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.50% | 9.90%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.40% | 5.30%

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