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Distressed and Other Residential Mortgage Loans, At Fair Value - Concentration of Risk (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.80%	11.30%
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	11.90%	16.60%
Geographic Concentration Risk | Residential mortgage loans, at fair value | California
Concentration Risk [Line Items]
Geographic concentration, percent	27.80%	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	5.10%	4.20%
Geographic Concentration Risk | Residential mortgage loans, at fair value | New York
Concentration Risk [Line Items]
Geographic concentration, percent	5.00%	5.10%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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