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Residential Mortgage Loans, At Fair Value - Concentration of Risk (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	13.50%	3.90%
Geographic Concentration Risk | Residential mortgage loans, at fair value | California
Concentration Risk [Line Items]
Geographic concentration, percent	28.40%	35.90%
Geographic Concentration Risk | Residential mortgage loans, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	8.50%	6.60%
Geographic Concentration Risk | Residential mortgage loans, at fair value | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	6.40%	7.70%

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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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