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Residential Mortgage Loans, At Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk - Residential mortgage loans, at fair value	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
California
Concentration Risk [Line Items]
Geographic concentrations	35.90%	63.30%
New Jersey
Concentration Risk [Line Items]
Geographic concentrations	7.70%	2.50%
Florida
Concentration Risk [Line Items]
Geographic concentrations	6.60%	5.60%

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- Definition

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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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