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Residential Mortgage Loans, At Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]
Net realized gain on payoff and sale of loans	$ 369	$ 0
Net unrealized losses	$ (439)	$ 0

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- Definition

Net Realized Gain (Loss) On Payoff And Sale Of Mortgage Loans

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- Definition

Unrealized Gain (Loss) On Real Estate Mortgage Loans, Net

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