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Residential Mortgage Loans, At Fair Value - Components of Net Gain on Residential Mortgages (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Abstract]
Net realized gain on payoff and sale of loans	$ 1,719	$ 0
Net unrealized losses	$ 41	$ 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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