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Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Unfunded loan commitments	$ 852,508	$ 435,627
Commercial Mortgage and Subordinated Portfolio Segment [Member]
Schedule of Equity Method Investments [Line Items]
Unfunded loan commitments	$ 852,500

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- Definition

Mortgage Loans on Real Estate, Commitment to Lend, Unfunded Amount

+ References

No definition available.

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Period Type:	instant

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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.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:
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