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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Available-for-sale securities	$ 361,841	$ 507,666
Senior IO Securities
Investment Holdings [Line Items]
Available-for-sale securities	114,628	179,864
Subordinate Securities | Mezzanine
Investment Holdings [Line Items]
Available-for-sale securities	36,377	92,002
Subordinate Securities | Subordinate
Investment Holdings [Line Items]
Available-for-sale securities	$ 210,836	$ 235,800

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details

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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.

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- Details

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