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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Total Realized Gains on Sales and Calls of AFS Securities, net	$ 9,363	$ 5,703
Sales
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	9,363	5,092
Calls
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	$ 0	$ 611

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- Definition

Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls

+ References

No definition available.

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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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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