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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, 2020	Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	$ 4,000	$ 7,000
Total Realized Gains on Sales and Calls of AFS Securities, net	3,852	10,686
Sales
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	7,705	6,660
Gross realized losses - sales	(3,853)	0
Calls
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	$ 0	$ 4,026

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- Definition

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

+ References

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- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563

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- Definition

Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563

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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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