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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Liabilities
Multi-family debt held in securitization trusts	$ (190,207)	$ 45,456	$ (780,378)	$ 284,766
Multi-family loans held in securitization trust
Assets
Multi-family loans held in securitization trusts	197,837	(33,153)	802,625	(252,899)
Investment in unconsolidated entities
Assets
Multi-family loans held in securitization trusts	449	4,092	1,295	5,359
Distressed and other residential mortgage loans, at fair value
Assets
Multi-family loans held in securitization trusts	$ 17,413	$ (629)	$ 37,079	$ (754)

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- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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-Topic 820
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