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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 41,063	$ 0	$ 28,014	$ 0
Distressed and other residential mortgage loans, at fair value
Assets
Unrealized gains (losses)	35,420	17,413	(883)	37,079
Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	817	0	(823)	0
Investment in unconsolidated entities
Assets
Unrealized gains (losses)	7	449	(4,052)	1,295
Preferred equity and mezzanine loan investments
Assets
Unrealized gains (losses)	(955)	0	(6,518)	0
Multi-family loans held in securitization trust
Assets
Unrealized gains (losses)	0	197,837	0	802,625
Multi-family collateralized debt obligations, at fair value
Liabilities
Unrealized gains (losses)	0	(190,207)	0	(780,378)
Residential collateralized debt obligations, at fair value
Liabilities
Unrealized gains (losses)	$ (13,918)	$ 0	$ (62,907)	$ 0

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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)
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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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