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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ 3,322	$ (70,956)	$ 37,890	$ (48,990)
Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	6,471	75,052,000	(18,872)	(13,049)
Residential loans | Residential loans
Assets
Unrealized gains (losses)	3,752	39,991,000	12,192	(36,303,000)
Residential loans | Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	6,030	59,000	18,611	(1,641)
Multi-family loans | Preferred Equity and Mezzanine Loan Investments
Assets
Unrealized gains (losses)	460	(127,000)	665	(5,686)
Multi-family loans | Equity investments
Assets
Unrealized gains (losses)	$ 805	$ (1,108,000)	$ 927	$ (5,130)

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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)
-URI http://asc.fasb.org/extlink&oid=123874694&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.

+ 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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