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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
	Mar. 31, 2021	Mar. 31, 2020
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ 34,568	$ 21,966
Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	(25,343)	(88,100)
Residential loans | Residential loans
Assets
Unrealized gains (losses)	7,354	(76,295)
Residential loans | Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	15,605	(1,700)
Multi-family loans | Preferred Equity and Mezzanine Loan Investments
Assets
Unrealized gains (losses)	177	(5,559)
Multi-family loans | Equity investments
Assets
Unrealized gains (losses)	$ 123	$ (4,023)

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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=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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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