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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ 25,263	$ (1,985)	$ 83,151	$ 35,905
Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	(33,188)	6,287	(110,631)	(12,585)
Residential loans | Residential loans
Assets
Unrealized gains (losses)	(57,296)	7,881	(90,749)	21,476
Residential loans | Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	(66,697)	12,791	(150,664)	31,015
Multi-family loans | Preferred Equity and Mezzanine Loan Investments
Assets
Unrealized gains (losses)	(2,490)	538	(2,117)	1,203
Equity investments | Equity investments
Assets
Unrealized gains (losses)	(6,387)	(294)	(4,581)	634
Equity investments in disposal group held for sale | Equity investments in disposal group held for sale
Assets
Unrealized gains (losses)	$ (1,054)	$ 0	$ (504)	$ 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)
-URI https://asc.fasb.org/extlink&oid=126976982&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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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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