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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liabilities
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unrealized gains (losses), net	Unrealized gains (losses), net
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unrealized gains (losses), net	Unrealized gains (losses), net
Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 15,807	$ (66,645)
Residential loans | Level 3
Assets
Unrealized gains (losses)	(3,320)	(25,440)
Residential Loans Held in Securitization Trusts | Level 3
Assets
Unrealized gains (losses)	30,077	(32,566)
Preferred Equity and Mezzanine Loan Investments | Level 3
Assets
Unrealized gains (losses)	453	291
Equity investments | Level 3
Assets
Unrealized gains (losses)	(2,577)	1,115
Equity investments in disposal group held for sale | Level 3
Assets
Unrealized gains (losses)	1,060	0
Collateralized Debt Obligations | Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ (13,508)	$ 51,366

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Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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

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-Publisher FASB
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+ References

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