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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, 2024	Mar. 31, 2023
Assets
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unrealized (losses) gains, net	Unrealized (losses) gains, net
Liabilities
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unrealized (losses) gains, net	Unrealized (losses) gains, net
Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 506	$ 15,807
Residential loans | Level 3
Assets
Unrealized gains (losses)	(8,303)	(3,320)
Residential Loans Held in Securitization Trusts | Level 3
Assets
Unrealized gains (losses)	(4,362)	30,077
Preferred Equity and Mezzanine Loan Investments | Level 3
Assets
Unrealized gains (losses)	(4,777)	453
Equity investments | Level 3
Assets
Unrealized gains (losses)	(6,161)	(2,577)
Equity investments in disposal group held for sale | Level 3
Assets
Unrealized gains (losses)	0	1,060
Collateralized Debt Obligations | Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ (542)	$ (13,508)

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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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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