Fair Value of Financial Instruments - Schedule of 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, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Consolidated SLST \| VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ (29,568)	$ 7,395	$ (47,178)	$ 37,100
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	Unrealized (losses) gains, net	Unrealized (losses) gains, net
Residential loans
Assets
Unrealized gains (losses)	$ (12,219)	$ 1,110	$ (21,388)	$ (3,557)
Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	(106,612)	16,774	(124,601)	50,064
Residential loans held for sale
Assets
Unrealized gains (losses)	3,346	2,552	3,357	2,552
Multi-family loans
Assets
Unrealized gains (losses)	2	123	(11)	479
Equity investments
Assets
Unrealized gains (losses)	(3,673)	(2,860)	(4,626)	(2,368)
IRLCs
Assets
Unrealized gains (losses)	(641)	2,383	(412)	2,383
MSRs
Assets
Unrealized gains (losses)	(123)	(1,019)	(1,923)	(2,573)
Collateralized Debt Obligations \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ 17,930	$ (4,955)	$ 33,585	$ (25,875)
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	Unrealized (losses) gains, net	Unrealized (losses) gains, net

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Indicates line item in statement of income or comprehensive income 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 102
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-102

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