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
Mar. 31, 2026	Mar. 31, 2025
Consolidated SLST \| VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ (6,913)	$ 12,895
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
Residential loans
Assets
Unrealized gains (losses)	$ (1,802)	$ (2,342)
Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	(18,657)	23,905
Residential loans held for sale
Assets
Unrealized gains (losses)	2,590	0
Multi-family loans
Assets
Unrealized gains (losses)	(4)	410
Equity investments
Assets
Unrealized gains (losses)	(46)	(1,363)
IRLCs
Assets
Unrealized gains (losses)	464	0
MSRs
Assets
Unrealized gains (losses)	(928)	(706)
Collateralized Debt Obligations \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ 6,817	$ (9,631)
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

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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

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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/exampleRef
-Topic 820
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