Fair Value of Financial Instruments - Schedule of Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Consolidated SLST \| VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 41,170	$ 8,611	$ (8,086)
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	Unrealized gains (losses), net
Residential loans
Assets
Unrealized gains (losses)	$ 2,539	$ (7,966)	$ 321
Residential loans held in securitization trusts
Assets
Unrealized gains (losses)	46,675	(10,005)	56,576
Residential loans held for sale
Assets
Unrealized gains (losses)	1,754	0	0
Multi-family Loans
Assets
Unrealized gains (losses)	240	(4,750)	645
Equity investments
Assets
Unrealized gains (losses)	(6,873)	(6,319)	(7,958)
IRLCs
Assets
Unrealized gains (losses)	(3,611)	0	0
MSRs
Assets
Unrealized gains (losses)	(3,656)	616	0
Collateralized debt obligations \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ (32,710)	$ (5,709)	$ (1,930)
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	Unrealized gains (losses), net

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