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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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 16,810	$ (1,306)	$ 29,705	$ (800)
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	Unrealized gains (losses), net
Residential loans
Assets
Unrealized gains (losses)	$ 904	$ (1,912)	$ 7,605	$ (10,592)
Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	8,503	(6,359)	33,297	(7,156)
Multi-Family Loans
Assets
Unrealized gains (losses)	56	(16)	360	(4,794)
Equity investments
Assets
Unrealized gains (losses)	(2,740)	(419)	(3,876)	(6,581)
Equity investments | Assets of disposal group held for sale
Assets
Unrealized gains (losses)	(611)	0	(838)	0
Mortgage servicing rights
Assets
Unrealized gains (losses)	(848)	0	(1,554)	0
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ (11,289)	$ 1,848	$ (20,920)	$ 1,306
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	Unrealized gains (losses), net

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