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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) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Assets
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
Liabilities
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
Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	$ 28,655	$ (30,705)	$ 27,855	$ (38,230)
Residential loans | Level 3
Assets
Unrealized gains (losses)	2,305	(8,986)	(3,768)	(12,927)
Residential Loans Held in Securitization Trusts | Level 3
Assets
Unrealized gains (losses)	42,170	(15,178)	34,918	4,698
Multi-Family Loans | Level 3
Assets
Unrealized gains (losses)	176	(17)	(4,613)	762
Equity investments | Level 3
Assets
Unrealized gains (losses)	(1,097)	(1,105)	(7,677)	(5,027)
Equity investments in disposal group held for sale | Level 3
Assets
Unrealized gains (losses)	0	(2,622)	0	(3,937)
Collateralized Debt Obligations | Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ (21,902)	$ 21,380	$ (20,596)	$ 18,876

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