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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3,801,370	$ 3,935,253	$ 3,471,854
Total gains/(losses) (realized/unrealized)
Included in earnings	99,357	(375,144)	99,416
Transfers out	(52,791)	(18,858)	(4,133)
Transfers to securitization trust, net	0	0	0
Transfer from disposal group held for sale	0	0
Funding/Contributions	55,882	28,086	145,143
Paydowns/Distributions	(1,171,740)	(1,501,232)	(1,281,879)
Sales	(25,144)		(77,127)
Purchases	620,277	1,733,265	1,581,979
Balance at the end of period	$ 3,327,211	$ 3,801,370	$ 3,935,253
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Operating Income (Expense), Net	Other Operating Income (Expense), Net	Other Operating Income (Expense), Net
Residential loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,081,384	$ 1,703,290	$ 1,090,930
Total gains/(losses) (realized/unrealized)
Included in earnings	8,080	(111,879)	36,844
Transfers out	(26,277)	(17,052)	(2,080)
Transfers to securitization trust, net	(282,831)	(1,422,577)	(305,433)
Transfer from disposal group held for sale	0	0
Funding/Contributions	0	0	0
Paydowns/Distributions	(482,137)	(712,214)	(618,790)
Sales	(21,165)		(74,751)
Purchases	550,481	1,641,816	1,576,570
Balance at the end of period	827,535	1,081,384	1,703,290
Residential loans | VIE, Primary Beneficiary | Consolidated SLST
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	827,582	1,070,882	1,266,785
Total gains/(losses) (realized/unrealized)
Included in earnings	(10,748)	(128,236)	(35,953)
Transfers out	0	0	0
Transfers to securitization trust, net	0	0	0
Transfer from disposal group held for sale	0	0
Funding/Contributions	0	0	0
Paydowns/Distributions	(61,974)	(115,064)	(159,950)
Sales	0		0
Purchases	0	0	0
Balance at the end of period	754,860	827,582	1,070,882
Residential loans held in securitization trusts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1,616,114	801,429	691,451
Total gains/(losses) (realized/unrealized)
Included in earnings	72,173	(162,518)	43,001
Transfers out	(16,208)	(1,806)	(2,053)
Transfers to securitization trust, net	282,831	1,422,577	305,433
Transfer from disposal group held for sale	0	0
Funding/Contributions	0	0	0
Paydowns/Distributions	(518,819)	(535,017)	(239,436)
Sales	(3,979)		(2,376)
Purchases	69,796	91,449	5,409
Balance at the end of period	1,501,908	1,616,114	801,429
Multi-family loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	87,534	120,021	163,593
Total gains/(losses) (realized/unrealized)
Included in earnings	11,863	9,531	18,795
Transfers out	(10,306)	0	0
Transfers to securitization trust, net	0	0	0
Transfer from disposal group held for sale	0	0
Funding/Contributions	21,924	0	37,678
Paydowns/Distributions	(15,223)	(42,018)	(100,045)
Sales	0		0
Purchases	0	0	0
Balance at the end of period	95,792	87,534	120,021
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	179,746	239,631	259,095
Total gains/(losses) (realized/unrealized)
Included in earnings	21,279	18,884	36,729
Transfers out	0	0	0
Transfers to securitization trust, net	0	0	0
Transfer from disposal group held for sale	5,720	(9,936)
Funding/Contributions	33,958	28,086	107,465
Paydowns/Distributions	(93,587)	(96,919)	(163,658)
Sales	0		0
Purchases	0	0	0
Balance at the end of period	147,116	179,746	239,631
Equity investments in disposal group held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	9,010	0
Total gains/(losses) (realized/unrealized)
Included in earnings	(3,290)	(926)
Transfers out	0	0
Transfers to securitization trust, net	0	0
Transfer from disposal group held for sale	(5,720)	9,936
Funding/Contributions	0	0
Paydowns/Distributions	0	0
Sales	0
Purchases	0	0
Balance at the end of period	$ 0	$ 9,010	$ 0

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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