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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Assets carried at fair value
Investment securities available for sale:	$ 4,646,812,000	$ 3,828,544,000
Derivative assets:
Interest rate caps	13,823,000	64,950,000
Mortgage servicing rights	20,297,000	21,003,000	$ 0
Derivative liabilities
Derivative assets	3,530,000	56,000
Variation Margin	28,966,000	9,120,000
Interest rate caps
Derivative assets:
Interest rate caps	346,000	56,000
Interest rate swaps
Derivative assets:
Interest rate caps	10,293,000	63,942,000
Derivative liabilities
Variation Margin	20,129,000	0
U.S. Treasury futures
Derivative assets:
Interest rate caps		952,000
Derivative liabilities
Variation Margin	967,000	0
Credit default swaps
Derivative liabilities
Variation Margin	7,870,000	9,120,000
Agency RMBS
Assets carried at fair value
Investment securities available for sale:	4,558,720,000	3,136,812,000
U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	24,305,000	622,045,000
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	93,999,000	113,492,000
Derivative assets:
Assets of disposal group held for sale	222,000	67,000
Total	8,765,350,000	7,891,092,000
Derivative liabilities
Total	2,568,902,000	2,195,990,000
Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	139,761,000	60,310,000
Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Interest rate caps	346,000	56,000
Fair Value, Measurements, Recurring | Options
Derivative assets:
Interest rate caps	3,184,000	0
Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Interest rate caps	0	0	$ 0
Derivative liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures
Derivative liabilities
Variation Margin	29,000,000	45,000,000
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House
Derivative liabilities
Derivative liabilities	39,300,000	19,900,000
Derivative assets	10,300,000	64,900,000
Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	445,562,000	632,266,000
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	959,250,000	965,672,000
Liabilities carried at fair value
Consolidated SLST	805,273,000	811,591,000
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	2,508,456,000	2,243,800,000
Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	1,554,353,000	1,253,332,000
Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	4,558,720,000	3,136,812,000
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	63,787,000	69,687,000
Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	24,305,000	622,045,000
Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	87,222,000	86,192,000
Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	69,515,000	70,757,000
Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	20,297,000	21,003,000
Level 1 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Derivative assets:
Assets of disposal group held for sale	0	0
Total	0	0
Derivative liabilities
Total	0	0
Level 1 | Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	0	0
Level 1 | Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Interest rate caps	0	0
Level 1 | Fair Value, Measurements, Recurring | Options
Derivative assets:
Interest rate caps	0	0
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Interest rate caps	0	0
Derivative liabilities
Derivative liabilities	0	0
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative liabilities
Derivative liabilities	0	0
Level 1 | Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities
Derivative liabilities	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	0	0
Liabilities carried at fair value
Consolidated SLST	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	0	0
Level 1 | Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	0	0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	0	0
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	0	0
Level 1 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	0	0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	0	0
Level 1 | Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Derivative assets:
Assets of disposal group held for sale	222,000	67,000
Total	4,650,564,000	3,828,667,000
Derivative liabilities
Total	1,763,629,000	1,384,399,000
Derivative assets	3,530,000	56,000
Level 2 | Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	139,761,000	60,310,000
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Interest rate caps	346,000	56,000
Level 2 | Fair Value, Measurements, Recurring | Options
Derivative assets:
Interest rate caps	3,184,000	0
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Interest rate caps	0	0
Derivative liabilities
Derivative liabilities	0	0
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative liabilities
Derivative liabilities	0	0
Level 2 | Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities
Derivative liabilities	0	0
Level 2 | Fair Value, Measurements, Recurring | Derivative Asset
Derivative assets:
Assets of disposal group held for sale	200,000	100,000
Level 2 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	0	0
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	0	0
Liabilities carried at fair value
Consolidated SLST	0	0
Level 2 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	0	0
Level 2 | Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	1,554,353,000	1,253,332,000
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	4,558,720,000	3,136,812,000
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	63,787,000	69,687,000
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	24,305,000	622,045,000
Level 2 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	0	0
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	69,515,000	70,757,000
Level 2 | Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	0	0
Level 3 | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	20,297,000
Level 3 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	93,999,000	113,492,000
Derivative assets:
Assets of disposal group held for sale	0	0
Total	4,114,786,000	4,062,425,000
Derivative liabilities
Total	805,273,000	811,591,000
Level 3 | Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	0	0
Level 3 | Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Interest rate caps	0	0
Level 3 | Fair Value, Measurements, Recurring | Options
Derivative assets:
Interest rate caps	0	0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Interest rate caps	0	0
Derivative liabilities
Derivative liabilities	0	0
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative liabilities
Derivative liabilities	0	0
Level 3 | Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities
Derivative liabilities	0	0
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	445,562,000	632,266,000
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	959,250,000	965,672,000
Liabilities carried at fair value
Consolidated SLST	805,273,000	811,591,000
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	2,508,456,000	2,243,800,000
Level 3 | Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	0	0
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	0	0
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	0	0
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	0	0
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	87,222,000	86,192,000
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	0	0
Level 3 | Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	$ 20,297,000	$ 21,003,000

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