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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Investment securities available for sale:	$ 0	$ 31,000
Derivative assets:
Derivative assets	64,950,000	19,604,000
Mortgage servicing rights	21,003,000	0	$ 0
Derivative liabilities:
Derivative assets	56,000	6,510,000
Variation Margin	9,120,000	27,447,000
Interest rate caps
Derivative assets:
Derivative assets	56,000	6,510,000
Interest rate swaps
Derivative assets:
Derivative assets	63,942,000	13,094,000
Derivative liabilities:
Variation Margin	0	27,447,000
U.S. Treasury futures
Derivative assets:
Derivative assets	952,000
Derivative liabilities:
Variation Margin	0
Credit default swaps
Derivative liabilities:
Variation Margin	9,120,000
Fair Value, Measurements, Recurring
Assets
Equity investments	113,492,000	147,116,000
Assets of disposal group held for sale	67,000	2,960,000
Total	7,891,092,000	5,350,498,000
Derivative liabilities:
Total	2,195,990,000	593,737,000
Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	60,310,000	0
Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Derivative assets	56,000	6,510,000
Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liability	0	0
Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities:
Derivative liability	0	0
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures
Derivative liabilities:
Variation Margin	45,000,000	27,400,000
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House
Derivative liabilities:
Derivative liability	19,900,000	40,500,000
Derivative assets	64,900,000	13,100,000
Fair Value, Measurements, Recurring | Residential loans
Assets
Residential loans, at fair value	632,266,000	827,535,000
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets
Residential loans, at fair value	965,672,000	754,860,000
Liabilities carried at fair value
Consolidated SLST	811,591,000	593,737,000
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets
Residential loans, at fair value	2,243,800,000	1,501,908,000
Fair Value, Measurements, Recurring | Agency RMBS
Assets
Investment securities available for sale:	3,136,812,000	1,989,324,000
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets
Investment securities available for sale:	69,687,000	24,493,000
Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets
Investment securities available for sale:	622,045,000	0
Fair Value, Measurements, Recurring | Multi-family loans
Assets
Multi-family loans	86,192,000	95,792,000
Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	21,003,000	0
Fair Value, Measurements, Recurring | Residential loan securitizations at fair value
Liabilities carried at fair value
Consolidated SLST	1,253,332,000	0
Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	70,757,000	0
Level 1 | Fair Value, Measurements, Recurring
Assets
Equity investments	0	0
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:
Derivative assets	0	0
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liability	0	0
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative assets:
Derivative assets	0	0
Level 1 | Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities:
Derivative liability	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential loans
Assets
Residential loans, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets
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
Residential loans, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Agency RMBS
Assets
Investment securities available for sale:	0	0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets
Investment securities available for sale:	0	0
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets
Investment securities available for sale:	0	0
Level 1 | Fair Value, Measurements, Recurring | Multi-family loans
Assets
Multi-family loans	0	0
Level 1 | Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential loan securitizations at fair value
Liabilities carried at fair value
Consolidated SLST	0	0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets
Equity investments	0	0
Assets of disposal group held for sale	67,000	2,960,000
Total	3,828,667,000	2,023,287,000
Derivative liabilities:
Total	1,384,399,000	0
Derivative assets	56,000	6,510,000
Level 2 | Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	60,310,000	0
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Derivative assets	56,000	6,510,000
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liability	0	0
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative assets:
Derivative assets	0	0
Level 2 | Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities:
Derivative liability	0	0
Level 2 | Fair Value, Measurements, Recurring | Derivative Asset
Assets
Assets of disposal group held for sale	100,000	3,000,000
Level 2 | Fair Value, Measurements, Recurring | Residential loans
Assets
Residential loans, at fair value	0	0
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets
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
Residential loans, at fair value	0	0
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS
Assets
Investment securities available for sale:	3,136,812,000	1,989,324,000
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets
Investment securities available for sale:	69,687,000	24,493,000
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets
Investment securities available for sale:	622,045,000	0
Level 2 | Fair Value, Measurements, Recurring | Multi-family loans
Assets
Multi-family loans	0	0
Level 2 | Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	0	0
Level 2 | Fair Value, Measurements, Recurring | Residential loan securitizations at fair value
Liabilities carried at fair value
Consolidated SLST	1,253,332,000	0
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	70,757,000	0
Level 3
Derivative assets:
Mortgage servicing rights	616,000	0	$ 0
Level 3 | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	21,003,000
Level 3 | Fair Value, Measurements, Recurring
Assets
Equity investments	113,492,000	147,116,000
Assets of disposal group held for sale	0	0
Total	4,062,425,000	3,327,211,000
Derivative assets:
Mortgage servicing rights	21,003,000	0
Derivative liabilities:
Total	811,591,000	593,737,000
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:
Derivative assets	0	0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	0	0
Derivative liabilities:
Derivative liability	0	0
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury futures
Derivative assets:
Derivative assets	0	0
Level 3 | Fair Value, Measurements, Recurring | Credit default swaps
Derivative liabilities:
Derivative liability	0	0
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets
Residential loans, at fair value	632,266,000	827,535,000
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Assets
Residential loans, at fair value	965,672,000	754,860,000
Liabilities carried at fair value
Consolidated SLST	811,591,000	593,737,000
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets
Residential loans, at fair value	2,243,800,000	1,501,908,000
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS
Assets
Investment securities available for sale:	0	0
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets
Investment securities available for sale:	0	0
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets
Investment securities available for sale:	0	0
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans
Assets
Multi-family loans	86,192,000	95,792,000
Level 3 | Fair Value, Measurements, Recurring | Mortgage servicing rights
Derivative assets:
Mortgage servicing rights	21,003,000	0
Level 3 | Fair Value, Measurements, Recurring | Residential loan securitizations at fair value
Liabilities carried at fair value
Consolidated SLST	0	0
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	$ 0	$ 0

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