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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets carried at fair value
Investment securities available for sale:	$ 0	$ 31
Derivative assets:
Derivative assets	32,588	19,604
Derivative liabilities
Derivative assets	3,828	6,510
Variation Margin	8,835	27,447
Interest rate caps
Derivative assets:
Derivative assets	3,049	6,510
Interest rate swaps
Derivative assets:
Derivative assets	28,760	13,094
Derivative liabilities
Variation Margin	0	27,447
U.S. Treasury futures
Derivative liabilities
Variation Margin	265
Credit default swaps
Derivative liabilities
Variation Margin	8,570
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	142,915	147,116
Assets of disposal group held for sale	2,560	2,960
Total	6,417,570	5,350,498
Derivative liabilities
Total	1,637,111	593,737
Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	60,000	0
Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Derivative assets	3,049	6,510
Fair Value, Measurements, Recurring | Options
Derivative assets:
Derivative assets	779	0
Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	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	11,600	27,400
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House
Derivative liabilities
Derivative liabilities	17,200	40,500
Derivative assets	28,800	13,100
Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,004,944	754,860
Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	667,218	827,535
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,831,029	1,501,908
Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	2,613,842	1,989,324
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	58,237	24,493
Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	92,997	95,792
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST	844,032	593,737
Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	733,079	0
Level 1 | Fair Value, Measurements, Recurring
Assets carried at fair value
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 | Options
Derivative assets:
Derivative assets	0	0
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	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 | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	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 | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	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 | Multi-family loans
Assets carried at fair value
Multi-family loans	0	0
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Assets of disposal group held for sale	2,560	2,960
Total	2,678,467	2,023,287
Derivative liabilities
Total	793,079	0
Derivative assets	3,828	6,510
Level 2 | Fair Value, Measurements, Recurring | Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	60,000	0
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps
Derivative assets:
Derivative assets	3,049	6,510
Level 2 | Fair Value, Measurements, Recurring | Options
Derivative assets:
Derivative assets	779	0
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	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
Assets carried at fair value
Assets of disposal group held for sale	2,600	3,000
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	0	0
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 | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	0	0
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	2,613,842	1,989,324
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	58,237	24,493
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 | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST	0	0
Level 2 | Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	733,079	0
Level 3 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	142,915	147,116
Assets of disposal group held for sale	0	0
Total	3,739,103	3,327,211
Derivative liabilities
Total	844,032	593,737
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 | Options
Derivative assets:
Derivative assets	0	0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivative assets:
Derivative assets	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 | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,004,944	754,860
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	667,218	827,535
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,831,029	1,501,908
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 | Multi-family loans
Assets carried at fair value
Multi-family loans	92,997	95,792
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST	844,032	593,737
Level 3 | Fair Value, Measurements, Recurring | Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	$ 0	$ 0

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