Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets carried at fair value
Investment securities available for sale:	$ 0	$ 31
Derivative assets:
Derivative assets	10,788	19,604
Derivative liabilities
Derivative assets	1,481	6,510
Variation Margin	44,492	27,447
Interest rate caps
Derivative assets:
Derivative assets	1,481	6,510
Interest rate swaps
Derivative assets:
Derivative assets	9,307	13,094
Derivative liabilities
Variation Margin	35,207	27,447
Credit default swaps
Derivative liabilities
Variation Margin	9,285
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	146,833	147,116
Assets of disposal group held for sale	308	2,960
Total	7,398,650	5,350,498
Derivative liabilities
Total	1,961,128	593,737
Fair Value, Measurements, Recurring \| Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	60,900	0
Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Derivative assets	1,481	6,510
Fair Value, Measurements, Recurring \| Interest rate swaps
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	44,500	27,400
Fair Value, Measurements, Recurring \| Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures \| Central Clearing House
Derivative liabilities
Derivative liabilities	53,800	40,500
Derivative assets	9,300	13,100
Fair Value, Measurements, Recurring \| Residential loans
Assets carried at fair value
Residential loans, at fair value	700,855	827,535
Fair Value, Measurements, Recurring \| Consolidated SLST \| Consolidated SLST \| VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,008,583	754,860
Liabilities carried at fair value
Consolidated SLST	845,811	593,737
Fair Value, Measurements, Recurring \| Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	2,067,706	1,501,908
Fair Value, Measurements, Recurring \| Agency RMBS
Assets carried at fair value
Investment securities available for sale:	2,967,966	1,989,324
Fair Value, Measurements, Recurring \| Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	68,216	24,493
Fair Value, Measurements, Recurring \| U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	349,088	0
Fair Value, Measurements, Recurring \| Multi-family loans
Assets carried at fair value
Multi-family loans	87,614	95,792
Fair Value, Measurements, Recurring \| Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	981,779	0
Fair Value, Measurements, Recurring \| Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	72,638	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 \| Interest rate swaps
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 \| 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 \| Residential loan securitizations
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 carried at fair value
Equity investments	0	0
Assets of disposal group held for sale	308	2,960
Total	3,387,059	2,023,287
Derivative liabilities
Total	1,115,317	0
Derivative assets	1,481	6,510
Level 2 \| Fair Value, Measurements, Recurring \| Senior unsecured notes
Liabilities carried at fair value
Senior unsecured notes	60,900	0
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Derivative assets	1,481	6,510
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate swaps
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	300	3,000
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 \| Agency RMBS
Assets carried at fair value
Investment securities available for sale:	2,967,966	1,989,324
Level 2 \| Fair Value, Measurements, Recurring \| Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	68,216	24,493
Level 2 \| Fair Value, Measurements, Recurring \| U.S. Treasury securities
Assets carried at fair value
Investment securities available for sale:	349,088	0
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 \| Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	981,779	0
Level 2 \| Fair Value, Measurements, Recurring \| Non-Agency RMBS re-securitization
Liabilities carried at fair value
Consolidated SLST	72,638	0
Level 3 \| Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	146,833	147,116
Assets of disposal group held for sale	0	0
Total	4,011,591	3,327,211
Derivative liabilities
Total	845,811	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 \| Interest rate swaps
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	700,855	827,535
Level 3 \| Fair Value, Measurements, Recurring \| Consolidated SLST \| Consolidated SLST \| VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,008,583	754,860
Liabilities carried at fair value
Consolidated SLST	845,811	593,737
Level 3 \| Fair Value, Measurements, Recurring \| Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	2,067,706	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 \| 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	87,614	95,792
Level 3 \| Fair Value, Measurements, Recurring \| Residential loan securitizations
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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