Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets carried at fair value
Investment securities available for sale:	$ 0	$ 31
Derivative assets:
Derivative assets	38,048	19,604
Derivative liabilities
Derivative Asset	(7,143)	(6,510)
Variation Margin	9,268	27,447
Interest rate caps
Derivative assets:
Derivative assets	7,123	6,510
Interest rate swaps
Derivative assets:
Derivative assets	30,879	13,094
Derivative liabilities
Variation Margin	0	27,447
U.S. Treasury futures
Derivative assets:
Derivative assets	26
Derivative liabilities
Variation Margin	0
Credit default swaps
Derivative liabilities
Variation Margin	9,268
Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures
Derivative liabilities
Variation Margin	7,000	27,400
Agency RMBS
Assets carried at fair value
Investment securities available for sale:	2,217,485
Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	137,943	147,116
Assets of disposal group held for sale	740	2,960
Total	5,582,176	5,350,498
Derivative liabilities
Total	1,079,768	593,737
Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Derivative assets	7,123	6,510
Fair Value, Measurements, Recurring \| Option
Derivative assets:
Derivative assets	20	0
Fair Value, Measurements, Recurring \| Interest rate swaps
Derivative assets:
Derivative assets	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 \| Central Clearing House
Derivative liabilities
Derivative liability	23,900	40,500
Derivative Asset	(30,900)	(13,100)
Fair Value, Measurements, Recurring \| Consolidated SLST \| VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	738,126	754,860
Fair Value, Measurements, Recurring \| Residential loans
Assets carried at fair value
Residential loans, at fair value	640,729	827,535
Fair Value, Measurements, Recurring \| Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,724,250	1,501,908
Fair Value, Measurements, Recurring \| Agency RMBS
Assets carried at fair value
Investment securities available for sale:	2,217,485	1,989,324
Fair Value, Measurements, Recurring \| Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	23,855	24,493
Fair Value, Measurements, Recurring \| Multi-family loans
Assets carried at fair value
Multi-family loans	91,905	95,792
Fair Value, Measurements, Recurring \| Consolidated SLST \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST	582,627	593,737
Fair Value, Measurements, Recurring \| Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	497,141	0
Level 1 \| Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	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 \| Interest rate caps
Derivative assets:
Derivative assets	0	0
Level 1 \| Fair Value, Measurements, Recurring \| Option
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 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 \| 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
Derivative liabilities
Derivative Asset	(7,143)	(6,510)
Level 2 \| Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	0	0
Assets of disposal group held for sale	740	2,960
Total	2,249,223	2,023,287
Derivative liabilities
Total	497,141	0
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Derivative assets	7,123	6,510
Level 2 \| Fair Value, Measurements, Recurring \| Option
Derivative assets:
Derivative assets	20	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 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 carried at fair value
Assets of disposal group held for sale	700	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:	2,217,485	1,989,324
Level 2 \| Fair Value, Measurements, Recurring \| Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	23,855	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	497,141	0
Level 3
Assets carried at fair value
Fair Value	137,943	147,116
Level 3 \| Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	137,943	147,116
Assets of disposal group held for sale	0	0
Total	3,332,953	3,327,211
Derivative liabilities
Total	582,627	593,737
Level 3 \| Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Derivative assets	0	0
Level 3 \| Fair Value, Measurements, Recurring \| Option
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 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 \| Consolidated SLST \| VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	738,126	754,860
Level 3 \| Fair Value, Measurements, Recurring \| Residential loans
Assets carried at fair value
Residential loans, at fair value	640,729	827,535
Level 3 \| Fair Value, Measurements, Recurring \| Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,724,250	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	91,905	95,792
Level 3 \| Fair Value, Measurements, Recurring \| Consolidated SLST \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST	582,627	593,737
Level 3 \| Fair Value, Measurements, Recurring \| Residential loan securitizations
Liabilities carried at fair value
Consolidated SLST	$ 0	$ 0

Financial Instruments Owned, Multi-family Loans

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Financial Instruments Owned, Residential Loans at Fair Value

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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