Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets carried at fair value
Investment securities available for sale:	$ 31	$ 23,645
Derivative assets:
Interest rate caps	19,604	2,473
Derivative liabilities:
Derivative assets	6,510	2,473
Variation Margin	27,447
Interest rate caps
Derivative assets:
Interest rate caps	6,510
Interest rate swaps
Derivative assets:
Interest rate caps	13,094	2,473
Derivative liabilities:
Variation Margin	27,447
Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	147,116	179,746
Assets of disposal group held for sale	2,960	38,428
Total	5,350,498	3,932,820
Derivative liabilities:
Total	593,737	634,495
Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Interest rate caps	6,510	2,473
Fair Value, Measurements, Recurring \| Interest rate swaps
Derivative liabilities:
Derivative liability	0	0
Fair Value, Measurements, Recurring \| Interest rate swaps \| Central Clearing House
Derivative liabilities:
Derivative liability	40,500
Derivative assets	13,100
Fair Value, Measurements, Recurring \| Consolidated SLST \| VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	754,860	827,582
Fair Value, Measurements, Recurring \| Residential loans
Assets carried at fair value
Residential loans, at fair value	827,535	1,081,384
Fair Value, Measurements, Recurring \| Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,501,908	1,616,114
Fair Value, Measurements, Recurring \| Agency RMBS
Assets carried at fair value
Investment securities available for sale:	1,989,324	0
Fair Value, Measurements, Recurring \| Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	24,493	68,570
Fair Value, Measurements, Recurring \| CMBS
Assets carried at fair value
Investment securities available for sale:	0	30,133
Fair Value, Measurements, Recurring \| ABS
Assets carried at fair value
Investment securities available for sale:	0	856
Fair Value, Measurements, Recurring \| Multi-family loans
Assets carried at fair value
Multi-family loans	95,792	87,534
Fair Value, Measurements, Recurring \| Consolidated SLST CDOs \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	593,737	634,495
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:
Interest rate caps	0	0
Level 1 \| Fair Value, Measurements, Recurring \| Interest rate 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 \| CMBS
Assets carried at fair value
Investment securities available for sale:	0	0
Level 1 \| Fair Value, Measurements, Recurring \| ABS
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 CDOs \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	0	0
Level 2
Derivative liabilities:
Derivative assets	6,510	2,473
Level 2 \| Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	0	0
Assets of disposal group held for sale	2,960	29,418
Total	2,023,287	131,450
Derivative liabilities:
Total	0	0
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Interest rate caps	6,510	2,473
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate 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	3,000	29,400
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:	1,989,324	0
Level 2 \| Fair Value, Measurements, Recurring \| Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	24,493	68,570
Level 2 \| Fair Value, Measurements, Recurring \| CMBS
Assets carried at fair value
Investment securities available for sale:	0	30,133
Level 2 \| Fair Value, Measurements, Recurring \| ABS
Assets carried at fair value
Investment securities available for sale:	0	856
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 CDOs \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	0	0
Level 3
Assets carried at fair value
Fair Value	147,116	179,746
Level 3 \| Fair Value, Measurements, Recurring
Assets carried at fair value
Fair Value	147,116	179,746
Assets of disposal group held for sale	0	9,010
Total	3,327,211	3,801,370
Derivative liabilities:
Total	593,737	634,495
Level 3 \| Fair Value, Measurements, Recurring \| Interest rate caps
Derivative assets:
Interest rate caps	0	0
Level 3 \| Fair Value, Measurements, Recurring \| Interest rate 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	754,860	827,582
Level 3 \| Fair Value, Measurements, Recurring \| Residential loans
Assets carried at fair value
Residential loans, at fair value	827,535	1,081,384
Level 3 \| Fair Value, Measurements, Recurring \| Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,501,908	1,616,114
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 \| CMBS
Assets carried at fair value
Investment securities available for sale:	0	0
Level 3 \| Fair Value, Measurements, Recurring \| ABS
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	95,792	87,534
Level 3 \| Fair Value, Measurements, Recurring \| Consolidated SLST CDOs \| Consolidated SLST \| VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	$ 593,737	634,495
Level 3 \| Fair Value, Measurements, Recurring \| Equity investments
Assets carried at fair value
Assets of disposal group held for sale		$ 9,000

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