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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets carried at fair value
Investment securities available for sale, at fair value	$ 140,597	$ 311,284
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	255,014	259,095
Total	4,096,726	4,196,580
Liabilities carried at fair value
Total	904,976	1,054,335
Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	1,325,219	1,090,930
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,137,005	1,266,785
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	811,583	691,451
Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	119,812	163,593
Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	125,589	139,395
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	224,776	355,666
Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale, at fair value	56,243	186,440
Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale, at fair value	41,485	43,225
Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	904,976	1,054,335
Level 1 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Total	0	0
Liabilities carried at fair value
Total	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 | 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 held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	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 | Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	0	0
Level 2
Assets carried at fair value
Investment securities available for sale, at fair value	448,093	724,726
Level 2 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Total	448,093	724,726
Liabilities carried at fair value
Total	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 | 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 held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	0	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 | Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	125,589	139,395
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	224,776	355,666
Level 2 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale, at fair value	56,243	186,440
Level 2 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale, at fair value	41,485	43,225
Level 2 | Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	0	0
Level 3
Assets carried at fair value
Equity investments	255,014	259,095
Level 3 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	255,014	259,095
Total	3,648,633	3,471,854
Liabilities carried at fair value
Total	904,976	1,054,335
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	1,325,219	1,090,930
Level 3 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,137,005	1,266,785
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	811,583	691,451
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	119,812	163,593
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale, at fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	$ 904,976	$ 1,054,335

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