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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 25,073	$ 29,520
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	225,300	239,631
Total	4,434,715	4,136,097
Liabilities carried at fair value
Total	754,264	839,419
Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	1,721,218	1,703,290
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	969,853	1,070,882
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,262,356	801,429
Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	110,208	120,021
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	75,499	128,019
Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	31,576	33,146
Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	38,705	39,679
Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	754,264	839,419
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 | Non-Agency RMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	0	0
Level 1 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	0	0
Level 1 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	0	0
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | 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
Debt Securities, Available-for-Sale, Excluding Accrued Interest	145,780	200,844
Level 2 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Total	145,780	200,844
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 | Non-Agency RMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	75,499	128,019
Level 2 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	31,576	33,146
Level 2 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	38,705	39,679
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | 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	225,300	239,631
Level 3 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	225,300	239,631
Total	4,288,935	3,935,253
Liabilities carried at fair value
Total	754,264	839,419
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	1,721,218	1,703,290
Level 3 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	969,853	1,070,882
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,262,356	801,429
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	110,208	120,021
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	0	0
Level 3 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	0	0
Level 3 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	0	0
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	$ 754,264	$ 839,419

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