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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, 2021	Dec. 31, 2020
Assets carried at fair value
Multi-family loans	$ 151,836	$ 163,593
Investment securities available for sale:	232,590	311,284
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	260,065	259,095
Total	4,214,478	4,196,580
Liabilities carried at fair value
Total	992,288	1,054,335
Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	1,316,707	1,090,930
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	1,211,508	1,266,785
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	678,067	691,451
Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	151,836	163,593
Fair Value, Measurements, Recurring | Agency RMBS
Assets carried at fair value
Investment securities available for sale:	131,625	139,395
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	271,607	355,666
Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale:	148,441	186,440
Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale:	44,622	43,225
Fair Value, Measurements, Recurring | Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	992,288	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:	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 | Collateralized Debt Obligations | 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:	596,295	724,726
Level 2 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Total	596,295	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:	131,625	139,395
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	271,607	355,666
Level 2 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale:	148,441	186,440
Level 2 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale:	44,622	43,225
Level 2 | Fair Value, Measurements, Recurring | Collateralized Debt Obligations | 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	260,065	259,095
Level 3 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	260,065	259,095
Total	3,618,183	3,471,854
Liabilities carried at fair value
Total	992,288	1,054,335
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	1,316,707	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	1,211,508	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	678,067	691,451
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	151,836	163,593
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 | Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Collateralized debt obligations, at fair value	$ 992,288	$ 1,054,335

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