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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets carried at fair value
Investment securities available for sale:	$ 24,582	$ 29,520
Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	223,651	239,631
Total	4,800,174	4,136,097
Liabilities carried at fair value
Total	710,233	839,419
Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	2,193,319	1,703,290
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets carried at fair value
Residential loans, at fair value	920,778	1,070,882
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts
Assets carried at fair value
Residential loans, at fair value	1,215,095	801,429
Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	106,825	120,021
Fair Value, Measurements, Recurring | Non-Agency RMBS
Assets carried at fair value
Investment securities available for sale:	74,822	128,019
Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale:	30,096	33,146
Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale:	35,588	39,679
Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	710,233	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
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 | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	0	0
Level 2
Assets carried at fair value
Investment securities available for sale:	140,506	200,844
Level 2 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	0	0
Total	140,506	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
Investment securities available for sale:	74,822	128,019
Level 2 | Fair Value, Measurements, Recurring | CMBS
Assets carried at fair value
Investment securities available for sale:	30,096	33,146
Level 2 | Fair Value, Measurements, Recurring | ABS
Assets carried at fair value
Investment securities available for sale:	35,588	39,679
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
Equity investments	223,651	239,631
Level 3 | Fair Value, Measurements, Recurring
Assets carried at fair value
Equity investments	223,651	239,631
Total	4,659,668	3,935,253
Liabilities carried at fair value
Total	710,233	839,419
Level 3 | Fair Value, Measurements, Recurring | Residential loans
Assets carried at fair value
Residential loans, at fair value	2,193,319	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	920,778	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	1,215,095	801,429
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans
Assets carried at fair value
Multi-family loans	106,825	120,021
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 | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary
Liabilities carried at fair value
Consolidated SLST CDOs	$ 710,233	$ 839,419

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