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Consolidated K-Series and Consolidated SLST - Narrative (Details) $ in Thousands | Dec. 31, 2019 USD ($) securitization | Dec. 31, 2018 USD ($) securitization | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | $ 20,780,548 | $ 12,707,625 | $ 10,157,126 | $ 7,565,459
Principal Amount of Loans Subject to Delinquent Principal or Interest | 224,706 |  |  |
Residential mortgage loans held in securitization trust, at fair value | First mortgage loans |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | 1,328,886 |  |  |
Greater than 90 days past |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | 106,199 | 60,117 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 122,918 | 75,167 |  |
Greater than 90 days past | Residential mortgage loans held in securitization trust, at fair value | First mortgage loans |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 50,741 |  |  |
Multi-family loans held in securitization trusts |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | 16,800,000 | 11,500,000 |  |
Multi-Family CDOs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | $ 16,800,000 | $ 11,500,000 |  |
Weighted average interest rate (as a percent) | 3.85% | 3.96% |  |
Consolidated K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
K-series net carrying value | $ 1,100,000 | $ 657,600 |  |
Consolidated SLST |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Consolidated SLST, carrying value | $ 276,800 |  |  |
Consolidated SLST | Multi-Family CDOs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Weighted average interest rate (as a percent) | 3.53% |  |  |
VIE, Primary Beneficiary | Multi-family loans held in securitization trusts |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | $ 1,300,000 |  |  |
Freddie Mac Multi-family Loan K-Series | Consolidated K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of securitizations | securitization | 14 | 9 |  |
Consolidated SLST | VIE, Primary Beneficiary | Multi-Family CDOs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Carrying Value | $ 1,300,000 |  |  |

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