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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 14, 2019 USD ($) | Dec. 31, 2019 USD ($) securitization | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) securitization | Dec. 31, 2018 USD ($) securitization | Dec. 31, 2017 USD ($) | Mar. 25, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ |  | $ 0 | $ 0 | $ 0 | $ (2,857) | $ (2,857) | $ 0 | $ 0 |
Unconsolidated VIE, maximum loss exposure | $ |  | $ 400,900 |  |  |  | $ 400,900 | 269,800 |  |
Multi-family CMBS Re-securitization |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Securitized debt, principal amount | $ | $ 33,200 |  |  |  |  |  | $ 33,177 |  |
Loss on extinguishment of debt | $ | $ (2,900) |  |  |  |  |  |  |  |
Number of consolidated securitizations |  |  |  |  |  |  | 1 |  |
Non-Financing VIEs, Multi-Family CMBS |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of securitizations considered non-financing VIEs |  |  |  |  |  |  | 8 |  |
Residential Mortgage Loan Securitization |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of securitizations completed to date |  | 4 |  |  |  | 4 |  |  |
Distressed residential mortgage loans |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Securitized debt, principal amount | $ |  |  |  |  |  |  | $ 12,381 |  | $ 6,500
Number of securitizations, consolidated, accounted for as permanent financing |  | 3 |  |  |  | 3 |  |  |
RBDHC |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, cumulative percentage ownership after all transactions |  |  |  |  |  | 100.00% |  |  |
RBDHC | VIE, Primary Beneficiary |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  |  |  | 50.00% |  |  |
Consolidated K-Series | Non-Financing VIEs, Multi-Family CMBS |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of securitizations considered non-financing VIEs |  | 14 |  |  |  | 14 | 8 |  |
Consolidated K-Series | VIE, Primary Beneficiary |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of consolidated securitizations |  | 14 |  |  |  | 14 | 9 |  |

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