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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) $ in Millions | Mar. 31, 2017 USD ($) variable_interest_entity | May 16, 2016 | Sep. 30, 2017 securitization | Dec. 31, 2016 securitization
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Riverchase Landing and The Clusters |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of variable interest entities consolidated | variable_interest_entity | 2 |  |  |
RBDHC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Subsidiary cumulative percentage ownership after all transactions |  | 100.00% |  |
Riverchase Landing and The Clusters |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Consideration transferred | $ | $ 12.5 |  |  |
Non-Financings, Multi-Family CMBS | K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of securitizations, non-financing VIE's | securitization |  |  | 5 | 4
VIE, Primary Beneficiary | RBDHC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Noncontrolling interest, ownership by parent, percentage |  | 50.00% |  |

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