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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) Facility | Dec. 31, 2017 USD ($) Facility
Short-term Debt [Line Items] |  |  |
Outstanding Balance | [1],[2] | $ 1,424,275,000 | $ 1,938,682,000
Facilities |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 16 | 13
Outstanding Balance |  | $ 1,424,275,000 | $ 1,688,412,000
Facilities | Residential loan warehouse |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 4 | 4
Outstanding Balance |  | $ 578,157,000 | $ 1,039,666,000
Limit |  | $ 1,425,000,000 | $ 1,575,000,000
Weighted Average Interest Rate |  | 3.83% | 3.17%
Weighted Average Days Until Maturity (in days) |  | 177 days | 197 days
Facilities | Real estate securities repo |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 8 | 9
Outstanding Balance |  | $ 780,818,000 | $ 648,746,000
Limit |  | $ 0 | $ 0
Weighted Average Interest Rate |  | 3.29% | 2.69%
Weighted Average Days Until Maturity (in days) |  | 27 days | 28 days
Facilities | Single-family rental loan warehouse |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 2 |
Outstanding Balance |  | $ 15,859,000 |
Limit |  | $ 400,000,000 |
Weighted Average Interest Rate |  | 4.53% |
Weighted Average Days Until Maturity (in days) |  | 661 days |
Facilities | Fix and flip loan warehouse |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 2 |
Outstanding Balance |  | $ 49,441,000 |
Limit |  | $ 60,000,000 |
Weighted Average Interest Rate |  | 5.63% |
Weighted Average Days Until Maturity (in days) |  | 205 days |
Convertible notes, net |  |  |
Short-term Debt [Line Items] |  |  |
Outstanding Balance |  |  | $ 250,270,000
Weighted Average Interest Rate |  |  | 4.63%
Weighted Average Days Until Maturity (in days) |  |  | 105 days
[1] | At December 31, 2017, balance includes $250 million of convertible notes, which matured in April 2018. See Note 12 for further discussion.
[2] | Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At September 30, 2018 and December 31, 2017, assets of consolidated VIEs totaled $3,693,140 and $1,259,774, respectively. At September 30, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $3,417,835 and $1,167,157, respectively. See Note 4 for further discussion.

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