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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) Facility | Dec. 31, 2016 USD ($) Facility
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  |  | 11
Outstanding Balance | [1],[2] | $ 1,938,682,000 | $ 791,539,000
Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 13 |
Outstanding Balance |  | $ 1,688,412,000 |
Convertible notes, net |  |  |
Short-term Debt [Line Items] |  |  |
Outstanding Balance |  | $ 250,270,000 |
Weighted Average Interest Rate |  | 4.63% |
Weighted Average Days Until Maturity |  | 105 days |
Residential loan warehouse | Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 4 | 4
Outstanding Balance |  | $ 1,039,666,000 | $ 485,544,000
Limit |  | $ 1,575,000,000 | $ 1,325,000,000
Weighted Average Interest Rate |  | 3.17% | 2.40%
Weighted Average Days Until Maturity |  | 197 days | 206 days
Real estate securities repo | Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Facility |  | 9 | 7
Outstanding Balance |  | $ 648,746,000 | $ 305,995,000
Limit |  | $ 0 | $ 0
Weighted Average Interest Rate |  | 2.69% | 1.91%
Weighted Average Days Until Maturity |  | 28 days | 24 days
[1] | Includes $250 million of convertible notes, which were reclassified from Long-term debt, net to Short-term debt as the maturity of the notes was less than one year as of December 31, 2017. See Note 11 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 December 31, 2017 and December 31, 2016, assets of consolidated VIEs totaled $1,259,774 and $798,317, respectively. At December 31, 2017 and December 31, 2016, liabilities of consolidated VIEs totaled $1,167,157 and $773,980, respectively. See Note 4 for further discussion.

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