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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) Contract | Dec. 31, 2014 USD ($) Contract
Short-term Debt [Line Items] |  |  |
Number of Facilities | Contract |  | 16 | 17
Outstanding | [1] | $ 1,872,793,000 | $ 1,793,825,000
Weighted Average Interest Rate |  | 1.67% | 1.73%
Weighted Average Days Until Maturity |  | 128 days | 112 days
Residential Loans |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Contract |  | 4 | 5
Outstanding |  | $ 1,161,202,000 | $ 1,076,188,000
Weighted Average Interest Rate |  | 1.73% | 1.74%
Limit |  | $ 1,550,000,000 | $ 1,550,000,000
Weighted Average Days Until Maturity |  | 147 days | 156 days
Residential Loans | Minimum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2015-12 | 2015-02
Residential Loans | Maximum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2016-06 | 2015-12
Residential Loans Held for Investment |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Contract |  | 1 |
Outstanding |  | $ 125,689,000 |
Weighted Average Interest Rate |  | 0.19% |
Limit |  | $ 0 |
Weighted Average Days Until Maturity |  | 286 days |
Residential Loans Held for Investment | Minimum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2016-07 |
Residential Loans Held for Investment | Maximum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2016-09 |
Commercial Loans |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Contract |  | 3 | 3
Outstanding |  | $ 110,408,000 | $ 109,128,000
Weighted Average Interest Rate |  | 3.59% | 3.66%
Limit |  | $ 450,000,000 | $ 400,000,000
Weighted Average Days Until Maturity |  | 225 days | 185 days
Commercial Loans | Minimum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2015-11 | 2015-04
Commercial Loans | Maximum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2016-09 | 2016-10
Real Estate Securities |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | Contract |  | 8 | 9
Outstanding |  | $ 475,494,000 | $ 608,509,000
Weighted Average Interest Rate |  | 1.44% | 1.38%
Weighted Average Days Until Maturity |  | 18 days | 20 days
Real Estate Securities | Minimum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2015-10 | 2015-01
Real Estate Securities | Maximum |  |  |
Short-term Debt [Line Items] |  |  |
Maturity |  | 2015-12 | 2015-03
[1] | 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, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,539,350 and $1,900,208, respectively. At September 30, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,179,884 and $1,546,490, respectively. See Note 4 for further discussion.

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