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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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