Short-Term Debt - By Weighted Average Interest Rates and Collateral Type (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Amount Borrowed	[1]	$ 1,367,062	$ 1,793,825
Weighted Average Interest Rate		1.78%
Weighted Average Days Until Maturity		154 days
Residential Loans
Short-term Debt [Line Items]
Amount Borrowed		$ 776,824	1,076,188
Weighted Average Interest Rate		1.73%
Weighted Average Days Until Maturity		233 days
Commercial Loans
Short-term Debt [Line Items]
Amount Borrowed		$ 96,849	109,128
Weighted Average Interest Rate		3.92%
Weighted Average Days Until Maturity		185 days
Real Estate Securities
Short-term Debt [Line Items]
Amount Borrowed		$ 493,389	$ 608,509
Weighted Average Interest Rate		1.43%
Weighted Average Days Until Maturity		22 days

[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 the primary beneficiary (Redwood Trust, Inc.). At June 30, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,622,636 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,263,249 and $1,546,490, respectively. See Note 4 for further discussion.