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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Servicing Assets at Fair Value [Line Items]    
Balance at beginning of period $ 139,293us-gaap_ServicingAssetAtFairValueAmount [1]  
Additions 15,675us-gaap_ServicingAssetAtFairValueAdditions 2,294us-gaap_ServicingAssetAtFairValueAdditions
Changes in fair value due to:    
Balance at End of Period 120,324us-gaap_ServicingAssetAtFairValueAmount [1]  
Mortgage Servicing Rights    
Servicing Assets at Fair Value [Line Items]    
Balance at beginning of period 139,293us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember		 64,824us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember
Additions 18,754us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember		 2,858us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember
Sales (18,206)us-gaap_ServicingAssetAtFairValueDisposals
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember		 0us-gaap_ServicingAssetAtFairValueDisposals
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember
Changes in fair value due to:    
Changes in assumptions (14,036)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember		 (1,125)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember
Other changes (5,481)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember		 (1,586)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember
Balance at End of Period $ 120,324us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember		 $ 64,971us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember
[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 March 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,716,563 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,354,298 and $1,546,490, respectively. See Note 4 for further discussion.