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Asset-Backed Securities Issued - Summary of Accrued Interest Payable on Asset-Backed Securities Issued (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Accrued interest payable $ 14,319us-gaap_InterestPayableCurrentAndNoncurrent [1] $ 8,503us-gaap_InterestPayableCurrentAndNoncurrent [1]
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary    
Debt Instrument [Line Items]    
Accrued interest payable 1,277us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 1,371us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Sequoia    
Debt Instrument [Line Items]    
Accrued interest payable 893us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 976us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Residential Resecuritization    
Debt Instrument [Line Items]    
Accrued interest payable 10us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 5us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Commercial Securitization    
Debt Instrument [Line Items]    
Accrued interest payable $ 374us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 $ 390us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[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.