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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
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Debt Instrument [Line Items] |  |  |  |
Accrued interest payable | $ 14,319 us-gaap_InterestPayableCurrentAndNoncurrent | [1] | $ 8,503 us-gaap_InterestPayableCurrentAndNoncurrent | [1]
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accrued interest payable | 1,277 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  | 1,371 us-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 | 893 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  | 976 us-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 | 10 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  | 5 us-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 | $ 374 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  | $ 390 us-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.

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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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