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Asset-Backed Securities Issued - Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |
ABS issued principal | 1,353,021 us-gaap_SecuredDebt | [1],[2] | 1,545,119 us-gaap_SecuredDebt | [1],[2]
Asset-backed Securities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Market valuation adjustments | (126,203)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember |  |  |
Unamortized discount |  |  | (12,373)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember |
ABS issued principal | 1,353,021 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember |  | 1,545,119 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember |
Asset-backed Securities | Certificates With Principal Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal value | 1,473,602 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember |  | 1,555,413 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember |
Asset-backed Securities | Interest Only Certificates |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal value | 5,622 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember |  | 2,079 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember |
Asset-backed Securities | Sequoia |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Market valuation adjustments | (126,203)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |
Unamortized discount |  |  | (12,373)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
ABS issued principal | 1,239,065 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  | 1,416,762 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Number of series | 24 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  | 24 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Asset-backed Securities | Sequoia | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rates, by series | 0.38%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  | 0.36%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Stated maturities | 2017 |  | 2014 |
Asset-backed Securities | Sequoia | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rates, by series | 4.30%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  | 4.27%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Stated maturities | 2041 |  | 2041 |
Asset-backed Securities | Sequoia | Certificates With Principal Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal value | 1,359,646 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  | 1,427,056 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Asset-backed Securities | Sequoia | Interest Only Certificates |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal value | 5,622 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  | 2,079 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Asset-backed Securities | Residential Resecuritization |  |  |  |
Debt Instrument [Line Items] |  |  |  |
ABS issued principal | 34,280 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |  | 45,044 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Weighted average interest rates, by series | 2.17%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |  | 2.16%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Stated maturities | 2046 |  | 2046 |
Number of series | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |  | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Asset-backed Securities | Residential Resecuritization | Certificates With Principal Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal value | 34,280 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |  | 45,044 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Asset-backed Securities | Commercial Securitization |  |  |  |
Debt Instrument [Line Items] |  |  |  |
ABS issued principal | 79,676 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |  | 83,313 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
Weighted average interest rates, by series | 5.62%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |  | 5.62%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
Stated maturities | 2018 |  | 2018 |
Number of series | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |  | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
Asset-backed Securities | Commercial Securitization | Certificates With Principal Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal value | 79,676 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |  | 83,313 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
[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.
[2] | On January 1, 2015, we adopted ASU 2014-13 and began to account for residential loans held-for-investment and asset backed securities issued at consolidated Sequoia entities (which are VIEs) at fair value. At December 31, 2014, amounts presented in residential loans held-for-investment for these assets included $1,474,386 at historical cost. See Note 3 for further discussion.

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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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