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Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Entity | Dec. 31, 2013 Entity
Variable Interest Entity [Line Items] |  |
Assets | $ 1,900,208 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets | $ 2,299,576 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Liabilities | 1,546,490 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities | 1,944,911 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Number of VIEs | 26 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated | 26 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,474,386 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember | 1,762,167 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 194,991 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember | 257,741 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember
Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 221,676 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember | 263,204 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember
Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 327 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember | 289 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,347 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember | 5,316 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,481 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember | 10,859 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember
Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,371 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember | 1,949 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,545,119 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember | 1,942,962 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,481,303 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,768,694 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Liabilities | 1,417,738 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,695,553 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Number of VIEs | 24 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 24 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,474,386 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember | 1,762,167 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember
Sequoia | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 147 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember | 152 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Sequoia | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,359 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember | 2,714 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Sequoia | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,411 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember | 3,661 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember
Sequoia | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 976 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember | 1,218 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Sequoia | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,416,762 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember | 1,694,335 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember
Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 222,196 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 263,831 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Liabilities | 45,049 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 94,945 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Number of VIEs | 1 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 1 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 221,676 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember | 263,204 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember
Residential Resecuritization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 43 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember |
Residential Resecuritization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 477 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember | 627 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Residential Resecuritization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 5 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember | 11 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Residential Resecuritization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 45,044 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember | 94,934 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 196,709 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 267,051 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Liabilities | 83,703 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 154,413 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Number of VIEs | 1 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 1 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 194,991 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember | 257,741 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember
Commercial Securitization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 137 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember | 137 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Commercial Securitization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,511 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember | 1,975 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Commercial Securitization | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 70 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember | 7,198 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember
Commercial Securitization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 390 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember | 720 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Commercial Securitization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 83,313 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember | $ 153,693 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember

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- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
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