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Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Fair Value | $ (41,914)us-gaap_DerivativeFairValueOfDerivativeNet | $ (10,381)us-gaap_DerivativeFairValueOfDerivativeNet
Notional Amount | 3,663,084 invest_DerivativeNotionalAmount | 1,488,922 invest_DerivativeNotionalAmount
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 16,417 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 7,786 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Notional Amount | 1,987,467 invest_DerivativeNotionalAmount / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 859,360 invest_DerivativeNotionalAmount / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative Assets | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Fair Value |  | 5,972 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Notional Amount |  | 268,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 6,654 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 1,138 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Notional Amount | 1,074,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 241,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 7,006 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 595 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Notional Amount | 575,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 340,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative Assets | Credit Default Index Swaps |  |
Derivative [Line Items] |  |
Fair Value | 1,597 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_CreditDefaultIndexSwapsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
Notional Amount | 50,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_CreditDefaultIndexSwapsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
Derivative Assets | Loan Purchase Commitments |  |
Derivative [Line Items] |  |
Fair Value | 1,160 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |
Notional Amount | 288,467 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 360 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative Assets | Loan forward Sales Commitments |  |
Derivative [Line Items] |  |
Fair Value |  | 81 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ForwardSalesCommitmentsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Notional Amount |  | 10,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_ForwardSalesCommitmentsMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (58,331)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | (18,167)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Notional Amount | 1,675,617 invest_DerivativeNotionalAmount / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 629,562 invest_DerivativeNotionalAmount / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Derivative Liabilities | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Fair Value | (1,328)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | (80)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Notional Amount | 206,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 50,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (9,506)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | (661)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Notional Amount | 1,110,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 235,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Derivative Liabilities | Futures |  |
Derivative [Line Items] |  |
Fair Value | (372)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | (528)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Notional Amount | 90,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 162,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Derivative Liabilities | Loan Purchase Commitments |  |
Derivative [Line Items] |  |
Fair Value | (41)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | (379)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Notional Amount | 27,324 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 42,562 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Derivative Liabilities | Loan forward Sales Commitments |  |
Derivative [Line Items] |  |
Fair Value | (239)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ForwardSalesCommitmentsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
Notional Amount | 102,793 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rwt_ForwardSalesCommitmentsMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember |
Derivative Liabilities | Cash Flow Hedging | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Fair Value | (46,845)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | (16,519)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Notional Amount | $ 139,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | $ 139,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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