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Derivative Financial Instruments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative [Line Items] |  |  |
Notional Amount | $ 3,663,084,000 invest_DerivativeNotionalAmount | $ 1,488,922,000 invest_DerivativeNotionalAmount |
Net unrealized losses on interest rate agreements accounted for as cash flow hedges | (30,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (16,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |
Hedges decreased in value recorded as a component of interest expense |  |  | 15,000,000 us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
Acacia |  |  |
Derivative [Line Items] |  |  |
Hedges decreased in value recorded as a component of interest expense |  |  | 11,000,000 us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_AcaciaSecuritizationEntitiesMember
Redwood |  |  |
Derivative [Line Items] |  |  |
Number of outstanding derivative agreements with counterparties | 6 rwt_NumberOfDerivativeCounterparty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember |  |
Cash Flow Hedging | Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 140,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  |
Valuation adjustments on derivatives | (30,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 32,000,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 4,000,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Unsecuritized Residential and Commercial Loans | Other Investments |  |  |
Derivative [Line Items] |  |  |
Valuation adjustments on derivatives | (7,800,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember | 200,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember | (12,600,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember
Unsecuritized Residential and Commercial Loans | Unsecuritized Loans |  |  |
Derivative [Line Items] |  |  |
Valuation adjustments on derivatives | (31,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_BalanceSheetLocationAxis = rwt_UnsecuritizedLoansMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember | 51,000,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_BalanceSheetLocationAxis = rwt_UnsecuritizedLoansMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember | (11,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_BalanceSheetLocationAxis = rwt_UnsecuritizedLoansMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember
Unsecuritized Residential and Commercial Loans | Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 920,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember |  |
Unsecuritized Residential and Commercial Loans | Futures |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 90,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember |  |
Unsecuritized Residential and Commercial Loans | TBAs |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 2,200,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember |  |
Loan Purchase and Forward Sales Commitments |  |  |
Derivative [Line Items] |  |  |
Valuation adjustments on derivatives | 14,000,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_LoanPurchaseAndForwardSalesCommitmentsMember | (1,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_LoanPurchaseAndForwardSalesCommitmentsMember |
Maximum |  |  |
Derivative [Line Items] |  |  |
Hedges decreased in value recorded as a component of interest expense | 1,000,000 us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_RangeAxis = us-gaap_MaximumMember | 1,000,000 us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_RangeAxis = us-gaap_MaximumMember |
Maximum | Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Accumulated other comprehensive loss that will be amortized into interest expense | $ (1,000,000)rwt_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesThatWillBeAmortizedIntoInterestExpense / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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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 Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, That Will Be Amortized into Interest Expense + References No definition available. + Details
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- Definition Number Of Derivative Counterparty + References No definition available. + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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