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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Mortgage banking activities market valuation adjustments |  |  |  |
Adjustment to valuation of trading securities | $ (14,359)us-gaap_IncreaseDecreaseInTradingSecurities |  | $ (4,277)us-gaap_IncreaseDecreaseInTradingSecurities |
Risk management derivatives, net | (10,583)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet |  | (7,082)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet |
Loan purchase and forward sale commitments | 18,256 rwt_LoanPurchaseSaleCommitmentValuations |  | 8 rwt_LoanPurchaseSaleCommitmentValuations |
Total mortgage banking activities | 1,227 rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet |  | (597)rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet |
MSRs | (19,517)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights |  | (2,711)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | (1,145)rwt_OtherMarketValuationAdjustmentsNet | [1] | (6,138)rwt_OtherMarketValuationAdjustmentsNet | [1]
Total Market Valuation Adjustments, Net | (19,435)rwt_MarketValuationAdjustmentsNet |  | (9,446)rwt_MarketValuationAdjustmentsNet |
Residential Loans at Fair Value |  |  |  |
Mortgage banking activities market valuation adjustments |  |  |  |
Valuation adjustments | 2,056 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |  | 7,128 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |
Commercial Loans at Fair Value |  |  |  |
Mortgage banking activities market valuation adjustments |  |  |  |
Valuation adjustments | 5,857 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember |  | 3,626 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember |
Residential Loans at Lower of Cost or Fair Value |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | 2 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |  | (2)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Residential Loans Held for Investment |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | (1,093)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |  | 0 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Held For Investment Loans At Fair Value |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | 1,978 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_HeldForInvestmentLoansAtFairValueMember |  | 0 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_HeldForInvestmentLoansAtFairValueMember |
Trading Securities |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | 270 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember |  | (154)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember |
Impairments on AFS Securities |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | 0 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember |  | (113)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember |
Other derivative instruments, net |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | (1,374)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember |  | (5,727)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember |
Guarantee asset |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | (1,083)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_GuaranteeAssetMember |  | 0 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_GuaranteeAssetMember |
Other |  |  |  |
Other market valuation adjustments |  |  |  |
Other market valuation adjustments, net | $ 155 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherFinancingReceivableMember |  | $ (142)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherFinancingReceivableMember |
[1] | For the three months ended March 31, 2015, there were no other-than-temporary impairments. For the three months ended March 31, 2014, other-than-temporary impairments were $1,671, of which $113 were recognized through the Income Statement and $1,558 were recognized in Accumulated Other Comprehensive Income.

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- Definition The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value, as well as the credit portion of other-than-temporary impairments on securities available for sale, impairments on loans held-for-sale and real estate owned. + References No definition available. + Details
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