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Fair Value of Financial Instruments - Portion of Net Gains (Losses) Attributable to Level 3 Assets and Liabilities Still Held Included in Net Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Loan Purchase Commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | $ 0 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember | $ (235)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Commercial Secured Borrowings |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | (1,509)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember |
Asset-backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | (2,946)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember |
Residential Loans Held For Investment at Fair Value | Residential loans at Redwood |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 5,464 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansHeldAtRedwoodMember | 3,483 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansHeldAtRedwoodMember
Residential Loans Held For Investment at Fair Value | Residential loans at consolidated Sequoia entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 1,179 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansAtConsolidatedSequoiaEntitiesMember | 0 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansAtConsolidatedSequoiaEntitiesMember
Guarantee Asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (1,083)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember | 0 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Commercial Loans at Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 2,959 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_CommercialLoansAtFairValueMember | 2,530 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_CommercialLoansAtFairValueMember
Trading Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (13,790)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember | (4,431)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Available-for-sale Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 0 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember | (113)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Mortgage Servicing Rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (11,769)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember | (2,291)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Loan Purchase Commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | $ 7,422 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember | $ 0 rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember

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