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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 | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Residential 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 | $ 16,512 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_ResidentialLoansAtFairValueMember | $ (290)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_ResidentialLoansAtFairValueMember | $ 11,725 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_ResidentialLoansAtFairValueMember
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 | 3,357 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_CommercialLoansAtFairValueMember | 1,501 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = 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 | (25,216)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_TradingAccountAssetsMember | 32,496 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_TradingAccountAssetsMember | (14,076)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = 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 | (434)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_AvailableforsaleSecuritiesMember | (1,108)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_AvailableforsaleSecuritiesMember | (2,509)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = 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 | (15,239)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_MortgageServicingRightsMember | 14,196 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_MortgageServicingRightsMember | (1,571)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = 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 | 1,119 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_LoanPurchaseCommitmentsMember |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income |  | (379)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByMeasurementFrequencyAxis = 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 | $ 2,033 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByMeasurementFrequencyAxis = rwt_CommercialSecuredLoanMember |  |

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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