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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
Residential loans, at lower of cost or fair value $ 1,103us-gaap_LoansHeldForSaleFairValueDisclosure
REO 3,410us-gaap_OtherAssetsFairValueDisclosure
Level 3
  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
Residential loans, at lower of cost or fair value 1,103us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
REO 3,410us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Residential Loans at Lower of Cost or Fair Value
  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
Gain (Loss) on assets measured at fair value on a non-recurring basis 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
REO
  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
Gain (Loss) on assets measured at fair value on a non-recurring basis $ (74)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherRealEstateOwnedMember