XML 104 R68.htm IDEA: XBRL DOCUMENT v2.4.1.9
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Residential loans, at lower of cost or fair value $ 1,104us-gaap_LoansHeldForSaleFairValueDisclosure $ 1,145us-gaap_LoansHeldForSaleFairValueDisclosure
REO 2,069us-gaap_OtherAssetsFairValueDisclosure 1,518us-gaap_OtherAssetsFairValueDisclosure
Guarantee obligation 7,201us-gaap_GuaranteesFairValueDisclosure  
Level 3
    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Residential loans, at lower of cost or fair value 1,104us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 1,145us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
REO 2,069us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 1,518us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Guarantee obligation 7,201us-gaap_GuaranteesFairValueDisclosure
/ 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 (1)us-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 $ (320)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherRealEstateOwnedMember		 $ (270)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherRealEstateOwnedMember