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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
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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 | $ 1,104 us-gaap_LoansHeldForSaleFairValueDisclosure | $ 1,145 us-gaap_LoansHeldForSaleFairValueDisclosure
REO | 2,069 us-gaap_OtherAssetsFairValueDisclosure | 1,518 us-gaap_OtherAssetsFairValueDisclosure
Guarantee obligation | 7,201 us-gaap_GuaranteesFairValueDisclosure |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |
Residential loans, at lower of cost or fair value | 1,104 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,145 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
REO | 2,069 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,518 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Guarantee obligation | 7,201 us-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

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- Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Fair value portion of other assets. + References No definition available. + Details
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Balance Type: | debit
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