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Real Estate Securities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Investment | Dec. 31, 2013 Investment | Dec. 31, 2012
Investment Holdings [Line Items] |  |  |
Trading securities | $ 111,606,000 us-gaap_TradingSecurities | $ 124,555,000 us-gaap_TradingSecurities |
Number of AFS securities | 290 rwt_NumberOfAvailableForSaleSecurities | 303 rwt_NumberOfAvailableForSaleSecurities |
Number of securities in unrealized loss position | 31 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 | 76 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 |
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | 10 rwt_NumberOfSecuritiesContinuousUnrealizedLossPositionMoreThanTwelveMonths | 5 rwt_NumberOfSecuritiesContinuousUnrealizedLossPositionMoreThanTwelveMonths |
Gross unrealized losses on AFS securities | 3,000,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |  |
Other than temporary impairment loss on AFS securities | 5,000,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities |  |
Other market valuation adjustments | (10,146,000)rwt_OtherMarketValuationAdjustments | (5,709,000)rwt_OtherMarketValuationAdjustments | 1,539,000 rwt_OtherMarketValuationAdjustments
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Marketable securities, due from five to ten years | 2,000,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |  |
Marketable securities, less than five years | 8,000,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |  |
Interest Only Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 96,000,000 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_InterestOnlySecuritiesMember |  |
Senior Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 101,753,000 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 119,575,000 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember |
Senior Securities | Trading Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 6,000 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = rwt_TradingSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember |  |
Senior Securities | Prime |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 93,802,000 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 110,505,000 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember |
Securities financed through non-recourse resecuritization entity | 105,000,000 rwt_SecuritiesFinancedThroughNonrecourseResecuritization / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 131,000,000 rwt_SecuritiesFinancedThroughNonrecourseResecuritization / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember |
Senior Securities | Non-prime |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 7,951,000 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 9,070,000 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember |
Securities financed through non-recourse resecuritization entity | 117,000,000 rwt_SecuritiesFinancedThroughNonrecourseResecuritization / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 132,000,000 rwt_SecuritiesFinancedThroughNonrecourseResecuritization / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember |
Residential Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 10,000,000 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_ResidentialSubordinateSecuritiesMember |  |
Residential Subordinate Securities | Trading Securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 21,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentSecuritiesClassAxis = rwt_TradingSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_ResidentialSubordinateSecuritiesMember |  |
Residential Senior and Subordinate Securities | Trading Securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 6,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / invest_InvestmentSecuritiesClassAxis = rwt_TradingSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_ResidentialSeniorSecuritiesMember |  |
Available-for-sale Securities |  |  |
Investment Holdings [Line Items] |  |  |
Other market valuation adjustments | $ 1,000,000 rwt_OtherMarketValuationAdjustments / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember |  |

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- Definition The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value and impairments on loans held-for-sale and real estate owned. This excludes valuation adjustments recorded in Mortgage Banking Activities, Net. + References No definition available. + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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