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Real Estate Securities - Available for Sale Securities by Collateral Type (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 1,178,406 us-gaap_AvailableForSaleSecurities | $ 1,267,624 us-gaap_AvailableForSaleSecurities
Senior Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 472,746 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 487,557 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 297,872 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 307,813 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 174,874 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 179,744 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Re-REMIC |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 169,239 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember | 168,347 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 536,421 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember | 611,720 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember
Subordinate Securities | Prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 370,391 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember | 448,838 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember
Subordinate Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 1,000 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember | 1,000 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember
Subordinate Securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 166,030 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = rwt_SubordinateMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember | $ 162,882 us-gaap_AvailableForSaleSecurities / invest_InvestmentSecuritiesClassAxis = rwt_SubordinateMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember

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