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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
Investment Holdings [Line Items]    
Available-for-sale securities $ 1,178,406us-gaap_AvailableForSaleSecurities $ 1,267,624us-gaap_AvailableForSaleSecurities
Senior Securities    
Investment Holdings [Line Items]    
Available-for-sale securities 472,746us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember		 487,557us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember
Senior Securities | Prime    
Investment Holdings [Line Items]    
Available-for-sale securities 297,872us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember		 307,813us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember
Senior Securities | Non-prime    
Investment Holdings [Line Items]    
Available-for-sale securities 174,874us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember		 179,744us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember
Re-REMIC    
Investment Holdings [Line Items]    
Available-for-sale securities 169,239us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember		 168,347us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember
Subordinate Securities    
Investment Holdings [Line Items]    
Available-for-sale securities 536,421us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember		 611,720us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember
Subordinate Securities | Prime    
Investment Holdings [Line Items]    
Available-for-sale securities 370,391us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember		 448,838us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember
Subordinate Securities | Non-prime    
Investment Holdings [Line Items]    
Available-for-sale securities 1,000us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember		 1,000us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember
Subordinate Securities | Subordinate    
Investment Holdings [Line Items]    
Available-for-sale securities $ 166,030us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= rwt_SubordinateMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember		 $ 162,882us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= rwt_SubordinateMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember