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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) (Residential, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Residential
  
Credit Reserve  
Beginning balance $ 70,067rwt_AvailableForSaleSecuritiesCreditReserve
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Amortization of net discount 0rwt_AvailableForSaleSecuritiesCreditReserveAmortizationOfNetDiscountPremium
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Realized credit losses (2,945)rwt_AvailableForSaleSecuritiesCreditReserveRealizedCreditGainsLosses
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Acquisitions 0rwt_AvailableForSaleSecuritiesCreditReserveAcquisitions
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Sales, calls, other 0rwt_AvailableForSaleSecuritiesCreditReserveSalesCallsOther
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Impairments 0rwt_AvailableForSaleSecuritiesCreditReserveImpairments
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Transfers to (release of) credit reserves, net (3,538)rwt_AvailableForSaleSecuritiesCreditReserveTransfersToReleaseOfCreditReserves
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Ending Balance 63,584rwt_AvailableForSaleSecuritiesCreditReserve
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Unamortized Discount Net  
Beginning balance 296,342rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiums
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Amortization of net discount (9,838)rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAmortizationOfNetDiscountPremium
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Realized credit losses 0rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsRealizedCreditGainsLosses
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Acquisitions 2,672rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAcquisitions
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Sales, calls, other (6,332)rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsSalesCallsOther
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Impairments 0rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsImpairments
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Transfers to (release of) credit reserves, net 3,538rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsTransfersToReleaseOfCreditReserves
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Ending Balance $ 286,382rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiums
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember