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Other Assets and Accrued Expense and Other Liabilities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Assets and Other Liabilities [Line Items]    
Unpaid principal balance on loans $ 986,000,000us-gaap_PrincipalAmountOutstandingOnLoansSecuritized  
Potential future payments of loans 10,000,000rwt_PotentialFuturePayments  
Real estate owned (REO) 4,391,000us-gaap_RealEstateAcquiredThroughForeclosure 3,661,000us-gaap_RealEstateAcquiredThroughForeclosure
Amount related to transfers into REO 7,000,000us-gaap_RealEstateAcquisitionsThroughForeclosures  
REO liquidations 5,000,000us-gaap_RealEstateCostOfRealEstateSold  
Maximum    
Other Assets and Other Liabilities [Line Items]    
Reduction related to deconsolidation $ 1,000,000us-gaap_RealEstateOtherDeductions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Sequoia    
Other Assets and Other Liabilities [Line Items]    
Number of REO properties recorded on balance sheet 22us-gaap_NumberOfRealEstateProperties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember		 20us-gaap_NumberOfRealEstateProperties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember