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Long-Term Debt - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2010
Dec. 31, 2013
Dec. 31, 2006
Jul. 31, 2009
Dec. 31, 2007
Nov. 30, 2014
Debt Instrument [Line Items]                
Federal home loan bank stock   $ 10,688,000us-gaap_FederalHomeLoanBankStock            
Convertible notes 288,000,000us-gaap_ConvertibleNotesPayable              
Debt instrument interest rate 4.625%us-gaap_DebtInstrumentInterestRateStatedPercentage              
Debt instrument maturity year 2018              
Debt instrument redemption date Apr. 15, 2018              
Net proceeds from issuance of convertible debt 279,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts              
Interest expense yield   5.45%us-gaap_DebtInstrumentInterestRateDuringPeriod            
Accrued interest payable   1,900,000us-gaap_InterestPayableCurrent            
Convertible senior notes conversion rate   41.1320us-gaap_DebtInstrumentConvertibleConversionRatio1            
Debt instrument convertible base principal amount of conversion   1,000rwt_DebtInstrumentConvertibleBasePrincipalAmountOfConversion            
Convertible senior notes conversion per share   $ 24.31us-gaap_DebtInstrumentConvertibleConversionPrice1            
Accrued interest payable balance on long-term debt   8,502,000us-gaap_InterestPayableCurrentAndNoncurrent   6,366,000us-gaap_InterestPayableCurrentAndNoncurrent        
FHLB Chicago                
Debt Instrument [Line Items]                
Federal home loan bank advances   496,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfChicagoMember
           
Weighted average interest rate   0.29%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfChicagoMember
           
Weighted average maturity   9 years 4 months 24 days            
Federal home loan bank advances, Maturity period, Rate   91 days            
Federal home loan bank stock   11,000,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfChicagoMember
           
Residential Loans Held For Investment at Fair Value | FHLB Chicago                
Debt Instrument [Line Items]                
Amount on advances secured by residential mortgage loans   580,000,000us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfChicagoMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansHeldForInvestmentAtFairValueMember
           
Maximum                
Debt Instrument [Line Items]                
Accrued interest payable       1,000,000us-gaap_InterestPayableCurrent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Commercial Secured Borrowings                
Debt Instrument [Line Items]                
Commercial mortgage loans   67,000,000us-gaap_PledgedAssetsSeparatelyReportedMortgageRelatedSecuritiesAvailableForSaleOrHeldForInvestment
/ us-gaap_DebtInstrumentAxis
= rwt_CommercialSecuredLoanMember
           
Senior Notes due 2018                
Debt Instrument [Line Items]                
Accrued interest payable   3,200,000us-gaap_InterestPayableCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
           
Unamortized deferred issuance costs   5,800,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
           
Trust Preferred Securities                
Debt Instrument [Line Items]                
Interest expense yield   2.58%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
  2.64%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
       
Debt instrument face amount         100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
     
Debt instrument quarterly floating coupon rate basis         Three-month LIBOR plus 2.25%      
Debt instrument quarterly floating coupon rate         2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
     
Debt instrument due date         Jan. 30, 2037      
Percentage of yield of debt securities   6.88%rwt_DebtInstrumentAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
  6.90%rwt_DebtInstrumentAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
       
Earliest optional redemption date without penalty   Jan. 30, 2012            
Principal amount of debt repurchased     500,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= rwt_TrustPreferredSecuritiesMember
         
Subordinated Notes                
Debt Instrument [Line Items]                
Interest expense yield   2.58%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
  2.64%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Debt instrument face amount             50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
 
Debt instrument quarterly floating coupon rate basis             Three-month LIBOR plus 2.25%  
Debt instrument quarterly floating coupon rate             2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
 
Debt instrument due date             Jul. 30, 2037  
Percentage of yield of debt securities   6.88%rwt_DebtInstrumentAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
  6.90%rwt_DebtInstrumentAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
       
Earliest optional redemption date without penalty   Jul. 30, 2012            
Principal amount of debt repurchased           10,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Long-term Debt | Maximum                
Debt Instrument [Line Items]                
Accrued interest payable balance on long-term debt   1,000,000us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  1,000,000us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Exchangeable Notes                
Debt Instrument [Line Items]                
Convertible notes               205,000,000us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
Debt instrument interest rate               5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
Debt instrument maturity year               2019
Debt instrument redemption date               Nov. 15, 2019
Net proceeds from issuance of convertible debt               198,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
Interest expense yield   6.41%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
           
Accrued interest payable   1,200,000us-gaap_InterestPayableCurrent
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
           
Unamortized deferred issuance costs   6,800,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
           
Convertible senior notes conversion rate   46.1798us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
           
Debt instrument convertible base principal amount of conversion   $ 1,000rwt_DebtInstrumentConvertibleBasePrincipalAmountOfConversion
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember
           
Convertible senior notes conversion per share   $ 21.65us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= rwt_ExchangeableSeniorNotesMember