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Commitments and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
loan
repurchase_request
lease
Mar. 31, 2014
Jul. 15, 2010
Plaintiff
Dec. 31, 2014
Loss Contingencies [Line Items]        
Number of noncancelable leases 9rwt_OperatingLeasesNumberOfLeasesNoncancelable      
Future lease commitments with expiration date $ 12,346,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Residential repurchase reserve 4,292,000rwt_MortgageLoanOnRealEstateRepurchaseReserve     3,724,000rwt_MortgageLoanOnRealEstateRepurchaseReserve
Residential repurchase provisions recorded 1,000,000rwt_MortgageLoansOnRealEstateRepurchaseProvision 1,000,000rwt_MortgageLoansOnRealEstateRepurchaseProvision    
Residential repurchase requests 25rwt_MortgageLoansOnRealEstateRepurchaseRequests      
Resdential repurchase, number of loans repurchased 1rwt_MortgageLoansOnRealEstateNumberOfLoansRepurchased      
Aggregate amount of loss contingency reserves 2,000,000us-gaap_LitigationReserve     2,000,000us-gaap_LitigationReserve
Schwab        
Loss Contingencies [Line Items]        
Number of other named defendants along with SRF     26us-gaap_LossContingencyNumberOfDefendants
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= rwt_CharlesSchwabCorporationMember
 
Maximum        
Loss Contingencies [Line Items]        
Operating lease expiration dates 2021      
Operating lease expense (less than) 1,000,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
0us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Sequoia | FHLB Seattle | Residential        
Loss Contingencies [Line Items]        
Statutory interest rate per annum 8.00%rwt_PercentageInterestPlaintiff
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= us-gaap_FederalHomeLoanBankOfSeattleMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
     
Original principal amount of securities 133,000,000us-gaap_DebtInstrumentFaceAmount
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= us-gaap_FederalHomeLoanBankOfSeattleMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
     
Debt instrument principal payment amount 116,000,000us-gaap_RepaymentsOfBankDebt
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= us-gaap_FederalHomeLoanBankOfSeattleMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
     
Debt instrument interest payment amount 11,000,000rwt_DebtInstrumentUnpaidInterestPaidByCash
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= us-gaap_FederalHomeLoanBankOfSeattleMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
     
Sequoia | Schwab | Residential        
Loss Contingencies [Line Items]        
Original principal amount of securities 15,000,000us-gaap_DebtInstrumentFaceAmount
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= rwt_CharlesSchwabCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
     
Principal balance of securities 13,000,000rwt_DebtInstrumentAggregatePrincipalAmount
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= rwt_CharlesSchwabCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember
     
Debt instrument interest amount $ 1,000,000rwt_DebtInstrumentAccruedInterest
/ rwt_LossContingenciesByNameOfPlaintiffAxis
= rwt_CharlesSchwabCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember