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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | $ 15,675 us-gaap_ServicingAssetAtFairValueAdditions | $ 2,294 us-gaap_ServicingAssetAtFairValueAdditions
Mortgage Servicing Rights |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 18,754 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 2,858 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Associated Principal | 1,908,993 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Jumbo MSR Additions |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 1,964 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember |
Associated Principal | 237,997 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember |
Mortgage Servicing Rights | Jumbo MSR Additions | Securitization |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 1,872 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember |
Associated Principal | 227,852 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember |
Mortgage Servicing Rights | Jumbo MSR Additions | Loan Sales |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 92 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember |
Associated Principal | 10,145 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember |
Mortgage Servicing Rights | Conforming MSR Additions |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 16,790 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember |
Associated Principal | 1,670,996 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember |
Mortgage Servicing Rights | Conforming MSR Additions | Loan Sales |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 13,711 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember |
Associated Principal | 1,352,658 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember |
Mortgage Servicing Rights | Conforming MSR Additions | From purchases |  |
Mortgage Servicing Rights [Line Items] |  |
MSR Fair Value | 3,079 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember |
Associated Principal | $ 318,338 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember |

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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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