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Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Residential Loans Held For Sale |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember
Residential Loans Held For Sale | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 39.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_CA | 44.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_CA
Residential Loans Held For Sale | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_TX | 7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_TX
Residential Loans Held For Sale | Massachusetts |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_MA | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_MA
Residential Loans Held For Sale | Virginia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_VA | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_VA
Residential Loans Held For Sale | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_WA | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_WA
Residential Loans Held For Sale | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_FL |
Residential Loans Held For Sale | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_NY | 3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_NY
Residential Loans Held For Sale | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_GA | 1.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_GA
Residential Loans Held For Sale | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember | 29.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember
Residential Loans Held for Investment |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember
Residential Loans Held for Investment | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_CA | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_CA
Residential Loans Held for Investment | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_TX | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_TX
Residential Loans Held for Investment | Massachusetts |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_MA |
Residential Loans Held for Investment | Virginia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_VA |
Residential Loans Held for Investment | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_WA |
Residential Loans Held for Investment | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_FL | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_FL
Residential Loans Held for Investment | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_NY | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_NY
Residential Loans Held for Investment | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_GA | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_GA
Residential Loans Held for Investment | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 42.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember | 48.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember
Residential Loans Held For Investment at Fair Value |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |
Residential Loans Held For Investment at Fair Value | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 24.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_CA |
Residential Loans Held For Investment at Fair Value | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_TX |
Residential Loans Held For Investment at Fair Value | Massachusetts |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_MA |
Residential Loans Held For Investment at Fair Value | Virginia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_VA |
Residential Loans Held For Investment at Fair Value | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_WA |
Residential Loans Held For Investment at Fair Value | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_FL |
Residential Loans Held For Investment at Fair Value | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_NY |
Residential Loans Held For Investment at Fair Value | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = stpr_CO |
Residential Loans Held For Investment at Fair Value | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 29.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember |

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