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Geographic Concentrate of Commercial Loans Recorded on Consolidated Balance Sheet (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Commercial Loans Held For Sale |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember
Commercial Loans Held For Investment |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember
Other states | Commercial Loans Held For Sale |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember |
Other states | Commercial Loans Held For Investment |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 32.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember | 29.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember
Maximum | Other states | Commercial Loans Held For Sale |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember
Maximum | Other states | Commercial Loans Held For Investment |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember

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