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Geographic Concentrate of Commercial Loans Recorded on Consolidated Balance Sheet (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 Sale | DISTRICT OF COLUMBIA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 25.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_DC |
Commercial Loans Held For Sale | Michigan |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_MI |
Commercial Loans Held For Sale | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_CO |
Commercial Loans Held For Sale | Connecticut |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_CT |
Commercial Loans Held For Sale | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_TX |
Commercial Loans Held For Sale | MARYLAND |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_MD |
Commercial Loans Held For Sale | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_CA |
Commercial Loans Held For Sale | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 39.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_NY
Commercial Loans Held For Sale | NORTH CAROLINA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_NC
Commercial Loans Held For Sale | New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_NJ
Commercial Loans Held For Sale | OHIO |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_OH
Commercial Loans Held For Sale | INDIANA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_IN
Commercial Loans Held For Sale | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = stpr_IL
Commercial Loans Held For Sale | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember / us-gaap_StatementGeographicalAxis = rwt_OtherStateMember |
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
Commercial Loans Held For Investment | Michigan |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_MI | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_MI
Commercial Loans Held For Investment | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_TX
Commercial Loans Held For Investment | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_CA | 21.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_CA
Commercial Loans Held For Investment | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_FL | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_FL
Commercial Loans Held For Investment | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_NY | 19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_NY
Commercial Loans Held For Investment | NORTH CAROLINA |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_NC |
Commercial Loans Held For Investment | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_StatementGeographicalAxis = stpr_IL
Commercial Loans Held For Investment | Other states |  |
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

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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