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Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Detail)	12 Months Ended
	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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- 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

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