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Mortgage Banking Activities - Components of Mortgage Banking Activities, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Adjustment to valuation of trading securities	$ (14,359)us-gaap_IncreaseDecreaseInTradingSecurities	$ (4,277)us-gaap_IncreaseDecreaseInTradingSecurities
Risk management derivatives	(10,583)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet	(7,082)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet
Mortgage banking activities, net	1,923rwt_MortgageBankingActivitiesNet	(231)rwt_MortgageBankingActivitiesNet
Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Mortgage banking activities, net	1,923rwt_MortgageBankingActivitiesNet / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	(231)rwt_MortgageBankingActivitiesNet / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Mortgage Banking Activities | Residential Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Valuation adjustments	20,312us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	7,045us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Adjustment to valuation of trading securities	(14,359)us-gaap_IncreaseDecreaseInTradingSecurities / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	(4,277)us-gaap_IncreaseDecreaseInTradingSecurities / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Risk management derivatives	(4,371)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	(4,278)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Other	633us-gaap_FeesAndCommissionsOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	446us-gaap_FeesAndCommissionsOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Mortgage banking activities, net	2,215rwt_MortgageBankingActivitiesNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	(1,064)rwt_MortgageBankingActivitiesNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Mortgage Banking Activities | Commercial Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Valuation adjustments	5,857us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	3,626us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Risk management derivatives	(6,212)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	(2,803)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Other	63us-gaap_FeesAndCommissionsOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	10us-gaap_FeesAndCommissionsOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember
Mortgage banking activities, net	$ (292)rwt_MortgageBankingActivitiesNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember	$ 833rwt_MortgageBankingActivitiesNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialMortgageBankingActivitiesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageBankingActivitiesMember

X

- Definition

The aggregate net change in market value for derivative instruments associated with mortgage banking activities.

+ References

No definition available.

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- Definition

The net income attributable to mortgage banking activities. This includes market valuations related to residential and commercial loans, Sequoia IOs, and mortgage banking derivatives, as well as realized gains or losses associated with mortgage loan sales.

+ References

No definition available.

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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- Definition

Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

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- Definition

Amount of increase (decrease) in the fair value of equity or debt securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3444-108585

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