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Segment Information - Supplemental Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Residential loans	$ 3,399,755us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer		$ 3,398,573us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Commercial loans	460,342us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial		566,927us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Real estate securities	1,285,243us-gaap_MarketableSecurities	[1]	1,379,230us-gaap_MarketableSecurities	[1]
Mortgage servicing rights	120,324us-gaap_ServicingAssetAtFairValueAmount	[1]	139,293us-gaap_ServicingAssetAtFairValueAmount	[1]
Total assets	5,816,019us-gaap_Assets	[1]	5,918,966us-gaap_Assets	[1]
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Residential loans	1,094,885us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember		1,342,519us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Commercial loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember		0us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Real estate securities	65,809us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember		93,802us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Mortgage servicing rights	0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember		0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Total assets	1,204,055us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember		1,468,856us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Operating Segments | Residential Investments
Segment Reporting Information [Line Items]
Residential loans	1,000,444us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember		581,668us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Commercial loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember		0us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Real estate securities	1,219,434us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember		1,285,428us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Mortgage servicing rights	120,324us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember		139,293us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Total assets	2,446,100us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember		2,057,256us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Operating Segments | Commercial Mortgage Banking and Investments
Segment Reporting Information [Line Items]
Residential loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember		0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Commercial loans	460,342us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember		566,927us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Real estate securities	0us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember		0us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Mortgage servicing rights	0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember		0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Total assets	467,200us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember		575,943us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Corporate/Other
Segment Reporting Information [Line Items]
Residential loans	1,304,426us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Commercial loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		0us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Real estate securities	0us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		0us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Mortgage servicing rights	0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Total assets	$ 1,698,664us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		$ 1,816,911us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to the primary beneficiary (Redwood Trust, Inc.). At March 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,716,563 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,354,298 and $1,546,490, respectively. See Note 4 for further discussion.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Excludes loans and leases covered under loss sharing agreements.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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