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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 | $ 3,399,755 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer |  | $ 3,398,573 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer |
Commercial loans | 460,342 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial |  | 566,927 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial |
Real estate securities | 1,285,243 us-gaap_MarketableSecurities | [1] | 1,379,230 us-gaap_MarketableSecurities | [1]
Mortgage servicing rights | 120,324 us-gaap_ServicingAssetAtFairValueAmount | [1] | 139,293 us-gaap_ServicingAssetAtFairValueAmount | [1]
Total assets | 5,816,019 us-gaap_Assets | [1] | 5,918,966 us-gaap_Assets | [1]
Operating Segments | Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans | 1,094,885 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 1,342,519 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |
Commercial loans | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |
Real estate securities | 65,809 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 93,802 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |
Mortgage servicing rights | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |
Total assets | 1,204,055 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 1,468,856 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |
Operating Segments | Residential Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans | 1,000,444 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 581,668 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |
Commercial loans | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |
Real estate securities | 1,219,434 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 1,285,428 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |
Mortgage servicing rights | 120,324 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 139,293 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |
Total assets | 2,446,100 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 2,057,256 us-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 | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |
Commercial loans | 460,342 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 566,927 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |
Real estate securities | 0 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 0 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |
Mortgage servicing rights | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |
Total assets | 467,200 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 575,943 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |
Corporate/Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans | 1,304,426 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
Commercial loans | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
Real estate securities | 0 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 0 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
Mortgage servicing rights | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
Total assets | $ 1,698,664 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | $ 1,816,911 us-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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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