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Summary of Classifications and Carrying Value of Residential Loans (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | $ 3,398,573 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer | $ 2,166,434 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer | $ 2,835,470 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Residential Loans at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,340,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember | 403,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |
Residential Loans at Fair Value | Conforming Loan |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 244,714 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember | 11,502 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |
Residential Loans at Fair Value | Jumbo Loan |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,096,317 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember | 391,100 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |
Residential Loans at Lower of Cost or Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,488 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 1,665 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 581,668 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |  |
Residential Loans Held For Investment At Amortized Cost |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember | 1,762,167 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember |
Redwood |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,924,187 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 404,267 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember |
Redwood | Residential Loans at Fair Value | Conforming Loan |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 244,714 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 11,502 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember |
Redwood | Residential Loans at Fair Value | Jumbo Loan |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,096,317 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 391,100 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember |
Redwood | Residential Loans at Lower of Cost or Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,488 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 1,665 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember |
Redwood | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 581,668 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember |  |
Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,762,167 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Sequoia | Residential Loans Held For Investment At Amortized Cost |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Residential loans | $ 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | $ 1,762,167 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |

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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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