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Other Assets and Liabilities - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Other Assets and Other Liabilities [Line Items] |  |
Real estate owned (REO) | $ 5,305,000 us-gaap_RealEstateAcquiredThroughForeclosure | $ 4,391,000 us-gaap_RealEstateAcquiredThroughForeclosure
Amount related to transfers into REO | 3,000,000 us-gaap_RealEstateAcquisitionsThroughForeclosures |
REO liquidations | 1,000,000 us-gaap_RealEstateCostOfRealEstateSold |
Negative market valuation adjustments on REO | 2,000,000 us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount |
Sequoia |  |
Other Assets and Other Liabilities [Line Items] |  |
Number of REO properties recorded on balance sheet | 20 us-gaap_NumberOfRealEstateProperties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 22 us-gaap_NumberOfRealEstateProperties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Guarantee obligations |  |
Other Assets and Other Liabilities [Line Items] |  |
Unpaid principal amount on loans | 957,000,000 us-gaap_PrincipalAmountOutstandingOnLoansSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Weighted average original Fair Isaac Corporation (FICO) score | 762 rwt_FinancingReceivableCreditScoreFICOWeightedAverage / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Weighted average original loan-to-value (LTV) | 75.00%rwt_FinancingReceivableLoanToValueRatio / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Percent of loans in reference portfolio that are in foreclosure | 0.00%rwt_FinancingReceivablePercentInForeclosure / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Potential future payments on loans | 10,000,000 rwt_PotentialFuturePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Loans and Leases Receivable, Allowance | $ 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Guarantee obligations | Financing Receivables, Equal To Greater Than 30 Days Past Due |  |
Other Assets and Other Liabilities [Line Items] |  |
Percent of loans in reference portfolio that are past due | 0.44%rwt_FinancingReceivablePercentPastDue / rwt_FinancingReceivablesPeriodPastDueAxis = rwt_FinancingReceivablesEqualToGreaterThan30DaysPastDueMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Guarantee obligations | Financing Receivables, Equal to Greater than 90 Days Past Due |  |
Other Assets and Other Liabilities [Line Items] |  |
Percent of loans in reference portfolio that are past due | 0.00%rwt_FinancingReceivablePercentPastDue / rwt_FinancingReceivablesPeriodPastDueAxis = rwt_FinancingReceivablesEqualtoGreaterthan90DaysPastDueMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |

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- Definition The weighted average FICO score for borrowers at the time loans were originated. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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