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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)	$ 5,305,000us-gaap_RealEstateAcquiredThroughForeclosure	$ 4,391,000us-gaap_RealEstateAcquiredThroughForeclosure
Amount related to transfers into REO	3,000,000us-gaap_RealEstateAcquisitionsThroughForeclosures
REO liquidations	1,000,000us-gaap_RealEstateCostOfRealEstateSold
Negative market valuation adjustments on REO	2,000,000us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount
Sequoia
Other Assets and Other Liabilities [Line Items]
Number of REO properties recorded on balance sheet	20us-gaap_NumberOfRealEstateProperties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	22us-gaap_NumberOfRealEstateProperties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Guarantee obligations
Other Assets and Other Liabilities [Line Items]
Unpaid principal amount on loans	957,000,000us-gaap_PrincipalAmountOutstandingOnLoansSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember
Weighted average original Fair Isaac Corporation (FICO) score	762rwt_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	10,000,000rwt_PotentialFuturePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember
Loans and Leases Receivable, Allowance	$ 0us-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

X

- Definition

The weighted average FICO score for borrowers at the time loans were originated.

+ References

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Financing Receivable, Loan To Value Ratio

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- Definition

Financing Receivable, Percent In Foreclosure

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- Definition

Percent of financing receivables past due.

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- Definition

Potential Future Payments

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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

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-SubTopic 10

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- Definition

The number of real estate properties owned as of the balance sheet date.

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- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

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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.

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Amount of real estate investments acquired through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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