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Summary of Activity Related to Executive Deferred Compensation Plan (Detail) (Executive Deferred Compensation Plan, USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Executive Deferred Compensation Plan |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Balance at beginning of period | $ 1,882 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | $ 1,516 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | $ 1,494 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember
New deferrals | 575 rwt_DeferredCompensationArrangementWithIndividualNewDeferrals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | 656 rwt_DeferredCompensationArrangementWithIndividualNewDeferrals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | 839 rwt_DeferredCompensationArrangementWithIndividualNewDeferrals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember
Accrued interest | 70 rwt_DeferredCompensationArrangementWithIndividualAccruedInterest / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | 58 rwt_DeferredCompensationArrangementWithIndividualAccruedInterest / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | 44 rwt_DeferredCompensationArrangementWithIndividualAccruedInterest / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember
Withdrawals | (478)rwt_DeferredCompensationArrangementWithIndividualWithdrawals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | (348)rwt_DeferredCompensationArrangementWithIndividualWithdrawals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | (861)rwt_DeferredCompensationArrangementWithIndividualWithdrawals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember
Balance at End of Period | $ 2,049 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | $ 1,882 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember | $ 1,516 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember

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- Definition Deferred Compensation Arrangement with Individual, Accrued Interest + References No definition available. + Details
Name: | rwt_DeferredCompensationArrangementWithIndividualAccruedInterest
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deferred Compensation Arrangement with Individual, New Deferrals + References No definition available. + Details
Name: | rwt_DeferredCompensationArrangementWithIndividualNewDeferrals
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deferred Compensation Arrangement with Individual, Withdrawals + References No definition available. + Details
Name: | rwt_DeferredCompensationArrangementWithIndividualWithdrawals
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant