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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	$ 1,882us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	$ 1,516us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	$ 1,494us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember
New deferrals	575rwt_DeferredCompensationArrangementWithIndividualNewDeferrals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	656rwt_DeferredCompensationArrangementWithIndividualNewDeferrals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	839rwt_DeferredCompensationArrangementWithIndividualNewDeferrals / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember
Accrued interest	70rwt_DeferredCompensationArrangementWithIndividualAccruedInterest / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	58rwt_DeferredCompensationArrangementWithIndividualAccruedInterest / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	44rwt_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	$ 2,049us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	$ 1,882us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_TitleOfIndividualAxis = rwt_ExecutiveDeferredCompensationPlanMember	$ 1,516us-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

X

- 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