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Principles of Consolidation - Additional Information (Detail) (Variable Interest Entity, Not Primary Beneficiary)	33 Months Ended
	Sep. 30, 2014 Entity
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of securitization entities to which asset transferred	21

X

- Definition

Number of Securitization Entities to which Asset Transferred

+ References

No definition available.

+ Details

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Namespace Prefix:	rwt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration