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Summary of Significant Valuation Assumptions for Available for Sale Securities (Detail)	9 Months Ended
	Sep. 30, 2014
Prime | Minimum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	15.00%
Loss severity	20.00%
Projected default rate	1.00%
Prime | Maximum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	20.00%
Loss severity	52.00%
Projected default rate	22.00%
Non-prime | Minimum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	10.00%
Loss severity	35.00%
Projected default rate	15.00%
Non-prime | Maximum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	10.00%
Loss severity	35.00%
Projected default rate	15.00%

X

- Definition

This item represents a significant valuation assumption on loss severity, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

No definition available.

+ Details

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Namespace Prefix:	rwt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents a significant valuation assumption on prepayment rates, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

No definition available.

+ Details

Name:	rwt_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosurePrepaymentRates
Namespace Prefix:	rwt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents the default rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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