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Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Variable Interest Entity [Line Items]
MSRs recognized			$ 30,962	$ 41,128
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Principal balance of loans transferred	635,608	1,210,604	982,913	5,253,314
MSRs recognized	4,356	12,514	6,542	41,128
Variable Interest Entity, Not Primary Beneficiary | Trading Securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	1,680	8,702	71,243	100,552
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 39,330	$ 71,527	$ 59,757	$ 278,622

X

- Definition

Principal Amount Of Loans Securitized During Period

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Securities Retained At Fair Value During Period

+ References

No definition available.

+ Details

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Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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Period Type:	duration

X

- Details

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Balance Type:	na
Period Type:	duration