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Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Servicing Assets at Fair Value [Line Items]

Balance at beginning of period

$ 64,824us-gaap_ServicingAssetAtFairValueAmount

$ 5,315us-gaap_ServicingAssetAtFairValueAmount

Additions

48,000us-gaap_ServicingAssetAtFairValueAdditions

44,063us-gaap_ServicingAssetAtFairValueAdditions

7,329us-gaap_ServicingAssetAtFairValueAdditions

Balance at End of Period

139,293us-gaap_ServicingAssetAtFairValueAmount

64,824us-gaap_ServicingAssetAtFairValueAmount

5,315us-gaap_ServicingAssetAtFairValueAmount

Mortgage Servicing Rights

Servicing Assets at Fair Value [Line Items]

Balance at beginning of period

64,824us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

5,315us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

Additions

95,550us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

47,514us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

Changes in assumptions

(12,467)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

^[1]

15,719us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

^[1]

Other changes

(8,614)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

^[2]

(3,724)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

^[2]

Balance at End of Period

$ 139,293us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

$ 64,824us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_InvestmentTypeAxis
= rwt_MortgageServicingRightsMember

[1]	Primarily reflects changes in prepayment assumptions due to changes in market interest rates.
[2]	Represents changes due to realization of expected cash flows.

X

- Definition

The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing 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)(4)(i)

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

Name:	us-gaap_ServicingAssetAtFairValueAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ 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)(1)

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

+ Details

Name:	us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing 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)(4)(ii)

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

+ Details

Name:	us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rwt_MortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: