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Components of Carrying Value of Residential Available for Sale Securities in Unrealized Loss Position (Detail) (Residential, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Residential
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Consecutive Months Amortized Cost	$ 126,681rwt_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	$ 607,030rwt_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Less Than 12 Consecutive Months Gross Unrealized Losses	(1,374)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	(21,195)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Less Than 12 Consecutive Months Fair Value	125,307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	585,835us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
12 Consecutive Months or Longer Amortized Cost	70,676rwt_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	19,828rwt_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
12 Consecutive Months or Longer Gross Unrealized Losses	(1,422)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	(1,938)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
12 Consecutive Months or Longer Fair Value	$ 69,254us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	$ 17,890us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember

X

- Definition

This item represents the amortized cost basis of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

Name:	rwt_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the amortized cost basis of securities that have been in a loss position for twelve months or longer for those securities which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

Name:	rwt_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

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

+ Details

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

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

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

+ Details

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

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(1)

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

+ Details

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

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(1)

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

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Balance Type:	na
Period Type:	duration