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Subsequent Events - Additional Information (Detail) (Residential Loans, USD $) In Millions, unless otherwise specified | 2 Months Ended |
--- | --- | ---
Feb. 22, 2015 | Dec. 31, 2014
Subsequent Event [Line Items] |  |
Amount of loans planned to be purchased |  | $ 848 rwt_AmountOfLoansExpectedToBePurchased
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Residential mortgage loans closed and purchased | $ 481 us-gaap_PaymentsToPurchaseMortgageLoansHeldForSale / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Amount of Loans Expected to be Purchased + References No definition available. + Details
Name: | rwt_AmountOfLoansExpectedToBePurchased
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash outflow used to purchase loans that are secured with real estate mortgage and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=34726456&loc=d3e60097-112785 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
Name: | us-gaap_PaymentsToPurchaseMortgageLoansHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration