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Loan Transfers Accounted as Secured Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014
Loan Transferred As Secured Borrowings [Line Items] |  |
Principal balance |  | $ 63,375
Cash proceeds |  | $ 65,048

X
- Definition Loan Transferred As Secured Borrowings Cash Proceeds + References No definition available. + Details
Name: | rwt_LoanTransferredAsSecuredBorrowingsCashProceeds
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | rwt_LoanTransferredAsSecuredBorrowingsLineItems
Namespace Prefix: | rwt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan Transferred As Secured Borrowings Principal Balance + References No definition available. + Details
Name: | rwt_LoanTransferredAsSecuredBorrowingsPrincipalBalance
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration