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Principles of Consolidation - Loan Transfers Accounted as Secured Borrowings (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Principal balance | $ 63
Cash proceeds | $ 65

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- Definition Loan Transferred As Secured Borrowings Cash Proceeds + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration