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Principles of Consolidation - Loan Transfers Accounted as Secured Borrowings (Detail) $ in Millions	12 Months Ended
	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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Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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- References

No definition available.

+ Details

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