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Loan Transfers Accounted as Secured Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Loan Transferred As Secured Borrowings [Line Items]
Principal balance	$ 63,375rwt_LoanTransferredAsSecuredBorrowingsPrincipalBalance
Cash proceeds	$ 65,048rwt_LoanTransferredAsSecuredBorrowingsCashProceeds

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- 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