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Commercial Loans - Commercial Loans Collectively Evaluated for Impairment (Details) - Commercial Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Principal balance	$ 328,925	$ 341,750
Recorded investment	324,646	336,888
Related allowance	$ 7,341	$ 7,457

X

- Definition

The principal balance of financing receivables that were collectively evaluated for impairment.

+ References

No definition available.

+ Details

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Namespace Prefix:	rwt_
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Balance Type:	debit
Period Type:	instant

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 11B



-Subparagraph (g)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 11B



-Subparagraph (h)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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