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Commercial Loans - Summary of Activity in Allowance for Commercial Loan Losses (Details) - Commercial Loans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 7,401	$ 8,317	$ 7,456	$ 7,373
Charge-offs, net	0	0	0	0
Provision for loan losses	(60)	(888)	(115)	56
Balance at End of Period	$ 7,341	$ 7,429	$ 7,341	$ 7,429

X

- Definition

Provision Reversal for Loan, Lease, and Other Losses

+ References

No definition available.

+ Details

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Namespace Prefix:	rwt_
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Balance Type:	debit
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X

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 310



-Section 45



-Paragraph 4



-URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488

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X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ 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 (c)(3)



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



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.7(d))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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