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Real Estate Securities - Summary of Significant Valuation Assumptions for Available for Sale Securities (Detail)	3 Months Ended
	Mar. 31, 2016
Prime | Minimum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	10.00%
Projected default rate	0.00%
Prime | Maximum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	20.00%
Projected default rate	9.00%
Non-prime
Schedule of Available-for-sale Securities [Line Items]
Projected default rate	5.00%
Non-prime | Minimum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	12.00%
Non-prime | Maximum
Schedule of Available-for-sale Securities [Line Items]
Prepayment rates	15.00%

X

- Definition

This item represents a significant valuation assumption on prepayment rates, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

No definition available.

+ Details

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Namespace Prefix:	rwt_
Data Type:	num:percentItemType
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Period Type:	instant

X

- Definition

This item represents the default rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

+ Details

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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.

+ Details

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- Details

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