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Real Estate Securities - Summary of Significant Valuation Assumptions for Available for Sale Securities Credit Loss (Details) - Subordinate Securities	3 Months Ended
	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Prepayment rate	12.00%
Default rate	0.50%
Loss severity	20.00%

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_
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Balance Type:	na
Period Type:	instant

X

- Definition

Debt Securities, Available-for-sale, Allowance for Credit Loss, Qualitative Disclosures, Default Rate

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Debt Securities, Available-for-sale, Allowance for Credit Loss, Qualitative Disclosures, Severity

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

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