Other Assets and Liabilities - Schedule of Activity of Real Estate Owned (REO) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Other Real Estate [Roll Forward]
Balance at beginning of year	$ 91,927	$ 93,599
Transfers to REO	144,759	22,554
Liquidations	(77,468)	(8,514)
Deconsolidation	(2,489)
Changes in fair value, net	(32,459)	(15,712)
Balance at End of Year	124,270	91,927
Securitized Re-Performing Loans
Other Real Estate [Roll Forward]
Balance at beginning of year	2,987	3,158
Transfers to REO	2,449	2,887
Liquidations	(4,070)	(3,557)
Deconsolidation	(2,489)
Changes in fair value, net	1,123	499
Balance at End of Year	0	2,987
CAFL Securitized Term Loans
Other Real Estate [Roll Forward]
Balance at beginning of year	11,262	2,684
Transfers to REO	12,155	8,582
Liquidations	(3,514)	(4)
Deconsolidation	0
Changes in fair value, net	0	0
Balance at End of Year	19,903	11,262
Bridge Loan \| Bridge Loans
Other Real Estate [Roll Forward]
Balance at beginning of year	77,678	87,757
Transfers to REO	128,171	11,085
Liquidations	(69,884)	(4,953)
Deconsolidation	0
Changes in fair value, net	(33,582)	(16,211)
Balance at End of Year	102,383	77,678
Bridge Loan \| Sequoia Securitized Loans
Other Real Estate [Roll Forward]
Balance at beginning of year	0	0
Transfers to REO	1,984	0
Liquidations	0	0
Deconsolidation	0
Changes in fair value, net	0	0
Balance at End of Year	$ 1,984	$ 0

Real Estate Companies, Investment In Real Estate, Deconsolidation Adjustments

No definition available.

Name:	rwt_RealEstateCompaniesInvestmentInRealEstateDeconsolidationAdjustments
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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.

+ Details

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

- Definition

Amount of realized and unrealized gain (loss), from the firm's direct investment activity, conducted separately from customer trading activities, and includes, but is not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(h))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(g))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_PrincipalInvestmentGainsLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11

+ Details

Name:	us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of real estate investments acquired through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column E)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

+ Details

Name:	us-gaap_RealEstateAcquisitionsThroughForeclosures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

+ Details

Name:	us-gaap_RealEstateCostOfRealEstateSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_RealEstateOwnedSecuritizedRePerformingLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_RealEstateOwnedTermSecuritizedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_RealEstateOwnedUnsecuritizedBridgeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_RealEstateOwnedUnsecuritizedSequoiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: