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Principles of Consolidation - Key Assumptions and Sensitivity Analysis for Assets Retained from Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
MSRs
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	$ 11,796	$ 10,885
Expected life (in years)	9 years	8 years
Prepayment speed assumption (annual CPR) (as a percent)	4.00%	6.00%
Decrease in fair value from:
10% adverse change	$ 177	$ 207
25% adverse change	$ 439	$ 513
Discount rate assumption	12.00%	13.00%
Decrease in fair value from:
100 basis point increase	$ 471	$ 405
200 basis point increase	900	827
Senior Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	$ 35,709	$ 31,690
Expected life (in years)	11 years	9 years
Prepayment speed assumption (annual CPR) (as a percent)	3.00%	5.00%
Decrease in fair value from:
10% adverse change	$ 347	$ 532
25% adverse change	$ 912	$ 1,335
Discount rate assumption	12.00%	13.00%
Decrease in fair value from:
100 basis point increase	$ 1,646	$ 1,322
200 basis point increase	$ 3,181	$ 2,506
Credit loss assumption	0.03%	0.03%
Subordinate Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	$ 87,647	$ 78,942
Expected life (in years)	10 years	13 years
Prepayment speed assumption (annual CPR) (as a percent)	6.00%	6.00%
Decrease in fair value from:
10% adverse change	$ 626	$ 200
25% adverse change	$ 642	$ 477
Discount rate assumption	9.00%	9.00%
Decrease in fair value from:
100 basis point increase	$ 6,973	$ 6,855
200 basis point increase	$ 12,731	$ 12,883
Credit loss assumption	0.03%	0.03%
Decrease in fair value from:
10% higher losses	$ 646	$ 36
25% higher losses	$ 703	$ 96
Minimum | MSRs
Decrease in fair value from:
Impact of adverse change in prepayment speed	10.00%	10.00%
Impact of increase in discount rate assumption	1.00%	1.00%
Impact of adverse change in expected credit losses	10.00%	10.00%
Minimum | Senior Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	10.00%	10.00%
Impact of increase in discount rate assumption	1.00%	1.00%
Impact of adverse change in expected credit losses	10.00%	10.00%
Minimum | Subordinate Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	10.00%	10.00%
Impact of increase in discount rate assumption	1.00%	1.00%
Impact of adverse change in expected credit losses	10.00%	10.00%
Maximum | MSRs
Decrease in fair value from:
Impact of adverse change in prepayment speed	25.00%	25.00%
Impact of increase in discount rate assumption	2.00%	2.00%
Impact of adverse change in expected credit losses	25.00%	25.00%
Maximum | Senior Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	25.00%	25.00%
Impact of increase in discount rate assumption	2.00%	2.00%
Impact of adverse change in expected credit losses	25.00%	25.00%
Maximum | Subordinate Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	25.00%	25.00%
Impact of increase in discount rate assumption	2.00%	2.00%
Impact of adverse change in expected credit losses	25.00%	25.00%

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Sensitivity Analysis of Fair Value of Interests that Continue to be Held by Transferor, Servicing Assets or Liabilities [Abstract]

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Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Expected Credit Losses [Abstract]

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Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Prepayment Speed [Abstract]

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The hypothetical financial impact of a 200 basis point adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of Adverse Change In Expected Credit Losses, Percent

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Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact On Discount Rate Of Basis Point Increase, Percent

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Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

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The hypothetical financial impact of a 10 percent adverse change of the expected credit losses, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

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The hypothetical financial impact of a specified adverse percentage change in discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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A specified percentage variance in the discount rate assumption in the determination of fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The hypothetical financial impact of a specified adverse percentage change in prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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A specified percentage variance in the prepayment speed assumption in the determination of fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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A specified percentage variance in the expected credit losses assumption, including static pool losses, in the determination of fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities).

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