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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	Dec. 31, 2021	Dec. 31, 2020
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	$ 6,450	$ 8,413
Expected life (in years)	3 years	2 years
Prepayment speed assumption (annual CPR) (as a percent)	29.00%	37.00%
Decrease in fair value from:
10% adverse change	$ 447	$ 906
25% adverse change	$ 1,020	$ 2,058
Discount rate assumption (as a percent)	12.00%	12.00%
Decrease in fair value from:
100 basis point increase	$ 152	$ 196
200 basis point increase	$ 297	$ 380
MSRs | Minimum
Decrease in fair value from:
Impact of adverse change in prepayment speed (as a percent)	10.00%	10.00%
Decrease in fair value from:
Impact of increase in discount rate assumption	1.00%	1.00%
Decrease in fair value from:
Impact of adverse change in expected credit losses (as a percent)	10.00%	10.00%
MSRs | Maximum
Decrease in fair value from:
Impact of adverse change in prepayment speed (as a percent)	25.00%	25.00%
Decrease in fair value from:
Impact of increase in discount rate assumption	2.00%	2.00%
Decrease in fair value from:
Impact of adverse change in expected credit losses (as a percent)	25.00%	25.00%
Senior IO 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	$ 18,214	$ 17,333
Expected life (in years)	4 years	3 years
Prepayment speed assumption (annual CPR) (as a percent)	23.00%	31.00%
Decrease in fair value from:
10% adverse change	$ 1,130	$ 1,557
25% adverse change	$ 2,596	$ 3,754
Discount rate assumption (as a percent)	16.00%	21.00%
Decrease in fair value from:
100 basis point increase	$ 426	$ 337
200 basis point increase	$ 829	$ 659
Credit loss assumption (as a percent)	0.35%	0.41%
Decrease in fair value from:
10% higher losses	$ 0	$ 0
25% higher losses	$ 0	$ 0
Senior IO Securities | Minimum
Decrease in fair value from:
Impact of adverse change in prepayment speed (as a percent)	10.00%	10.00%
Decrease in fair value from:
Impact of increase in discount rate assumption	1.00%	1.00%
Decrease in fair value from:
Impact of adverse change in expected credit losses (as a percent)	10.00%	10.00%
Senior IO Securities | Maximum
Decrease in fair value from:
Impact of adverse change in prepayment speed (as a percent)	25.00%	25.00%
Decrease in fair value from:
Impact of increase in discount rate assumption	2.00%	2.00%
Decrease in fair value from:
Impact of adverse change in expected credit losses (as a percent)	25.00%	25.00%
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	$ 127,542	$ 140,124
Expected life (in years)	5 years	8 years
Prepayment speed assumption (annual CPR) (as a percent)	32.00%	33.00%
Decrease in fair value from:
10% adverse change	$ 531	$ 452
25% adverse change	$ 1,440	$ 2,298
Discount rate assumption (as a percent)	5.00%	5.00%
Decrease in fair value from:
100 basis point increase	$ 4,801	$ 9,769
200 basis point increase	$ 9,139	$ 18,650
Credit loss assumption (as a percent)	0.35%	0.41%
Decrease in fair value from:
10% higher losses	$ 1,528	$ 2,409
25% higher losses	$ 3,819	$ 5,915
Subordinate Securities | Minimum
Decrease in fair value from:
Impact of adverse change in prepayment speed (as a percent)	10.00%	10.00%
Decrease in fair value from:
Impact of increase in discount rate assumption	1.00%	1.00%
Decrease in fair value from:
Impact of adverse change in expected credit losses (as a percent)	10.00%	10.00%
Subordinate Securities | Maximum
Decrease in fair value from:
Impact of adverse change in prepayment speed (as a percent)	25.00%	25.00%
Decrease in fair value from:
Impact of increase in discount rate assumption	2.00%	2.00%
Decrease in fair value from:
Impact of adverse change in expected credit losses (as a percent)	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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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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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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-Publisher FASB
-Name Accounting Standards Codification
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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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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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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.

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