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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			9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2019
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	$ 37,904	$ 58,572	$ 37,904
Expected life (in years)	6 years	8 years
Prepayment speed assumption (annual CPR)	14.00%	7.00%
Decrease in fair value from:
10% adverse change	$ 1,893	$ 1,668	1,893
25% adverse change	$ 4,486	$ 4,027	4,486
Discount rate assumption	11.00%	11.00%
Decrease in fair value from:
100 basis point increase	$ 1,259	$ 2,323	1,259
200 basis point increase	2,436	4,493	$ 2,436
Decrease in fair value from:
Impact of adverse change in prepayment speed			25.00%
Impact of increase in discount rate assumption			1.00%
Impact of adverse change in expected credit losses			25.00%
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	$ 41,827	$ 61,178	$ 41,827
Expected life (in years)	5 years	7 years
Prepayment speed assumption (annual CPR)	16.00%	10.00%
Decrease in fair value from:
10% adverse change	$ 1,977	$ 2,151	1,977
25% adverse change	$ 5,189	$ 5,127	5,189
Discount rate assumption	13.00%	12.00%
Decrease in fair value from:
100 basis point increase	$ 848	$ 2,190	848
200 basis point increase	$ 1,977	$ 4,226	1,977
Credit loss assumption	0.21%	0.20%
Decrease in fair value from:
10% higher losses	$ 0	$ 0	0
25% higher losses	0	0	$ 0
Impact of adverse change in prepayment speed			25.00%
Impact of increase in discount rate assumption			1.00%
Impact of adverse change in expected credit losses			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	$ 206,433	$ 230,247	$ 206,433
Expected life (in years)	13 years	15 years
Prepayment speed assumption (annual CPR)	16.00%	9.00%
Decrease in fair value from:
10% adverse change	$ 454	$ 201	454
25% adverse change	$ 1,802	$ 1,372	1,802
Discount rate assumption	5.00%	6.00%
Decrease in fair value from:
100 basis point increase	$ 19,313	$ 21,982	19,313
200 basis point increase	$ 35,950	$ 40,641	35,950
Credit loss assumption	0.21%	0.20%
Decrease in fair value from:
10% higher losses	$ 1,666	$ 1,387	1,666
25% higher losses	$ 4,153	$ 3,471	$ 4,153
Impact of adverse change in prepayment speed			25.00%
Impact of increase in discount rate assumption			1.00%
Impact of adverse change in expected credit losses			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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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 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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