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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
	Dec. 31, 2018	Mar. 31, 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	$ 58,572	$ 53,657
Expected life (in years)	8 years	8 years
Prepayment speed assumption (annual CPR)	7.00%	8.00%
Decrease in fair value from:
10% adverse change	$ 1,668	$ 1,749
25% adverse change	$ 4,027	$ 4,199
Discount rate assumption	11.00%	11.00%
Decrease in fair value from:
100 basis point increase	$ 2,323	$ 2,092
200 basis point increase	4,493	$ 4,036
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	$ 61,178	$ 57,536
Expected life (in years)	7 years	7 years
Prepayment speed assumption (annual CPR)	10.00%	10.00%
Decrease in fair value from:
10% adverse change	$ 2,151	$ 1,951
25% adverse change	$ 5,127	$ 4,924
Discount rate assumption	12.00%	12.00%
Decrease in fair value from:
100 basis point increase	$ 2,190	$ 1,783
200 basis point increase	$ 4,226	$ 3,629
Credit loss assumption	0.20%	0.20%
Decrease in fair value from:
10% higher losses	$ 0	$ 0
25% higher losses	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	$ 230,247	$ 221,367
Expected life (in years)	15 years	15 years
Prepayment speed assumption (annual CPR)	9.00%	8.00%
Decrease in fair value from:
10% adverse change	$ 201	$ 92
25% adverse change	$ 1,372	$ 927
Discount rate assumption	6.00%	5.00%
Decrease in fair value from:
100 basis point increase	$ 21,982	$ 22,094
200 basis point increase	$ 40,641	$ 40,797
Credit loss assumption	0.20%	0.20%
Decrease in fair value from:
10% higher losses	$ 1,387	$ 1,504
25% higher losses	$ 3,471	$ 3,754
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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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 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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