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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, 2018	Dec. 31, 2017
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	$ 63,915	$ 60,980
Expected life (in years)	8 years	8 years
Prepayment speed assumption (annual CPR)	7.00%	9.00%
Decrease in fair value from:
10% adverse change	$ 1,816	$ 2,022
25% adverse change	$ 4,388	$ 4,839
Discount rate assumption	11.00%	11.00%
Decrease in fair value from:
100 basis point increase	$ 2,596	$ 2,386
200 basis point increase	$ 5,009	4,597
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 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	$ 49,299	$ 33,773
Expected life (in years)	7 years	6 years
Prepayment speed assumption (annual CPR)	9.00%	10.00%
Decrease in fair value from:
10% adverse change	$ 1,671	$ 1,371
25% adverse change	$ 4,087	$ 3,289
Discount rate assumption	11.00%	11.00%
Decrease in fair value from:
100 basis point increase	$ 1,772	$ 1,158
200 basis point increase	$ 3,486	$ 2,265
Credit loss assumption	0.20%	0.25%
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	$ 247,584	$ 286,908
Expected life (in years)	14 years	13 years
Prepayment speed assumption (annual CPR)	10.00%	11.00%
Decrease in fair value from:
10% adverse change	$ 643	$ 611
25% adverse change	$ 1,587	$ 1,506
Discount rate assumption	5.00%	5.00%
Decrease in fair value from:
100 basis point increase	$ 22,876	$ 25,827
200 basis point increase	$ 42,351	$ 47,885
Credit loss assumption	0.20%	0.25%
Decrease in fair value from:
10% higher losses	$ 1,285	$ 1,551
25% higher losses	$ 3,213	$ 3,873
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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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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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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