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Long-Term Debt - Additional Information (Details) - USD ($)		1 Months Ended					3 Months Ended			6 Months Ended	12 Months Ended
		Jun. 30, 2018	Aug. 31, 2017	Jan. 31, 2016	Nov. 30, 2014	Mar. 31, 2013	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2016	Jun. 30, 2018	Dec. 31, 2017	Apr. 30, 2018
Debt Instrument [Line Items]
Transition period for subsidiary to be a FHLB-member (in years)				5 years
Existing debt		$ 0					$ 0			$ 0	$ 0
Federal home loan bank stock		43,393,000					43,393,000			43,393,000	43,393,000
Accrued interest payable		3,000,000					3,000,000			3,000,000	2,000,000
Notional amount		7,630,759,000					7,630,759,000			7,630,759,000	6,644,081,000
Accrued interest payable	[1]	$ 21,925,000					$ 21,925,000			$ 21,925,000	18,435,000
Trust Preferred Securities And Subordinated Notes
Debt Instrument [Line Items]
Weighted average interest rates, by series		6.80%					6.80%			6.80%
Accrued interest payable		$ 1,000,000					$ 1,000,000			$ 1,000,000	1,000,000
Trust Preferred Securities And Subordinated Notes | Interest rate swaps
Debt Instrument [Line Items]
Notional amount		140,000,000					140,000,000			$ 140,000,000
Trust Preferred Securities And Subordinated Notes | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate										2.25%
Trust Preferred Securities
Debt Instrument [Line Items]
Debt instrument face amount		100,000,000					100,000,000			$ 100,000,000
Subordinated Notes
Debt Instrument [Line Items]
Debt instrument face amount		40,000,000					40,000,000			40,000,000
Senior Notes Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Convertible notes		$ 200,000,000					$ 200,000,000	$ 200,000,000		$ 200,000,000
Debt Instrument interest rate		5.625%					5.625%	5.625%		5.625%
Debt instrument, percent of par		99.50%
Net proceeds from issuance of convertible debt		$ 194,000,000
Interest expense yield										6.20%
Convertible senior notes conversion rate										0.0547645
Convertible senior notes conversion per share (in dollars per share)		$ 18.26					$ 18.26			$ 18.26
Accrued interest payable		$ 200,000					$ 200,000			$ 200,000
Unamortized debt issuance costs		5,000,000					5,000,000			5,000,000
Unamortized discount		1,000,000					1,000,000			1,000,000
Senior Notes Due 2023 | Convertible Debt
Debt Instrument [Line Items]
Convertible notes		$ 245,000,000	$ 245,000,000				$ 245,000,000			$ 245,000,000
Debt Instrument interest rate			4.75%
Debt instrument maturity year			2023
Net proceeds from issuance of convertible debt			$ 238,000,000
Interest expense yield										5.30%
Convertible senior notes conversion rate										0.0539060
Convertible senior notes conversion per share (in dollars per share)		$ 18.55					$ 18.55			$ 18.55
Accrued interest payable		$ 4,000,000					$ 4,000,000			$ 4,000,000
Unamortized debt issuance costs		6,000,000					6,000,000			6,000,000
Exchangeable Senior Notes Due 2019 | Convertible Debt
Debt Instrument [Line Items]
Convertible notes		$ 201,000,000			$ 205,000,000		$ 201,000,000			$ 201,000,000
Debt Instrument interest rate					5.625%
Debt instrument maturity year					2019
Net proceeds from issuance of convertible debt					$ 198,000,000
Interest expense yield										6.30%
Convertible senior notes conversion rate										0.0462370
Convertible senior notes conversion per share (in dollars per share)		$ 21.63					$ 21.63			$ 21.63
Accrued interest payable		$ 1,000,000					$ 1,000,000			$ 1,000,000
Unamortized debt issuance costs		$ 2,000,000					$ 2,000,000			$ 2,000,000
Debt instrument redemption date										Nov. 15, 2019
Amount of debt repurchased									$ 4,000,000
Exchangeable Senior Notes Due 2019 | Convertible Debt | Gain (loss) on investments
Debt Instrument [Line Items]
Gain on extinguishment of debt									$ 300,000
Convertible Senior Notes Due 2018 | Convertible Debt
Debt Instrument [Line Items]
Convertible notes						$ 288,000,000		$ 288,000,000
Debt Instrument interest rate								4.625%
Net proceeds from issuance of convertible debt						$ 279,000,000
Interest expense yield										4.80%
Convertible senior notes conversion rate										0.0411320
Convertible senior notes conversion per share (in dollars per share)		$ 24.31					$ 24.31			$ 24.31
Amount of debt repurchased								$ 37,000,000				$ 250,000,000
Gain on extinguishment of debt								(1,000,000)
Unamortized deferred issuance costs								$ 2,000,000
Repurchase Agreement, Single Family Residential Loans, Facility 1 | Facilities
Debt Instrument [Line Items]
Maximum borrowing limit		$ 200,000,000					$ 200,000,000			$ 200,000,000
Existing debt		0					0			0
Repurchase Agreement, Single Family Residential Loans, Facility 2 | Facilities
Debt Instrument [Line Items]
Maximum borrowing limit		200,000,000					200,000,000			200,000,000
Existing debt		0					0			$ 0
FHLB Chicago
Debt Instrument [Line Items]
Federal home loan bank advances, reset period of basis margin (in days)										91 days
FHLB Chicago | FHLB Member Subsidiary
Debt Instrument [Line Items]
Maximum borrowing limit		2,000,000,000					2,000,000,000			$ 2,000,000,000
Additional borrowings from FHLBC							0			0
Existing debt		2,000,000,000					2,000,000,000			2,000,000,000
Federal home loan bank advances outstanding		$ 2,000,000,000					$ 2,000,000,000			$ 2,000,000,000	$ 2,000,000,000
Weighted average interest rate		2.03%					2.03%			2.03%	1.38%
Weighted average maturity (in years)										7 years	8 years
FHLB Chicago | Redwood | Held-for-sale residential loans
Debt Instrument [Line Items]
Loans pledged as collateral under borrowing agreement with FHLBC		$ 2,310,000,000					$ 2,310,000,000			$ 2,310,000,000
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At June 30, 2018 and December 31, 2017, assets of consolidated VIEs totaled $2,082,771 and $1,259,774, respectively. At June 30, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $1,935,299 and $1,167,157, respectively. See Note 4 for further discussion.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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-Topic 210
-SubTopic 10
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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

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X

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 14
-Subparagraph (b)
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- Definition

Amount of cash inflow from collection of advance by Federal Home Loan Bank (FHLBank), classified as investing activity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Paragraph 12
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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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