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Long-Term Debt - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Aug. 31, 2017
Jan. 31, 2016
Nov. 30, 2014
Mar. 31, 2013
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
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    
Federal home loan bank stock           43,393,000 43,393,000 43,393,000    
Accrued interest payable           3,000,000 3,000,000 2,000,000    
Notional amount           6,645,489,000 6,645,489,000 6,644,081,000    
Accrued interest payable [1]           $ 31,076,000 $ 31,076,000 18,435,000    
Trust Preferred Securities And Subordinated Notes                    
Debt Instrument [Line Items]                    
Weighted average interest rates, by series           6.90% 6.90%      
Accrued interest payable           $ 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      
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      
Subordinated Notes                    
Debt Instrument [Line Items]                    
Debt instrument face amount           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      
Debt Instrument interest rate 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                  
Accrued interest payable           3,000,000 $ 3,000,000      
Unamortized debt issuance costs           5,000,000 5,000,000      
Unamortized discount           (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      
Debt Instrument interest rate   4.75%                
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      
Accrued interest payable           $ 1,000,000 $ 1,000,000      
Unamortized debt issuance costs           6,000,000 6,000,000      
Debt instrument maturity year   2023                
Exchangeable Senior Notes Due 2019 | Convertible Debt                    
Debt Instrument [Line Items]                    
Convertible notes       $ 205,000,000   $ 201,000,000 $ 201,000,000      
Debt Instrument interest rate       5.625%            
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      
Accrued interest payable           $ 4,000,000 $ 4,000,000      
Unamortized debt issuance costs           $ 1,000,000 $ 1,000,000      
Debt instrument maturity year       2019            
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      
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    
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      
Additional borrowings from FHLBC           0 0      
Existing debt           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    
Weighted average interest rate           2.24% 2.24% 1.38%    
Weighted average maturity (in years)             7 years 8 years    
FHLB Chicago | Redwood | Held-for-sale residential loans | Residential Real Estate                    
Debt Instrument [Line Items]                    
Loans pledged as collateral under borrowing agreement with FHLBC           $ 2,270,000,000 $ 2,270,000,000      
FHLB Chicago | Redwood | Held-for-sale residential loans | Restricted cash                    
Debt Instrument [Line Items]                    
Loans pledged as collateral under borrowing agreement with FHLBC           $ 25,000,000 $ 25,000,000      
[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 September 30, 2018 and December 31, 2017, assets of consolidated VIEs totaled $3,693,140 and $1,259,774, respectively. At September 30, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $3,417,835 and $1,167,157, respectively. See Note 4 for further discussion.