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Long-Term Debt - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2017
Jan. 31, 2016
Nov. 30, 2014
Mar. 31, 2013
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2016
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  
Federal home loan bank stock         43,393,000     43,393,000  
Accrued interest payable         2,000,000     2,000,000  
Notional amount         7,639,175,000     6,644,081,000  
Accrued interest payable [1]         $ 23,492,000     18,435,000  
Trust Preferred Securities And Subordinated Notes                  
Debt Instrument [Line Items]                  
Weighted average interest rates, by series         6.80%        
Accrued interest payable         $ 1,000,000     1,000,000  
Trust Preferred Securities And Subordinated Notes | Interest rate swaps                  
Debt Instrument [Line Items]                  
Notional amount         $ 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        
Subordinated Notes                  
Debt Instrument [Line Items]                  
Debt instrument face amount         40,000,000        
Senior Notes Due 2023 | Convertible Debt                  
Debt Instrument [Line Items]                  
Convertible notes $ 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         0.0538394        
Convertible senior notes conversion per share (in dollars per share)         $ 18.57        
Accrued interest payable         $ 1,000,000        
Unamortized debt issuance costs         7,000,000        
Exchangeable Senior Notes Due 2019 | Convertible Debt                  
Debt Instrument [Line Items]                  
Convertible notes     $ 205,000,000   $ 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         0.0461798        
Convertible senior notes conversion per share (in dollars per share)         $ 21.65        
Accrued interest payable         $ 4,000,000        
Unamortized debt issuance costs         $ 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        
Accrued interest payable         $ 5,000,000        
Unamortized debt issuance costs         100,000        
Amount of debt repurchased           37,000,000      
Gain on extinguishment of debt           (1,000,000)      
Unamortized deferred issuance costs           $ 2,000,000      
Current maturities of long-term debt         $ 250,000,000        
Convertible Senior Notes Due 2018 | Convertible Debt | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt Instrument interest rate                 4.625%
Amount of debt repurchased                 $ 250,000,000
FHLB Chicago                  
Debt Instrument [Line Items]                  
Federal home loan bank advances, reset period of basis margin (in days)         91 days        
FHLB Chicago | Redwood | Held-for-sale residential loans                  
Debt Instrument [Line Items]                  
Loans pledged as collateral under borrowing agreement with FHLBC         $ 2,370,000,000        
FHLB Member Subsidiary | FHLB Chicago                  
Debt Instrument [Line Items]                  
Maximum borrowing limit         2,000,000,000        
Additional borrowings from FHLBC         0        
Existing debt         2,000,000,000        
Federal home loan bank advances outstanding         $ 2,000,000,000     $ 2,000,000,000  
Weighted average interest rate         1.74%     1.38%  
Weighted average maturity (in years)         7 years     8 years  
[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 March 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $1,647,850 and $1,259,774, respectively. At March 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $1,546,066 and $1,167,157, respectively. See Note 4 for further discussion.