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Long-Term Debt - Additional Information (Details)
 1 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
Aug. 31, 2017
USD ($)
$ / shares
Nov. 30, 2014
USD ($)
$ / shares
Jul. 31, 2014
Mar. 31, 2013
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
$ / shares
Apr. 30, 2018
USD ($)
Jun. 30, 2017
Debt Instrument [Line Items]                      
FHLB transition period       5 years              
Committed line of credit with financial institutions, outstanding           $ 0 $ 0        
Federal home loan bank stock           43,393,000 43,393,000        
Accrued interest payable           4,000,000 2,000,000        
Convertible notes           201,000,000 250,000,000        
Notional Amount           5,911,385,000 6,644,081,000        
Accrued interest payable (less than) [1]           42,528,000 18,435,000        
Convertible notes | Senior Notes Due 2024                      
Debt Instrument [Line Items]                      
Convertible notes $ 200,000,000         $ 200,000,000          
Debt instrument interest rate 5.625%                    
Percent of par at issuance 99.50%                    
Net proceeds from issuance of convertible debt $ 194,000,000                    
Interest expense yield           6.20%          
Convertible debt, conversion ratio 0.0547645                    
Convertible senior notes conversion per share (in dollars per share) | $ / shares $ 18.26                    
Accrued interest payable           $ 6,000,000          
Unamortized deferred issuance costs           (5,000,000)          
Debt Instrument, Unamortized Discount           1,000,000          
Convertible notes | Senior Notes Due 2023                      
Debt Instrument [Line Items]                      
Convertible notes   $ 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 debt, conversion ratio   0.0539060                  
Convertible senior notes conversion per share (in dollars per share) | $ / shares   $ 18.55                  
Accrued interest payable           4,000,000          
Unamortized deferred issuance costs           (6,000,000)          
Debt instrument, maturity year   2023                  
Convertible notes | Exchangeable senior notes due 2019                      
Debt Instrument [Line Items]                      
Convertible notes     $ 205,000,000     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 debt, conversion ratio     0.0462370                
Convertible senior notes conversion per share (in dollars per share) | $ / shares     $ 21.63                
Accrued interest payable           1,000,000          
Unamortized deferred issuance costs           (1,000,000)          
Debt instrument, maturity year     2019                
Debt instrument, redemption date     Nov. 15, 2019                
Repurchased debt instrument, face amount               $ 4,000,000      
Deferred debt issuance costs           1,000,000          
Convertible notes | Exchangeable senior notes due 2019 | Gain (Loss) on Investments                      
Debt Instrument [Line Items]                      
Gain (loss) on extinguishment of debt               $ 300,000      
Convertible notes | Convertible senior notes due 2018                      
Debt Instrument [Line Items]                      
Convertible notes         $ 288,000,000   288,000,000        
Debt instrument interest rate         4.625%           4.625%
Net proceeds from issuance of convertible debt         $ 279,000,000            
Interest expense yield         4.80%            
Convertible debt, conversion ratio     0.0411320                
Convertible senior notes conversion per share (in dollars per share) | $ / shares                 $ 24.31    
Repurchased debt instrument, face amount             37,000,000        
Gain (loss) on extinguishment of debt             (1,000,000)        
Convertible notes                   $ 250,000,000  
Deferred debt issuance costs             $ 2,000,000        
Trust Preferred Securities                      
Debt Instrument [Line Items]                      
Debt instrument face amount           100,000,000          
Interest expense yield on trust preferred securities and subordinated notes             (6.90%)        
Subordinated Notes                      
Debt Instrument [Line Items]                      
Debt instrument face amount           40,000,000          
Trust Preferred Securities and Subordinated Notes                      
Debt Instrument [Line Items]                      
Accrued interest payable (less than)           1,000,000 $ 1,000,000        
Trust Preferred Securities and Subordinated Notes | Interest rate agreements                      
Debt Instrument [Line Items]                      
Notional Amount           $ 140,000,000          
Trust Preferred Securities and Subordinated Notes | London Interbank Offered Rate (LIBOR)                      
Debt Instrument [Line Items]                      
Basis spread on variable rate           2.25%          
FHLB Chicago | Subsidiaries                      
Debt Instrument [Line Items]                      
Additional borrowings from FHLB           $ 0          
FHLB Chicago | FHLB Subsidiary                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           2,000,000,000          
Committed line of credit with financial institutions, outstanding           2,000,000,000          
Outstanding FHLB advances           $ 2,000,000,000 $ 2,000,000,000        
Weighted average interest rate           2.52% 1.38%        
Weighted average maturity (in years)           7 years 8 years        
FHLB Chicago | Redwood Trust Inc. | Residential Real Estate | Held-for sale residential loans                      
Debt Instrument [Line Items]                      
Residential mortgage loans securing FHLB advances           $ 2,380,000,000          
[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 December 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $6,331,191 and $1,259,774, respectively. At December 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $5,709,807 and $1,167,157, respectively. See Note 4 for further discussion.