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Long-Term Debt - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2016
Nov. 30, 2014
Mar. 31, 2013
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
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       5,000,000 5,000,000   3,000,000
Notional amount       5,240,950,000 5,240,950,000   4,980,343,000
Accrued interest payable [1]       $ 9,939,000 $ 9,939,000   9,608,000
Trust Preferred Securities And Subordinated Notes              
Debt Instrument [Line Items]              
Weighted average interest rates, by series (as a percent)       6.80% 6.80%    
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 (as a percent)         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    
Exchangeable Senior Notes | Convertible Debt              
Debt Instrument [Line Items]              
Convertible notes   $ 205,000,000   $ 201,000,000 $ 201,000,000    
Debt Instrument interest rate (as a percent)   5.625%          
Debt instrument maturity year   2019          
Debt instrument redemption date   Nov. 15, 2019          
Net proceeds from issuance of convertible debt   $ 198,000,000          
Interest expense yield (as a percent)         6.40%    
Convertible senior notes conversion rate         0.0461798    
Convertible senior notes conversion per share (in dollars per share)       $ 21.65 $ 21.65    
Amount of debt repurchased       $ 0 $ 0 $ 4,000,000  
Accrued interest payable       1,000,000 1,000,000    
Unamortized debt issuance costs       3,000,000 3,000,000    
Exchangeable Senior Notes | 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 (as a percent)       4.625% 4.625%    
Net proceeds from issuance of convertible debt     $ 279,000,000        
Interest expense yield (as a percent)         5.20%    
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 $ 37,000,000    
Gain on extinguishment of debt       (1,000,000)      
Long-term Debt, Current Maturities       250,000,000 250,000,000    
Accrued interest payable       2,000,000 2,000,000    
Unamortized debt issuance costs       400,000 400,000    
Unamortized deferred issuance costs       2,000,000 $ 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 | Held-for-sale residential loans              
Debt Instrument [Line Items]              
Loans pledged as collateral under borrowing agreement with FHLBC       2,350,000,000 $ 2,350,000,000    
FHLB Member Subsidiary | FHLB Chicago              
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 (as a percent)       1.10% 1.10%   0.64%
Weighted average maturity (in years)         8 years   9 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 June 30, 2017 and December 31, 2016, assets of consolidated VIEs totaled $713,404 and $798,317, respectively. At June 30, 2017 and December 31, 2016, liabilities of consolidated VIEs totaled $693,137 and $773,980, respectively. See Note 4 for further discussion.