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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Facility
Dec. 31, 2017
USD ($)
Facility
Short-term Debt [Line Items]    
Outstanding Balance [1],[2] $ 1,424,275,000 $ 1,938,682,000
Facilities    
Short-term Debt [Line Items]    
Number of Facilities | Facility 16 13
Outstanding Balance $ 1,424,275,000 $ 1,688,412,000
Facilities | Residential loan warehouse    
Short-term Debt [Line Items]    
Number of Facilities | Facility 4 4
Outstanding Balance $ 578,157,000 $ 1,039,666,000
Limit $ 1,425,000,000 $ 1,575,000,000
Weighted Average Interest Rate 3.83% 3.17%
Weighted Average Days Until Maturity (in days) 177 days 197 days
Facilities | Real estate securities repo    
Short-term Debt [Line Items]    
Number of Facilities | Facility 8 9
Outstanding Balance $ 780,818,000 $ 648,746,000
Limit $ 0 $ 0
Weighted Average Interest Rate 3.29% 2.69%
Weighted Average Days Until Maturity (in days) 27 days 28 days
Facilities | Single-family rental loan warehouse    
Short-term Debt [Line Items]    
Number of Facilities | Facility 2  
Outstanding Balance $ 15,859,000  
Limit $ 400,000,000  
Weighted Average Interest Rate 4.53%  
Weighted Average Days Until Maturity (in days) 661 days  
Facilities | Fix and flip loan warehouse    
Short-term Debt [Line Items]    
Number of Facilities | Facility 2  
Outstanding Balance $ 49,441,000  
Limit $ 60,000,000  
Weighted Average Interest Rate 5.63%  
Weighted Average Days Until Maturity (in days) 205 days  
Convertible notes, net    
Short-term Debt [Line Items]    
Outstanding Balance   $ 250,270,000
Weighted Average Interest Rate   4.63%
Weighted Average Days Until Maturity (in days)   105 days
[1] At December 31, 2017, balance includes $250 million of convertible notes, which matured in April 2018. See Note 12 for further discussion.
[2] 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.