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Equity Compensation Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2020
May 31, 2020
Dec. 31, 2018
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 40,188 $ 42,383    
Weighted average amortization period remaining for equity awards (in years)       2 years      
Long-term incentive award expense       $ 23,101 $ 19,938 $ 12,439  
Performance-based valuation adjustment       $ 3,205      
Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for grant under Redwood's Incentive Plan (in shares)       2,896,604 5,958,390    
Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 0 $ 0    
Share of common stock authorized (in shares)       850,000      
Performance-based valuation adjustment       $ 0      
Share purchased (in shares)       657,777      
Executive Deferred Compensation Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for grant under Redwood's Incentive Plan (in shares)       151,005      
Number of additional shares authorized (in shares)       200,000      
Restricted Stock Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Long-term incentive award expense       $ 100 $ 500 $ 1,000  
Number of stock awards granted (in shares)       0 0 0  
Number of stock awards forfeited (in shares)       341 0 34,857  
Granted (in dollars per share)       $ 0 $ 0 $ 0  
Number of stock awards vested (in shares)       27,800 50,857 102,615  
Restricted Stock Awards | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 0 $ 84    
Performance-based valuation adjustment       0      
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 5,000      
Weighted average amortization period remaining for equity awards (in years)       1 year      
Long-term incentive award expense       $ 3,000 $ 2,000 $ 1,000  
Number of stock awards granted (in shares)       558,388 272,261 205,482  
Number of stock awards forfeited (in shares)       48,915 45,343 130,155  
Granted (in dollars per share)       $ 8.38 $ 8.80 $ 16.86  
Number of stock awards vested (in shares)       134,426 78,270 68,076  
Restricted Stock Units | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 5,068 $ 3,589    
Performance-based valuation adjustment       0      
Deferred Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       20,000      
Long-term incentive award expense       $ 13,000 $ 9,000 $ 8,000  
Unvested outstanding stock awards (in units)       2,335,551 2,552,186    
Weighted-average grant date fair value of stock awards (in dollars per unit)       $ 10.74 $ 12.07    
Number of stock awards granted (in shares)       1,759,344 1,588,862 1,186,154  
Number of stock awards forfeited (in shares)       398,693 31,161 291,253  
Share-based compensation, vesting period (in years)       4 years      
Granted (in dollars per share)       $ 8.83 $ 12.04 $ 10.69  
Deferred Stock Units | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 19,849 $ 26,473    
Performance-based valuation adjustment       0      
Performance Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 15,000      
Long-term incentive award expense         $ 3,000 $ 100  
Unvested outstanding stock awards (in units)       2,354,002 1,473,883    
Weighted-average grant date fair value of stock awards (in dollars per unit) $ 10.42       $ 15.68 $ 10.42  
Number of stock awards granted (in shares)       1,086,153 518,173 473,845  
Number of stock awards forfeited (in shares)       0 0 99,175 275,831
Share-based compensation, vesting period (in years)       3 years      
BvTSR for tranche (as a percent)       25.00% 7.70%    
Adjustment to stock-based compensation       $ 1,000      
Performance Stock Units | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       15,271 $ 12,237    
Performance-based valuation adjustment       $ 3,205      
Performance Stock Units | Performance Share Units (PSUs), 2022              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average grant date fair value of stock awards (in dollars per unit)       $ 9.09      
Vesting percentage if TSR is 25%       100.00%      
Stock price valuation period       60 days      
Grant date fair value assumptions, volatility rate       69.00%      
Grant date fair value assumptions, risk-free rate       3.91%      
Grant date fair value assumptions, dividend yield       0.00%      
TSR performance period (in years)       3 years      
Performance Stock Units | Performance Share Units (PSUs), 2021              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value (in dollars per share)       $ 15.68      
Grant date fair value assumptions, volatility rate       59.00%      
Grant date fair value assumptions, risk-free rate       0.98%      
Grant date fair value assumptions, dividend yield       0.00%      
TSR performance period (in years)       3 years      
Performance Stock Units | Performance Share Units (PSUs), 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value (in dollars per share)         $ 10.42    
Grant date fair value assumptions, volatility rate         54.00%    
Grant date fair value assumptions, risk-free rate         0.18%    
Grant date fair value assumptions, dividend yield         0.00%    
TSR performance period (in years)       3 years      
Performance Stock Units | Performance Share Units (PSUs), 2019              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value (in dollars per share)         $ 17.13    
Stock price valuation period           60 days  
Grant date fair value assumptions, volatility rate         15.00%    
Grant date fair value assumptions, risk-free rate         1.68%    
Grant date fair value assumptions, dividend yield         0.00%    
TSR performance period (in years)       3 years 3 years    
Performance Stock Units | Performance Share Units (PSUs), 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of stock awards granted (in shares)       518,173   473,845  
BvTSR for tranche (as a percent)       25.00%      
Relative increase/decrease in vesting percentage based on TSR       50.00%      
Vesting percentage cap if first 2 steps yield a vesting level greater than 100%     100.00%        
Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, vesting period (in years)   3 years          
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2022              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       0.00%      
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 0.00%            
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 0.00%            
First baseline vesting percentage     0.00%        
Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, vesting period (in years)   4 years          
Maximum | Deferred Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average amortization period remaining for equity awards (in years)       2 years      
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2022              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       250.00%      
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 200.00%            
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 250.00%            
First baseline vesting percentage     200.00%