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Equity Compensation Plans - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 40,454,000 $ 37,605,000    
Weighted average amortization period remaining for equity awards (in years)       2 years      
Long-term incentive award expense       $ 25,025,000 $ 24,854,000 $ 23,101,000  
Performance-based valuation adjustment       $ 1,626,000      
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)       7,027,251 10,211,459    
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)       82,395      
Number of additional shares authorized (in shares)         100,000    
Restricted Stock Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards outstanding (in shares)       0      
Long-term incentive award expense       $ 0 $ 0 100,000  
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 7,000,000      
Weighted average amortization period remaining for equity awards (in years)       2 years      
Long-term incentive award expense       $ 2,000,000 $ 3,000,000 $ 3,000,000  
Share-based compensation, vesting period (in years)       4 years      
Granted (in shares)       1,027,640 275,005 558,388  
Restricted Stock Units | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 6,984,000 $ 3,166,000    
Performance-based valuation adjustment       0      
Deferred Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       18,000,000      
Long-term incentive award expense       $ 11,000,000 $ 11,000,000 $ 13,000,000  
Share-based compensation, vesting period (in years)       4 years      
Unvested outstanding stock awards (in units)       3,011,071 2,536,692    
Weighted-average grant date fair value of stock awards (in dollars per unit)       $ 7.71 $ 9.05    
Granted (in shares)       1,698,285 1,499,621 1,759,344  
Deferred Stock Units | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 17,630,000 $ 18,920,000    
Performance-based valuation adjustment       0      
Performance Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       16,000,000      
Long-term incentive award expense       $ 6,000,000 $ 4,000,000 $ 4,000,000  
Share-based compensation, vesting period (in years)       3 years      
Granted (in shares) 473,845   564,975 1,058,644 993,868 1,086,153 518,173
Performance Stock Units | Forecast              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)   180,000          
Performance Stock Units | Tranche One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, vesting period (in years)       3 years      
BvTSR for tranche (as a percent)       25.00%      
Performance Stock Units | Tranche Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, vesting period (in years)       3 years      
Performance Stock Units | Tranche Three              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, vesting period (in years)       3 years      
Performance Stock Units | Tranche Three | Cash-Settled Performance Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity awards, vesting percentage       100.00%      
Performance Stock Units | Redwood Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 15,840,000 $ 15,519,000    
Performance-based valuation adjustment       $ 1,626,000      
Performance Stock Units | Performance Share Units (PSUs), 2023 | Tranche One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage if TSR is 25%       100.00%      
Equity awards, vesting percentage       66.66%      
Performance Stock Units | Performance Share Units (PSUs), 2023 | Tranche Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage if TSR is 25%       100.00%      
Equity awards, vesting percentage       33.33%      
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), 2023 | Tranche One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       0.00%      
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2023 | Tranche Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
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), 2023 | Tranche One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       250.00%      
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2023 | Tranche Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       250.00%