Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	$ 40,188
Equity grants	8,354
Equity grant forfeitures	(174)
Equity compensation expense	(6,190)
Unrecognized Compensation Cost at End of Period	42,178
Redwood Incentive Plan | Restricted Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	5,068
Equity grants	1,982
Equity grant forfeitures	(174)
Equity compensation expense	(1,420)
Unrecognized Compensation Cost at End of Period	5,456
Redwood Incentive Plan | Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	19,849
Equity grants	5,950
Equity grant forfeitures	0
Equity compensation expense	(2,930)
Unrecognized Compensation Cost at End of Period	22,869
Redwood Incentive Plan | Performance Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	15,271
Equity grants	0
Equity grant forfeitures	0
Equity compensation expense	(1,734)
Unrecognized Compensation Cost at End of Period	13,537
Employee Stock Purchase Plan
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	0
Equity grants	422
Equity grant forfeitures	0
Equity compensation expense	(106)
Unrecognized Compensation Cost at End of Period	$ 316