Equity - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic Earnings per Common Share:
Net income attributable to Redwood	$ 30,915	$ 97,257
Less: Dividends and undistributed earnings allocated to participating securities	(1,209)	(3,294)
Net income allocated to common shareholders	$ 29,706	$ 93,963
Basic weighted average common shares outstanding (in shares)	119,884,172	112,276,842
Basic Earnings per Common Share (in dollars per share)	$ 0.25	$ 0.84
Diluted Earnings per Common Share:
Net income attributable to Redwood	$ 30,915	$ 97,257
Less: Dividends and undistributed earnings allocated to participating securities	(1,348)	(2,951)
Add back: Interest expense on convertible notes for the period, net of tax	4,582	7,007
Net income allocated to common shareholders	$ 34,149	$ 101,313
Weighted average common shares outstanding (in shares)	119,884,172	112,276,842
Net effect of dilutive equity awards (in shares)	290,831	195,568
Net effect of assumed convertible notes conversion to common shares (in shares)	20,331,154	28,566,875
Diluted weighted average common shares outstanding (in shares)	140,506,157	141,039,285
Diluted Earnings (Loss) per Common Share (in dollars per share)	$ 0.24	$ 0.72