Home Equity Investments (HEI) - Activity of HEI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	$ 5,875	$ 567
Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	(202)	13,207
Home Equity Investments Purchased, Fair Value
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	0	0
Home Equity Investments Purchased, Fair Value | Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	248,218	32,650
Home Equity Investments Transferred, Fair Value
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	0	47,209
Home Equity Investments Transferred, Fair Value | Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	$ 0	$ (47,209)