Home Equity Investments (HEI) - Activity of HEI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]
Net market valuation gains	$ 1,068	$ 5,731
Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains	3,840	1,192
Home Equity Investments Purchased, Fair Value
Schedule of Equity Method Investments [Line Items]
Net market valuation gains	0	0
Home Equity Investments Purchased, Fair Value | Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains	$ 16,559	$ 40,141