Home Equity Investments (HEI) - Geographic Concentration of HEI (Details) - Geographic Concentration Risk - Investments Benchmark	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
HEI at Redwood
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	100.00%	100.00%
HEI at Redwood | California
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	44.00%	42.00%
HEI at Redwood | Florida
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	14.00%	9.00%
HEI at Redwood | Arizona
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	7.00%	10.00%
HEI at Redwood | Washington
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	6.00%	12.00%
HEI at Redwood | Colorado
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	5.00%	3.00%
HEI at Redwood | New York
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	4.00%	5.00%
HEI at Redwood | Other states (none greater than 5%)
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	20.00%	19.00%
Securitized HEI
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	100.00%	100.00%
Securitized HEI | California
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	59.00%	58.00%
Securitized HEI | Florida
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	4.00%	4.00%
Securitized HEI | Arizona
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	0.00%	0.00%
Securitized HEI | Washington
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	6.00%	6.00%
Securitized HEI | Colorado
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	4.00%	5.00%
Securitized HEI | New York
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	11.00%	10.00%
Securitized HEI | Other states (none greater than 5%)
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage	16.00%	17.00%