Principles of Consolidation - Key Assumptions and Sensitivity Analysis for Assets Retained from Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
MSRs
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value		$ 11,092	$ 6,450
Expected life (in years)		6 years	3 years
Prepayment speed assumption (annual CPR) (as a percent)		10.00%	29.00%
Decrease in fair value from:
10% adverse change		$ 1,402	$ 447
25% adverse change		$ 3,405	$ 1,020
Discount rate assumption		11.00%	12.00%
Decrease in fair value from:
100 basis point increase		$ 1,649	$ 152
200 basis point increase		3,180	297
Senior Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value		$ 27,293	$ 18,214
Expected life (in years)		6 years	4 years
Prepayment speed assumption (annual CPR) (as a percent)		11.00%	23.00%
Decrease in fair value from:
10% adverse change		$ 1,002	$ 1,130
25% adverse change		$ 2,406	$ 2,596
Discount rate assumption		12.00%	16.00%
Decrease in fair value from:
100 basis point increase		$ 910	$ 426
200 basis point increase		$ 1,759	$ 829
Credit loss assumption		0.03%	0.35%
Decrease in fair value from:
10% higher losses			$ 0
25% higher losses			0
Subordinate Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value		$ 85,269	$ 127,542
Expected life (in years)		15 years	5 years
Prepayment speed assumption (annual CPR) (as a percent)		10.00%	32.00%
Decrease in fair value from:
10% adverse change		$ 568	$ 531
25% adverse change		$ 1,323	$ 1,440
Discount rate assumption		8.00%	5.00%
Decrease in fair value from:
100 basis point increase		$ 8,522	$ 4,801
200 basis point increase		$ 15,860	$ 9,139
Credit loss assumption		0.03%	0.35%
Decrease in fair value from:
10% higher losses		$ 42	$ 1,528
25% higher losses		$ 103	$ 3,819
Minimum | MSRs
Decrease in fair value from:
Impact of adverse change in prepayment speed	10.00%	10.00%
Impact of increase in discount rate assumption	1.00%	1.00%
Impact of adverse change in expected credit losses	10.00%	10.00%
Minimum | Senior Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	10.00%	10.00%
Impact of increase in discount rate assumption	1.00%	1.00%
Impact of adverse change in expected credit losses	10.00%	10.00%
Minimum | Subordinate Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	10.00%	10.00%
Impact of increase in discount rate assumption	1.00%	1.00%
Impact of adverse change in expected credit losses	10.00%	10.00%
Maximum | MSRs
Decrease in fair value from:
Impact of adverse change in prepayment speed	25.00%	25.00%
Impact of increase in discount rate assumption	2.00%	2.00%
Impact of adverse change in expected credit losses	25.00%	25.00%
Maximum | Senior Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	25.00%	25.00%
Impact of increase in discount rate assumption	2.00%	2.00%
Impact of adverse change in expected credit losses	25.00%	25.00%
Maximum | Subordinate Securities
Decrease in fair value from:
Impact of adverse change in prepayment speed	25.00%	25.00%
Impact of increase in discount rate assumption	2.00%	2.00%
Impact of adverse change in expected credit losses	25.00%	25.00%