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Principles of Consolidation - Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
On-balance sheet assets, at fair value:    
Subordinate securities, classified as AFS $ 142,279 $ 206,792
Total Subordinate Investment Securities    
On-balance sheet assets, at fair value:    
Subordinate securities, classified as AFS 142,279 206,792
Variable Interest Entity, Not Primary Beneficiary    
On-balance sheet assets, at fair value:    
Maximum loss exposure 118,491 152,206
Assets transferred:    
Principal balance of loans outstanding 4,146,817 4,959,234
Principal balance of loans 30+ days delinquent 21,803 30,594
Variable Interest Entity, Not Primary Beneficiary | Total Subordinate Investment Securities    
On-balance sheet assets, at fair value:    
Subordinate securities, classified as AFS 78,065 127,542
Interest-only, senior and subordinate securities, classified as trading | Variable Interest Entity, Not Primary Beneficiary    
On-balance sheet assets, at fair value:    
Interest-only, senior and subordinate securities, classified as trading 28,511 18,214
Mortgage servicing rights    
On-balance sheet assets, at fair value:    
Mortgage servicing rights 24,796 12,438
Mortgage servicing rights | Variable Interest Entity, Not Primary Beneficiary    
On-balance sheet assets, at fair value:    
Mortgage servicing rights $ 11,915 $ 6,450