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Principles of Consolidation - Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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On-balance sheet assets, at fair value: |  |
Maximum loss exposure | $ 269,328 | $ 349,997
Principal balance of loans outstanding | 10,299,442 | 10,580,216
Principal balance of loans 30 days delinquent | 41,809 | 21,805
Interest-only, senior and subordinate securities, classified as trading |  |
On-balance sheet assets, at fair value: |  |
Securities | 88,425 | 129,111
Subordinate securities, classified as AFS |  |
On-balance sheet assets, at fair value: |  |
Securities | 140,649 | 162,314
Mortgage servicing rights |  |
On-balance sheet assets, at fair value: |  |
Securities | $ 40,254 | $ 58,572

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