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Principles of Consolidation - Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Debt securities, available for sale | $ 218,458 | $ 239,334
Variable Interest Entity, Not Primary Beneficiary |  |
Assets |  |
Maximum loss exposure | 165,870 | 269,328
Assets transferred: |  |
Principal balance of loans outstanding | 7,728,432 | 10,299,442
Principal balance of loans 30+ days delinquent | 138,029 | 41,809
Interest-only, senior and subordinate securities, classified as trading | Variable Interest Entity, Not Primary Beneficiary |  |
Assets |  |
Debt securities, trading | 20,982 | 88,425
Subordinate securities, classified as AFS | Variable Interest Entity, Not Primary Beneficiary |  |
Assets |  |
Debt securities, available for sale | 136,475 | 140,649
Mortgage servicing rights |  |
Assets |  |
Servicing asset, fair value | 8,815 | 42,224
Mortgage servicing rights | Variable Interest Entity, Not Primary Beneficiary |  |
Assets |  |
Servicing asset, fair value | $ 8,413 | $ 40,254

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