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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 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
On-balance sheet assets, at fair value: |  |
Maximum loss exposure | $ 347,710 | $ 334,734
Assets transferred: |  |
Principal balance of loans outstanding | 7,760,334 | 6,870,398
Principal balance of loans 30 days delinquent | 18,144 | 21,427
Interest-only, senior and subordinate securities, classified as trading |  |
On-balance sheet assets, at fair value: |  |
Securities | 69,825 | 41,909
Subordinate securities, classified as AFS |  |
On-balance sheet assets, at fair value: |  |
Securities | 216,269 | 234,025
Mortgage servicing rights |  |
On-balance sheet assets, at fair value: |  |
Securities | $ 61,616 | $ 58,800

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