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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, 2018 | Dec. 31, 2017
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On-balance sheet assets, at fair value: |  |
Maximum loss exposure | $ 355,535 | $ 381,661
Assets transferred: |  |
Principal balance of loans outstanding | 10,277,901 | 8,364,148
Principal balance of loans 30 days delinquent | 30,571 | 27,926
Interest-only, senior and subordinate securities, classified as trading |  |
On-balance sheet assets, at fair value: |  |
Securities | 127,861 | 101,426
Subordinate securities, classified as AFS |  |
On-balance sheet assets, at fair value: |  |
Securities | 164,498 | 219,255
Mortgage servicing rights |  |
On-balance sheet assets, at fair value: |  |
Securities | $ 63,176 | $ 60,980

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