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Principles of Consolidation - Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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On-balance sheet assets, at fair value: |  |
Maximum loss exposure | $ 346,034 | $ 588,396
Principal balance of loans outstanding | 7,055,574 | 7,318,167
Principal balance of delinquent loans 30+ days delinquent | 15,235 | 18,300
Interest-only, senior and subordinate securities, classified as trading |  |
On-balance sheet assets, at fair value: |  |
Securities | 32,434 | 258,697
Senior and subordinate securities, classified as AFS |  |
On-balance sheet assets, at fair value: |  |
Securities | 274,380 | 272,715
Mortgage servicing rights |  |
On-balance sheet assets, at fair value: |  |
Securities | $ 39,220 | $ 56,984

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