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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 | Jun. 30, 2015 | Dec. 31, 2014
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On-balance sheet assets, at fair value: |  |
Maximum loss exposure | $ 432,298 | $ 611,593
Principal balance of loans outstanding | 7,570,297 | 7,276,825
Principal balance of delinquent loans 30+ days delinquent | 17,646 | 17,022
Interest-only, senior and subordinate securities, classified as trading |  |
On-balance sheet assets, at fair value: |  |
Securities | 72,505 | 93,802
Senior and subordinate securities, classified as AFS |  |
On-balance sheet assets, at fair value: |  |
Securities | 294,040 | 460,990
Mortgage servicing rights |  |
On-balance sheet assets, at fair value: |  |
Securities | $ 65,753 | $ 56,801

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