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Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Business Combinations [Abstract] |
Acquisition date | Oct. 16, 2009
Remaining discount associated with SJB loans | $ 2.0
Claims submitted for net losses on PCI loans | $ 118.9

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