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Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
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Oct. 16, 2009 | Dec. 31, 2016
Business Combinations [Abstract] |  |
Acquisition date |  | Oct. 16, 2009
After-tax gain included in earnings due to purchase method | $ 12.3 |
Remaining discount associated with SJB loans |  | $ 1.5
Expected cash flows |  | $ 1.0
Remaining average lives of respective pools loans |  | 2 years 6 months
Claims submitted for net losses on PCI loans |  | $ 119.1

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