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Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Oct. 16, 2009 | Jun. 30, 2016 | Dec. 31, 2015
Business Combinations [Abstract] |  |  |
Acquisition date |  | Oct. 16, 2009 |
After-tax gain included in earnings due to purchase method | $ 12,300,000 |  |
Remaining discount associated with SJB loans |  | $ 2,400,000 |
Expected cash flows |  | $ 1,000,000 |
Remaining average lives of respective pools loans |  | 3 years |
Allowance for PCI loans losses |  | $ 310,000 | $ 0

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