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Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
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