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Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) - USD ($)
 9 Months Ended
Oct. 16, 2009
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Business Acquisition [Line Items]        
Acquisition date   Oct. 16, 2009    
After-tax gain included in earnings due to purchase method $ 12,300,000      
Remaining discount associated with SJB loans   $ 1,900,000    
Expected cash flows   $ 1,200,000    
Remaining average lives of respective pools loans   3 years    
Allowance for PCI loans losses   $ 600,000   $ 0
PCI Loans [Member]        
Business Acquisition [Line Items]        
Allowance for PCI loans losses   $ 600,000 $ 0 $ 0