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Covered Assets and FDIC Loss Sharing Asset - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended
Oct. 16, 2009
Sep. 30, 2014
Dec. 31, 2013
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   8,200,000  
Expected cash flows   5,700,000  
Remaining average lives of respective pools loans   4 years 2 months 12 days  
Remaining average lives of respective individual loans   6 months  
FDIC loss sharing asset   331,000 4,764,000
Remaining contract life expiration date   Oct. 31, 2014  
Allowance for covered loans   $ 0 $ 0