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Covered Assets and FDIC Loss Sharing Asset - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Oct. 16, 2009
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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   12,800,000    
Expected cash flows   8,800,000    
Remaining average lives of respective pools loans   4 years 4 months 24 days    
Remaining average lives of respective individual loans   1 year 3 months 18 days    
FDIC loss sharing asset   4,764,000 18,489,000 59,453,000
Allowance for covered loans   0 0  
Claims submitted for net losses on covered loans   $ 122,800,000