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Covered Assets and FDIC Loss Sharing Asset - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended
Oct. 16, 2009
Mar. 31, 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   11,200,000  
Expected cash flows   7,900,000  
Remaining average lives of respective pools loans   4 years 3 months 18 days  
Remaining average lives of respective individual loans   2 years  
FDIC loss sharing asset   1,370,000 4,764,000
Allowance for covered loans   $ 0 $ 0