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Activity in Allowance for Losses on Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance [Line Items]      
Balance, beginning of period $ 45,481 $ 64,069  
Recovery of losses on covered loans (15,004) (18,587) $ 30,758
Transfer to the allowance for losses on covered loans [1] (2,416)    
Balance, end of period 31,395 45,481 $ 64,069
Covered      
Valuation Allowance [Line Items]      
Recovery of losses on covered loans $ (11,670) $ (18,588)  
[1] Represents the allowance associated with $14.2 million of loans acquired in the Desert Hills transaction that were transferred from covered loans to non-covered loans upon expiration of the related FDIC loss sharing agreement in March 2015.