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Activity in Allowance for Losses on Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Valuation Allowance [Line Items]    
Balance, beginning of period $ 31,395 $ 45,481
Provision for (recovery of) losses (176) 7
Transfer to the allowance for losses on non-covered loans [1]   (2,416)
Balance, end of period 28,498 43,942
Covered    
Valuation Allowance [Line Items]    
Provision for (recovery of) losses $ (2,897) $ 877
[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.