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Activity in Allowance for Losses on Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Valuation Allowance [Line Items]        
Balance, beginning of period     $ 31,395 $ 45,481
Provision for (recovery of) losses $ (55) $ (9,028) 664 (8,687)
Transfer to the allowance for losses on non-covered loans [1]       (2,416)
Balance, end of period $ 25,360 $ 37,632 25,360 37,632
Covered        
Valuation Allowance [Line Items]        
Provision for (recovery of) losses     $ (6,035) $ (5,433)
[1] Represents the allowance associated with $14.2 million of loans acquired in the Desert Hills Bank transaction that were transferred from covered loans to non-covered loans upon expiration of the related FDIC loss sharing agreement.