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Activity in Allowance for Losses on Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance [Line Items]      
Balance, beginning of period $ 31,395 $ 45,481 $ 64,069
Provision for (recovery of) losses 4,180 (15,004) (18,587)
Transfer to the allowance for losses on covered loans [1]   (2,416)  
Balance, end of period 23,701 31,395 45,481
Covered      
Valuation Allowance [Line Items]      
Provision for (recovery of) losses $ (7,694) $ (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.