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Aggregate Activity in Allowance For Loan Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 20,227 $ 24,077 $ 25,770
Removal of loans transferred   (682)  
Provision for loan losses     8,659
Provision for (recovery of) loan losses 2,162 (277)  
Benefit attributable to the FDIC indemnification asset 29 422 (451)
(Recovery of) provision for loan losses charged to operations 2,191 145 8,208
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset (29) (422) 451
Charge-offs (3,745) (6,481) (12,527)
Recoveries 1,589 3,590 2,175
Net charge-offs (2,156) (2,891) (10,352)
Ending balance 20,233 20,227 24,077
Allowance Excluding Purchased Credit Impaired      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 20,169 23,322 25,762
Removal of loans transferred   (682)  
Provision for loan losses     7,912
Provision for (recovery of) loan losses 2,166 420  
(Recovery of) provision for loan losses charged to operations 2,166 420 7,912
Charge-offs (3,745) (6,481) (12,527)
Recoveries 1,589 3,590 2,175
Net charge-offs (2,156) (2,891) (10,352)
Ending balance 20,179 20,169 23,322
Purchased Credit Impaired      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 58 755 8
Provision for loan losses (4) (697) 747
Provision for (recovery of) loan losses (4) (697)  
Benefit attributable to the FDIC indemnification asset 29 422 (451)
(Recovery of) provision for loan losses charged to operations 25 (275) 296
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset (29) (422) 451
Ending balance $ 54 $ 58 $ 755