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Allowance for Loan Losses, by Loan Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 20,233 $ 20,227  
(Recovery of) provision for loan losses 1,254 2,162  
Benefit attributable to the FDIC indemnification asset 1 29  
(Recovery of) provision for loan losses charged to operations 1,255 2,191 $ 145
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset (1) (29)  
Charge-offs (5,176) (3,745)  
Recoveries 1,637 1,589  
Net charge-offs (3,539) (2,156)  
Ending balance 17,948 20,233 20,227
Commercial Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 13,133 13,047  
(Recovery of) provision for loan losses 30 894  
Benefit attributable to the FDIC indemnification asset   29  
(Recovery of) provision for loan losses charged to operations 30 923  
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset   (29)  
Charge-offs (2,392) (1,282)  
Recoveries 919 474  
Net charge-offs (1,473) (808)  
Ending balance 11,690 13,133 13,047
Consumer Real Estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 6,410 6,510  
(Recovery of) provision for loan losses 343 128  
Benefit attributable to the FDIC indemnification asset 1    
(Recovery of) provision for loan losses charged to operations 344 128  
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset (1)    
Charge-offs (1,612) (906)  
Recoveries 358 678  
Net charge-offs (1,254) (228)  
Ending balance 5,499 6,410 6,510
Consumer and Other      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 690 670  
(Recovery of) provision for loan losses 881 1,140  
(Recovery of) provision for loan losses charged to operations 881 1,140  
Charge-offs (1,172) (1,557)  
Recoveries 360 437  
Net charge-offs (812) (1,120)  
Ending balance 759 690 670
Allowance Excluding Purchased Credit Impaired      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 20,179 20,169  
(Recovery of) provision for loan losses 1,296 2,166  
Charge-offs (5,176) (3,745)  
Recoveries 1,637 1,589  
Net charge-offs (3,539) (2,156)  
Ending balance 17,936 20,179 20,169
Allowance Excluding Purchased Credit Impaired | Commercial Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 13,133 13,010  
(Recovery of) provision for loan losses 30 931  
Charge-offs (2,392) (1,282)  
Recoveries 919 474  
Net charge-offs (1,473) (808)  
Ending balance 11,690 13,133 13,010
Allowance Excluding Purchased Credit Impaired | Consumer Real Estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 6,356 6,489  
(Recovery of) provision for loan losses 385 95  
Charge-offs (1,612) (906)  
Recoveries 358 678  
Net charge-offs (1,254) (228)  
Ending balance 5,487 6,356 6,489
Allowance Excluding Purchased Credit Impaired | Consumer and Other      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 690 670  
(Recovery of) provision for loan losses 881 1,140  
Charge-offs (1,172) (1,557)  
Recoveries 360 437  
Net charge-offs (812) (1,120)  
Ending balance 759 690 670
Purchased Credit Impaired      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 54 58  
(Recovery of) provision for loan losses (42) (4)  
Benefit attributable to the FDIC indemnification asset 1 29  
(Recovery of) provision for loan losses charged to operations (41) 25  
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset (1) (29)  
Ending balance 12 54 58
Purchased Credit Impaired | Commercial Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   37  
(Recovery of) provision for loan losses   (37)  
Benefit attributable to the FDIC indemnification asset   29  
(Recovery of) provision for loan losses charged to operations   (8)  
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset   (29)  
Ending balance     37
Purchased Credit Impaired | Consumer Real Estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 54 21  
(Recovery of) provision for loan losses (42) 33  
Benefit attributable to the FDIC indemnification asset 1    
(Recovery of) provision for loan losses charged to operations (41) 33  
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset (1)    
Ending balance $ 12 $ 54 $ 21