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Allowance for Loan Losses, by Loan Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 21,099 $ 20,258 $ 20,233 $ 20,227
(Recovery of) provision for loan losses (1,154) 306 754 1,728
Benefit attributable to the FDIC indemnification asset   75 1 29
(Recovery of) provision for loan losses charged to operations (1,154) 381 755 1,757
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset   (75) (1) (29)
Charge-offs (772) (689) (2,691) (2,940)
Recoveries 460 252 1,337 1,112
Net recoveries (charge-offs) (312) (437) (1,354) (1,828)
Ending balance 19,633 20,127 19,633 20,127
Commercial Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 13,689 12,995 13,133 13,047
(Recovery of) provision for loan losses (726) 6 (200) 717
Benefit attributable to the FDIC indemnification asset       30
(Recovery of) provision for loan losses charged to operations (726) 6 (200) 747
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset       (30)
Charge-offs (272) (150) (747) (1,111)
Recoveries 295 102 800 300
Net recoveries (charge-offs) 23 (48) 53 (811)
Ending balance 12,986 12,953 12,986 12,953
Consumer Real Estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 6,637 6,582 6,410 6,510
(Recovery of) provision for loan losses (575) (74) 394 135
Benefit attributable to the FDIC indemnification asset   75 1 (1)
(Recovery of) provision for loan losses charged to operations (575) 1 395 134
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset   (75) (1) 1
Charge-offs (207) (130) (1,135) (622)
Recoveries 89 86 275 441
Net recoveries (charge-offs) (118) (44) (860) (181)
Ending balance 5,944 6,464 5,944 6,464
Consumer and Other        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 773 681 690 670
(Recovery of) provision for loan losses 147 374 560 876
(Recovery of) provision for loan losses charged to operations 147 374 560 876
Charge-offs (293) (409) (809) (1,207)
Recoveries 76 64 262 371
Net recoveries (charge-offs) (217) (345) (547) (836)
Ending balance 703 710 703 710
Allowance Excluding Purchased Credit Impaired        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 21,087 20,144 20,179 20,169
(Recovery of) provision for loan losses (1,154) 400 796 1,766
Charge-offs (772) (689) (2,691) (2,940)
Recoveries 460 252 1,337 1,112
Net recoveries (charge-offs) (312) (437) (1,354) (1,828)
Ending balance 19,621 20,107 19,621 20,107
Allowance Excluding Purchased Credit Impaired | Commercial Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 13,689 12,995 13,133 13,010
(Recovery of) provision for loan losses (726) 6 (200) 754
Charge-offs (272) (150) (747) (1,111)
Recoveries 295 102 800 300
Net recoveries (charge-offs) 23 (48) 53 (811)
Ending balance 12,986 12,953 12,986 12,953
Allowance Excluding Purchased Credit Impaired | Consumer Real Estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 6,625 6,468 6,356 6,489
(Recovery of) provision for loan losses (575) 20 436 136
Charge-offs (207) (130) (1,135) (622)
Recoveries 89 86 275 441
Net recoveries (charge-offs) (118) (44) (860) (181)
Ending balance 5,932 6,444 5,932 6,444
Allowance Excluding Purchased Credit Impaired | Consumer and Other        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 773 681 690 670
(Recovery of) provision for loan losses 147 374 560 876
Charge-offs (293) (409) (809) (1,207)
Recoveries 76 64 262 371
Net recoveries (charge-offs) (217) (345) (547) (836)
Ending balance 703 710 703 710
Purchased Credit Impaired        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 12 114 54 58
(Recovery of) provision for loan losses   (94) (42) (38)
Benefit attributable to the FDIC indemnification asset   75 1 29
(Recovery of) provision for loan losses charged to operations   (19) (41) (9)
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset   (75) (1) (29)
Ending balance 12 20 12 20
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       30
(Recovery of) provision for loan losses charged to operations       (7)
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset       (30)
Purchased Credit Impaired | Consumer Real Estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 12 114 54 21
(Recovery of) provision for loan losses   (94) (42) (1)
Benefit attributable to the FDIC indemnification asset   75 1 (1)
(Recovery of) provision for loan losses charged to operations   (19) (41) (2)
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset   (75) (1) 1
Ending balance $ 12 $ 20 $ 12 $ 20