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Allowance for Loan Losses and Credit Quality Information - Schedule of Allowance for Loan Losses and Loan Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance $ 40,845 $ 41,381 $ 39,426 $ 41,244 $ 41,244
Charge-offs (6,606) (2,732) (10,582) (7,046)  
Recoveries 720 502 1,556 2,273  
Provision (credit) 1,513 333 5,374 3,013  
Provision for acquired loans (60)   638    
Ending balance 36,412 39,484 36,412 39,484 39,426
Loans individually evaluated for impairment 2,584 3,867 2,584 3,867  
Loans collectively evaluated for impairment 33,392 35,617 33,392 35,617  
Acquired loans evaluated for impairment     436    
Ending balance 36,412 39,484 36,412 39,484  
Loans individually evaluated for impairment 37,531 40,669 37,531 40,669  
Loans collectively evaluated for impairment 3,195,477 2,973,093 3,195,477 2,973,093  
Acquired nonimpaired loans 121,780 156,671 121,780 156,671 145,800
Acquired impaired loans     13,203 17,229 15,893
Ending balance 3,367,991   3,367,991   3,202,498
Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 14,512 13,346 12,837 12,751 12,751
Charge-offs (4,147) (1,840) (6,184) (3,335)  
Recoveries 84 66 198 873  
Provision (credit) 303 1,833 3,485 3,116  
Provision for acquired loans     416    
Ending balance 10,752 13,405 10,752 13,405 12,837
Loans individually evaluated for impairment 993 1,573 993 1,573  
Loans collectively evaluated for impairment 9,406 11,832 9,406 11,832  
Acquired loans evaluated for impairment     353    
Ending balance 10,752 13,405 10,752 13,405  
Loans individually evaluated for impairment 5,775 3,683 5,775 3,683  
Loans collectively evaluated for impairment 900,660 839,753 900,660 839,753  
Acquired nonimpaired loans 28,998 35,300 28,998 35,300  
Acquired impaired loans     2,627 3,534 3,269
Ending balance 938,060 882,270 938,060 882,270 920,072
Owner Occupied Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 6,733 7,986 6,643 7,638 7,638
Charge-offs (26) (272) (623) (593)  
Recoveries 40 77 62 244  
Provision (credit) (62) 454 574 956  
Provision for acquired loans     29    
Ending balance 6,685 8,245 6,685 8,245 6,643
Loans individually evaluated for impairment   993   993  
Loans collectively evaluated for impairment 6,657 7,252 6,657 7,252  
Acquired loans evaluated for impairment     28    
Ending balance 6,685 8,245 6,685 8,245  
Loans individually evaluated for impairment 1,170 3,390 1,170 3,390  
Loans collectively evaluated for impairment 770,246 760,680 770,246 760,680  
Acquired nonimpaired loans 37,937 41,858 37,937 41,858  
Acquired impaired loans     2,195 2,329 2,264
Ending balance 811,548 808,257 811,548 808,257 788,598
Commercial Mortgages [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 6,831 7,617 7,266 6,932 6,932
Charge-offs (804) (101) (808) (261)  
Recoveries 14 4 83 43  
Provision (credit) 231 (1,097) (508) (291)  
Provision for acquired loans (71)   168    
Ending balance 6,201 6,423 6,201 6,423 7,266
Loans individually evaluated for impairment 241 240 241 240  
Loans collectively evaluated for impairment 5,907 6,183 5,907 6,183  
Acquired loans evaluated for impairment     53    
Ending balance 6,201 6,423 6,201 6,423  
Loans individually evaluated for impairment 6,805 8,760 6,805 8,760  
Loans collectively evaluated for impairment 836,556 737,394 836,556 737,394  
Acquired nonimpaired loans 25,555 41,071 25,555 41,071  
Acquired impaired loans     5,400 6,687 5,976
Ending balance 874,316 793,912 874,316 793,912 805,459
Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 3,313 2,319 2,596 3,326 3,326
Charge-offs       (88)  
Recoveries 19 8 179 192  
Provision (credit) 306 (897) 863 (2,000)  
Provision for acquired loans 104   104    
Ending balance 3,742 1,430 3,742 1,430 2,596
Loans individually evaluated for impairment 214   214    
Loans collectively evaluated for impairment 3,527 1,430 3,527 1,430  
Acquired loans evaluated for impairment     1    
Ending balance 3,742 1,430 3,742 1,430  
Loans individually evaluated for impairment 1,419 1,419 1,419 1,419  
Loans collectively evaluated for impairment 190,925 131,996 190,925 131,996  
Acquired nonimpaired loans 8,223 10,666 8,223 10,666  
Acquired impaired loans     2,594 4,135 3,863
Ending balance 203,161 148,216 203,161 148,216 142,497
Residential [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 2,709 2,759 2,523 3,078 3,078
Charge-offs (130) (147) (397) (674)  
Recoveries 158 86 195 129  
Provision (credit) (362) (6) 50 159  
Provision for acquired loans (92)   (88)    
Ending balance 2,283 2,692 2,283 2,692 2,523
Loans individually evaluated for impairment 934 850 934 850  
Loans collectively evaluated for impairment 1,348 1,842 1,348 1,842  
Acquired loans evaluated for impairment     1    
Ending balance 2,283 2,692 2,283 2,692  
Loans individually evaluated for impairment 14,613 16,807 14,613 16,807  
Loans collectively evaluated for impairment 169,566 193,792 169,566 193,792  
Acquired nonimpaired loans 15,137 18,105 15,137 18,105  
Acquired impaired loans     380 517 512
Ending balance 199,696 229,221 199,696 229,221 218,329
Consumer [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 5,788 6,299 6,041 6,494 6,494
Charge-offs (1,499) (372) (2,570) (2,095)  
Recoveries 405 261 839 792  
Provision (credit) 1,086 56 1,460 1,053  
Provision for acquired loans (1)   9    
Ending balance 5,779 6,244 5,779 6,244 6,041
Loans individually evaluated for impairment 202 211 202 211  
Loans collectively evaluated for impairment 5,577 6,033 5,577 6,033  
Ending balance 5,779 6,244 5,779 6,244  
Loans individually evaluated for impairment 7,749 6,610 7,749 6,610  
Loans collectively evaluated for impairment 327,524 309,478 327,524 309,478  
Acquired nonimpaired loans 5,930 9,671 5,930 9,671  
Acquired impaired loans     7 27 9
Ending balance 341,210 325,786 341,210 325,786 327,543
Estimation/Complexity Risk [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 959 1,055 1,520 1,025 1,025
Provision (credit) 11 (10) (550) 20  
Ending balance 970 1,045 970 1,045 $ 1,520
Loans collectively evaluated for impairment 970 1,045 970 1,045  
Ending balance $ 970 $ 1,045 $ 970 $ 1,045