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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 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance $ 39,507 $ 41,328 $ 39,426 $ 41,244 $ 41,244
Charge-offs (2,942) (1,159) (3,976) (4,314)  
Recoveries 507 1,162 836 1,771  
Provision (credit) 3,025 50 3,811 2,680  
Provision for acquired loans 748   748    
Ending balance 40,845 41,381 40,845 41,381 39,426
Loans individually evaluated for impairment 6,651 4,401 6,651 4,401  
Loans collectively evaluated for impairment 33,446 36,980 33,446 36,980  
Acquired loans evaluated for impairment     748    
Ending balance 40,845 41,381 40,845 41,381  
Loans individually evaluated for impairment 41,328 45,840 41,328 45,840  
Loans collectively evaluated for impairment 3,157,302 2,995,637 3,157,302 2,995,637  
Acquired nonimpaired loans 129,858   129,858   107,300
Acquired impaired loans     15,017   15,893
Ending balance 3,343,505 3,041,477 3,343,505 3,041,477 3,202,498
Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 13,048 12,404 12,837 12,751 12,751
Charge-offs (1,903) (382) (2,037) (1,495)  
Recoveries 91 483 114 807  
Provision (credit) 2,788 841 3,110 1,283  
Provision for acquired loans 488   488    
Ending balance 14,512 13,346 14,512 13,346 12,837
Loans individually evaluated for impairment 4,819 1,881 4,819 1,881  
Loans collectively evaluated for impairment 9,205 11,465 9,205 11,465  
Acquired loans evaluated for impairment     488    
Ending balance 14,512 13,346 14,512 13,346  
Loans individually evaluated for impairment 9,938 4,109 9,938 4,109  
Loans collectively evaluated for impairment 893,774 853,245 893,774 853,245  
Acquired nonimpaired loans 29,894   29,894    
Acquired impaired loans     3,159   3,269
Ending balance 936,765 857,354 936,765 857,354 920,072
Owner Occupied Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 7,039 8,789 6,643 7,638 7,638
Charge-offs (272) (124) (597) (321)  
Recoveries 18 161 22 167  
Provision (credit) (80) (840) 637 502  
Provision for acquired loans 28   28    
Ending balance 6,733 7,986 6,733 7,986 6,643
Loans individually evaluated for impairment 75 1,157 75 1,157  
Loans collectively evaluated for impairment 6,630 6,829 6,630 6,829  
Acquired loans evaluated for impairment     28    
Ending balance 6,733 7,986 6,733 7,986  
Loans individually evaluated for impairment 1,389 4,928 1,389 4,928  
Loans collectively evaluated for impairment 750,514 773,329 750,514 773,329  
Acquired nonimpaired loans 39,132   39,132    
Acquired impaired loans     2,027   2,264
Ending balance 793,062 778,257 793,062 778,257 788,598
Commercial Mortgages [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 6,524 7,363 7,266 6,932 6,932
Charge-offs     (4) (160)  
Recoveries 28 2 69 39  
Provision (credit) 50 252 (729) 806  
Provision for acquired loans 229   229    
Ending balance 6,831 7,617 6,831 7,617 7,266
Loans individually evaluated for impairment 177 307 177 307  
Loans collectively evaluated for impairment 6,425 7,310 6,425 7,310  
Acquired loans evaluated for impairment     229    
Ending balance 6,831 7,617 6,831 7,617  
Loans individually evaluated for impairment 7,329 13,483 7,329 13,483  
Loans collectively evaluated for impairment 827,381 749,607 827,381 749,607  
Acquired nonimpaired loans 29,558   29,558    
Acquired impaired loans     5,884   5,976
Ending balance 870,152 763,090 870,152 763,090 805,459
Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 2,952 2,716 2,596 3,326 3,326
Charge-offs       (88)  
Recoveries 111 177 160 184  
Provision (credit) 249 (574) 556 (1,103)  
Provision for acquired loans 1   1    
Ending balance 3,313 2,319 3,313 2,319 2,596
Loans individually evaluated for impairment 214   214    
Loans collectively evaluated for impairment 3,098 2,319 3,098 2,319  
Acquired loans evaluated for impairment     1    
Ending balance 3,313 2,319 3,313 2,319  
Loans individually evaluated for impairment 1,419   1,419    
Loans collectively evaluated for impairment 188,251 119,333 188,251 119,333  
Acquired nonimpaired loans 8,696   8,696    
Acquired impaired loans     3,479   3,863
Ending balance 201,845 119,333 201,845 119,333 142,497
Residential [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 2,380 2,765 2,523 3,078 3,078
Charge-offs (147) (163) (267) (527)  
Recoveries 26 25 37 43  
Provision (credit) 448 132 414 165  
Provision for acquired loans 2   2    
Ending balance 2,709 2,759 2,709 2,759 2,523
Loans individually evaluated for impairment 1,178 872 1,178 872  
Loans collectively evaluated for impairment 1,529 1,887 1,529 1,887  
Acquired loans evaluated for impairment     2    
Ending balance 2,709 2,759 2,709 2,759  
Loans individually evaluated for impairment 15,198 17,743 15,198 17,743  
Loans collectively evaluated for impairment 181,169 193,180 181,169 193,180  
Acquired nonimpaired loans 15,970   15,970    
Acquired impaired loans     460   512
Ending balance 212,797 210,923 212,797 210,923 218,329
Consumer [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 6,026 6,249 6,041 6,494 6,494
Charge-offs (620) (490) (1,071) (1,723)  
Recoveries 233 314 434 531  
Provision (credit) 149 226 384 997  
Ending balance 5,788 6,299 5,788 6,299 6,041
Loans individually evaluated for impairment 188 184 188 184  
Loans collectively evaluated for impairment 5,600 6,115 5,600 6,115  
Ending balance 5,788 6,299 5,788 6,299  
Loans individually evaluated for impairment 6,055 5,577 6,055 5,577  
Loans collectively evaluated for impairment 316,213 306,943 316,213 306,943  
Acquired nonimpaired loans 6,608   6,608    
Acquired impaired loans     8   9
Ending balance 328,884 312,520 328,884 312,520 327,543
Estimation/Complexity Risk [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 1,538 1,042 1,520 1,025 1,025
Provision (credit) (579) 13 (561) 30  
Ending balance 959 1,055 959 1,055 $ 1,520
Loans collectively evaluated for impairment 959 1,055 959 1,055  
Ending balance $ 959 $ 1,055 $ 959 $ 1,055