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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance $ 37,556 $ 39,507 $ 37,089 $ 39,426 $ 39,426
Charge-offs (1,765) (2,942) (2,632) (3,976)  
Recoveries 701 507 1,255 836  
Provision (credit) 1,047 3,025 1,954 3,811  
Provision for acquired loans 207 748 80 748  
Ending balance 37,746 40,845 37,746 40,845 37,089
Loans individually evaluated for impairment 1,834 6,651 1,834 6,651  
Loans collectively evaluated for impairment 35,617 33,446 35,617 33,446  
Acquired loans evaluated for impairment     295 748  
Ending balance 37,746 40,845 37,746 40,845  
Loans individually evaluated for impairment 28,898 41,328 28,898 41,328  
Loans collectively evaluated for impairment 3,460,885 3,157,302 3,460,885 3,157,302  
Acquired nonimpaired loans 330,660 129,858 330,660 129,858 371,100
Acquired impaired loans     27,072 15,017 32,687
Ending balance 3,847,515 3,343,505 3,847,515 3,343,505 3,774,639
Owner- Occupied Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 6,702 7,039 6,670 6,643 6,643
Charge-offs (141) (272) (141) (597)  
Recoveries 13 18 51 22  
Provision (credit) 133 (80) 127 637  
Provision for acquired loans 16 28 16 28  
Ending balance 6,723 6,733 6,723 6,733 6,670
Loans individually evaluated for impairment   75   75  
Loans collectively evaluated for impairment 6,686 6,630 6,686 6,630  
Acquired loans evaluated for impairment     37 28  
Ending balance 6,723 6,733 6,723 6,733  
Loans individually evaluated for impairment 838 1,389 838 1,389  
Loans collectively evaluated for impairment 857,270 750,514 857,270 750,514  
Acquired nonimpaired loans 70,465 39,132 70,465 39,132  
Acquired impaired loans     9,757 2,027 4,688
Ending balance 938,330 793,062 938,330 793,062 880,643
Commercial Mortgages [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 6,516 6,524 6,487 7,266 7,266
Charge-offs (61)   (78) (4)  
Recoveries 34 28 113 69  
Provision (credit) 1,598 50 1,561 (729)  
Provision for acquired loans 48 229 52 229  
Ending balance 8,135 6,831 8,135 6,831 6,487
Loans individually evaluated for impairment   177   177  
Loans collectively evaluated for impairment 8,009 6,425 8,009 6,425  
Acquired loans evaluated for impairment     126 229  
Ending balance 8,135 6,831 8,135 6,831  
Loans individually evaluated for impairment 1,702 7,329 1,702 7,329  
Loans collectively evaluated for impairment 869,771 827,381 869,771 827,381  
Acquired nonimpaired loans 108,212 29,558 108,212 29,558  
Acquired impaired loans     10,560 5,884 10,513
Ending balance 990,245 870,152 990,245 870,152 966,698
Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 3,609 2,952 3,521 2,596 2,596
Charge-offs (3)   (29)    
Recoveries   111 46 160  
Provision (credit) (352) 249 (280) 556  
Provision for acquired loans 54 1 50 1  
Ending balance 3,308 3,313 3,308 3,313 3,521
Loans individually evaluated for impairment 211 214 211 214  
Loans collectively evaluated for impairment 3,038 3,098 3,038 3,098  
Acquired loans evaluated for impairment     59 1  
Ending balance 3,308 3,313 3,308 3,313  
Loans individually evaluated for impairment 1,419 1,419 1,419 1,419  
Loans collectively evaluated for impairment 181,440 188,251 181,440 188,251  
Acquired nonimpaired loans 12,086 8,696 12,086 8,696  
Acquired impaired loans     4,094 3,479 3,544
Ending balance 199,039 201,845 199,039 201,845 245,773
Estimation/Complexity Risk [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 1,024 1,538 1,010 1,520 1,520
Provision (credit) (1,024) (579) (1,010) (561)  
Ending balance   959   959 1,010
Loans collectively evaluated for impairment   959   959  
Ending balance   959   959  
Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 11,482 13,048 11,156 12,837 12,837
Charge-offs (727) (1,903) (906) (2,037)  
Recoveries 224 91 334 114  
Provision (credit) 353 2,788 837 3,110  
Provision for acquired loans 70 488 (19) 488  
Ending balance 11,402 14,512 11,402 14,512 11,156
Loans individually evaluated for impairment 426 4,819 426 4,819  
Loans collectively evaluated for impairment 10,923 9,205 10,923 9,205  
Acquired loans evaluated for impairment     53 488  
Ending balance 11,402 14,512 11,402 14,512  
Loans individually evaluated for impairment 2,558 9,938 2,558 9,938  
Loans collectively evaluated for impairment 1,045,918 893,774 1,045,918 893,774  
Acquired nonimpaired loans 58,423 29,894 58,423 29,894  
Acquired impaired loans     1,711 3,159 12,985
Ending balance 1,108,610 936,765 1,108,610 936,765 1,061,597
Residential [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 2,269 2,380 2,281 2,523 2,523
Charge-offs (15) (147) (29) (267)  
Recoveries 57 26 79 37  
Provision (credit) 22 448 2 414  
Provision for acquired loans 19 2 19 2  
Ending balance 2,352 2,709 2,352 2,709 2,281
Loans individually evaluated for impairment 992 1,178 992 1,178  
Loans collectively evaluated for impairment 1,340 1,529 1,340 1,529  
Acquired loans evaluated for impairment     20 2  
Ending balance 2,352 2,709 2,352 2,709  
Loans individually evaluated for impairment 14,416 15,198 14,416 15,198  
Loans collectively evaluated for impairment 153,811 181,169 153,811 181,169  
Acquired nonimpaired loans 67,484 15,970 67,484 15,970  
Acquired impaired loans     946 460 950
Ending balance 236,657 212,797 236,657 212,797 259,679
Consumer Loan Commitments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 5,954 6,026 5,964 6,041 6,041
Charge-offs (818) (620) (1,449) (1,071)  
Recoveries 373 233 632 434  
Provision (credit) 317 149 717 384  
Provision for acquired loans     (38)    
Ending balance 5,826 5,788 5,826 5,788 5,964
Loans individually evaluated for impairment 205 188 205 188  
Loans collectively evaluated for impairment 5,621 5,600 5,621 5,600  
Ending balance 5,826 5,788 5,826 5,788  
Loans individually evaluated for impairment 7,965 6,055 7,965 6,055  
Loans collectively evaluated for impairment 352,675 316,213 352,675 316,213  
Acquired nonimpaired loans 13,990 6,608 13,990 6,608  
Acquired impaired loans     4 8 7
Ending balance $ 374,634 $ 328,884 $ 374,634 $ 328,884 $ 360,249