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Loans and Allowance for Loan Losses - Activity in ALLL by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance $ 38,664 $ 37,633 $ 38,725 $ 37,656  
Charge-offs (347) (531) (880) (1,063)  
Recoveries 149 86 321 422  
Net charge-offs (198) (445) (559) (641)  
Provisions charged to operations 516 248 816 421  
Ending balance 38,982 37,436 38,982 37,436  
Individually evaluated for impairment 6,516 7,680 6,516 7,680  
Collectively evaluated for impairment 32,466 29,756 32,466 29,756  
Individually evaluated for impairment 61,659 69,929 61,659 69,929  
Collectively evaluated for impairment 3,176,974 2,983,606 3,176,974 2,983,606  
Loans acquired with deteriorated credit quality 6,451 11,904 6,451 11,904  
Ending balance 3,245,084 3,065,439 3,245,084 3,065,439 3,242,427
Non-residential real estate [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 15,331 14,109 14,969 13,948  
Charge-offs (3) (7) (21) (128)  
Recoveries 7 (6) 26 31  
Net charge-offs 4 (13) 5 (97)  
Provisions charged to operations 245 253 606 498  
Ending balance 15,580 14,349 15,580 14,349  
Individually evaluated for impairment 2,880 2,986 2,880 2,986  
Collectively evaluated for impairment 12,700 11,363 12,700 11,363  
Individually evaluated for impairment 35,568 38,278 35,568 38,278  
Collectively evaluated for impairment 1,215,756 1,102,773 1,215,756 1,102,773  
Loans acquired with deteriorated credit quality            
Ending balance 1,251,324 1,141,051 1,251,324 1,141,051  
Residential real estate [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 9,921 9,762 9,815 9,764  
Charge-offs (99) (95) (250) (131)  
Recoveries 29 13 42 109  
Net charge-offs (70) (82) (208) (22)  
Provisions charged to operations 231 326 475 264  
Ending balance 10,082 10,006 10,082 10,006  
Individually evaluated for impairment 2,016 2,760 2,016 2,760  
Collectively evaluated for impairment 8,066 7,246 8,066 7,246  
Individually evaluated for impairment 17,531 20,710 17,531 20,710  
Collectively evaluated for impairment 775,223 700,439 775,223 700,439  
Loans acquired with deteriorated credit quality            
Ending balance 792,754 721,149 792,754 721,149  
Non-consumer non-real estate [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 8,982 9,198 9,385 9,156  
Charge-offs (69) (313) (105) (330)  
Recoveries 18 26 49 124  
Net charge-offs (51) (287) (56) (206)  
Provisions charged to operations (180) (353) (578) (392)  
Ending balance 8,751 8,558 8,751 8,558  
Individually evaluated for impairment 1,124 1,436 1,124 1,436  
Collectively evaluated for impairment 7,627 7,122 7,627 7,122  
Individually evaluated for impairment 6,075 8,377 6,075 8,377  
Collectively evaluated for impairment 743,587 689,039 743,587 689,039  
Loans acquired with deteriorated credit quality            
Ending balance 749,662 697,416 749,662 697,416  
Consumer non-real estate [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 2,384 2,283 2,451 2,315  
Charge-offs (155) (77) (295) (191)  
Recoveries 61 32 137 116  
Net charge-offs (94) (45) (158) (75)  
Provisions charged to operations 99 44 96 42  
Ending balance 2,389 2,282 2,389 2,282  
Individually evaluated for impairment 265 302 265 302  
Collectively evaluated for impairment 2,124 1,980 2,124 1,980  
Individually evaluated for impairment 2,205 2,455 2,205 2,455  
Collectively evaluated for impairment 215,175 197,972 215,175 197,972  
Loans acquired with deteriorated credit quality            
Ending balance 217,380 200,427 217,380 200,427  
Other loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 1,822 1,850 1,885 1,886  
Charge-offs (20) (27) (159) (207)  
Recoveries 31 12 31 31  
Net charge-offs 11 (15) (128) (176)  
Provisions charged to operations 128 19 204 144  
Ending balance 1,961 1,854 1,961 1,854  
Individually evaluated for impairment 231 196 231 196  
Collectively evaluated for impairment 1,730 1,658 1,730 1,658  
Individually evaluated for impairment 280 109 280 109  
Collectively evaluated for impairment 147,225 155,875 147,225 155,875  
Loans acquired with deteriorated credit quality            
Ending balance 147,505 155,984 147,505 155,984  
Acquired loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 224 431 220 587  
Charge-offs (1) (12) (50) (76)  
Recoveries 3 9 36 11  
Net charge-offs 2 (3) (14) (65)  
Provisions charged to operations (7) (41) 13 (135)  
Ending balance 219 387 219 387  
Individually evaluated for impairment            
Collectively evaluated for impairment 219 387 219 387  
Individually evaluated for impairment            
Collectively evaluated for impairment 80,008 137,508 80,008 137,508  
Loans acquired with deteriorated credit quality 6,451 11,904 6,451 11,904  
Ending balance $ 86,459 $ 149,412 $ 86,459 $ 149,412