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Loans and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Activity in ALLL by class of loans          
Beginning balance $ 37,436 $ 37,092 $ 37,656 $ 35,745  
Charge-offs (500) (629) (1,563) (2,364)  
Recoveries 89 108 511 389  
Net charge-offs (411) (521) (1,052) (1,975)  
Provisions charged to operations 233 885 654 3,686  
Ending balance 37,258 37,456 37,258 37,456  
Individually evaluated for impairment 6,928 8,110 6,928 8,110  
Collectively evaluated for impairment 30,330 29,346 30,330 29,346  
Allowance for credit losses: Balance at end of period 37,258 37,456 37,258 37,456  
Individually evaluated for impairment 68,015 73,956 68,015 73,956  
Collectively evaluated for impairment 3,039,138 2,890,906 3,039,138 2,890,906  
Loans acquired with deteriorated credit quality 8,943 19,252 8,943 19,252  
Ending balance 3,116,096 2,984,114 3,116,096 2,984,114 3,013,498
Non-residential real estate [Member]
          
Activity in ALLL by class of loans          
Beginning balance 14,349 13,651 13,948 13,142  
Charge-offs (30) (67) (158) (336)  
Recoveries 17 7 48 23  
Net charge-offs (13) (60) (110) (313)  
Provisions charged to operations (453) 290 45 1,052  
Ending balance 13,883 13,881 13,883 13,881  
Individually evaluated for impairment 2,396 3,351 2,396 3,351  
Collectively evaluated for impairment 11,487 10,530 11,487 10,530  
Allowance for credit losses: Balance at end of period 13,883 13,881 13,883 13,881  
Individually evaluated for impairment 37,195 40,700 37,195 40,700  
Collectively evaluated for impairment 1,112,375 988,849 1,112,375 988,849  
Ending balance 1,149,570 1,029,549 1,149,570 1,029,549  
Residential real estate [Member]
          
Activity in ALLL by class of loans          
Beginning balance 10,006 9,380 9,764 8,957  
Charge-offs (157) (21) (288) (522)  
Recoveries 9 20 118 115  
Net charge-offs (148) (1) (170) (407)  
Provisions charged to operations (137) 472 127 1,301  
Ending balance 9,721 9,851 9,721 9,851  
Individually evaluated for impairment 2,305 2,681 2,305 2,681  
Collectively evaluated for impairment 7,416 7,170 7,416 7,170  
Allowance for credit losses: Balance at end of period 9,721 9,851 9,721 9,851  
Individually evaluated for impairment 19,264 21,200 19,264 21,200  
Collectively evaluated for impairment 718,534 674,716 718,534 674,716  
Ending balance 737,798 695,916 737,798 695,916  
Non-consumer non-real estate [Member]
          
Activity in ALLL by class of loans          
Beginning balance 8,558 9,334 9,156 9,587  
Charge-offs (119) (210) (449) (394)  
Recoveries 19 46 144 130  
Net charge-offs (100) (164) (305) (264)  
Provisions charged to operations 712 (460) 319 (613)  
Ending balance 9,170 8,710 9,170 8,710  
Individually evaluated for impairment 1,692 1,528 1,692 1,528  
Collectively evaluated for impairment 7,478 7,182 7,478 7,182  
Allowance for credit losses: Balance at end of period 9,170 8,710 9,170 8,710  
Individually evaluated for impairment 8,976 9,012 8,976 9,012  
Collectively evaluated for impairment 724,930 683,498 724,930 683,498  
Ending balance 733,906 692,510 733,906 692,510  
Consumer non-real estate [Member]
          
Activity in ALLL by class of loans          
Beginning balance 2,282 2,237 2,315 2,301  
Charge-offs (117) (72) (308) (400)  
Recoveries 42 24 157 92  
Net charge-offs (75) (48) (151) (308)  
Provisions charged to operations 162 136 205 332  
Ending balance 2,369 2,325 2,369 2,325  
Individually evaluated for impairment 315 318 315 318  
Collectively evaluated for impairment 2,054 2,007 2,054 2,007  
Allowance for credit losses: Balance at end of period 2,369 2,325 2,369 2,325  
Individually evaluated for impairment 2,316 2,787 2,316 2,787  
Collectively evaluated for impairment 205,427 198,845 205,427 198,845  
Ending balance 207,743 201,632 207,743 201,632  
Other loans [Member]
          
Activity in ALLL by class of loans          
Beginning balance 1,854 1,712 1,886 1,758  
Charge-offs (24) (121) (231) (243)  
Recoveries 2 2 33 9  
Net charge-offs (22) (119) (198) (234)  
Provisions charged to operations 6 156 150 225  
Ending balance 1,838 1,749 1,838 1,749  
Individually evaluated for impairment 220 232 220 232  
Collectively evaluated for impairment 1,618 1,517 1,618 1,517  
Allowance for credit losses: Balance at end of period 1,838 1,749 1,838 1,749  
Individually evaluated for impairment 264 257 264 257  
Collectively evaluated for impairment 150,218 158,286 150,218 158,286  
Ending balance 150,482 158,543 150,482 158,543  
Acquired loans [Member]
          
Activity in ALLL by class of loans          
Beginning balance 387 778 587    
Charge-offs (53) (138) (129) (469)  
Recoveries   9 11 20  
Net charge-offs (53) (129) (118) (449)  
Provisions charged to operations (57) 291 (192) 1,389  
Ending balance 277 940 277 940  
Collectively evaluated for impairment 277 940 277 940  
Allowance for credit losses: Balance at end of period 277 940 277 940  
Collectively evaluated for impairment 127,654 186,712 127,654 186,712  
Loans acquired with deteriorated credit quality 8,943 19,252 8,943 19,252  
Ending balance $ 136,597 $ 205,964 $ 136,597 $ 205,964