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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 218,795 $ 206,216 $ 204,466      
Provisions 25,692 32,941 20,664      
Charge-offs (36,682) (30,201) (28,348)      
Recoveries 14,088 9,839 9,434      
Net charge-offs (22,594) (20,362) (18,914)      
Ending balance 221,893 218,795 206,216      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 218,795 206,216 204,466 $ 221,893 $ 218,795 $ 206,216
Loans and Leases Evaluated for Impairment [Abstract]            
Net Loans and Leases       23,374,932 21,519,083  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
ALLL for loans and leases acquired with deteriorated credit quality       221,893 218,795  
PCI Loans       762,998 809,169 950,516
Commercial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       396,938 499,970  
Commercial | Construction and land development            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       13,654 20,766  
Commercial | Mortgage            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       358,103 453,013  
Commercial | Other commercial real estate            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       17,124 12,645  
Commercial | Commercial and industrial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       6,374 11,844  
Commercial | Other            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       1,683 1,702  
Commercial | Consumer and Other            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       1,683 1,702  
Noncommercial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       366,060 309,199  
Noncommercial | Consumer            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       2,190 1,772  
Non-PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 205,026 189,904 182,837      
Provisions 29,139 34,870 22,937      
Charge-offs (36,386) (29,587) (25,304)      
Recoveries 14,088 9,839 9,434      
Net charge-offs (22,298) (19,748) (15,870)      
Ending balance 211,867 205,026 189,904      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       9,728 9,210  
ALLL for loans and leases collectively evaluated for impairment       202,139 195,816  
Total allowance for loan and lease losses 205,026 189,904 182,837 211,867 205,026 189,904
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       155,646 136,399  
Loans and leases collectively evaluated for impairment       22,678,181 20,792,310  
Net Loans and Leases       22,833,827 20,928,709  
Non-PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 28,877 16,288 11,961      
Provisions (4,329) 12,871 4,773      
Charge-offs (599) (680) (1,012)      
Recoveries 521 398 566      
Ending balance 24,470 28,877 16,288      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       185 151  
ALLL for loans and leases collectively evaluated for impairment       24,285 28,726  
Total allowance for loan and lease losses 28,877 16,288 11,961 24,470 28,877 16,288
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       788 1,045  
Loans and leases collectively evaluated for impairment       668,427 648,112  
Net Loans and Leases       669,215 649,157  
Non-PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 48,278 69,896 85,189      
Provisions (5,694) (21,912) (15,822)      
Charge-offs (421) (987) (1,498)      
Recoveries 2,842 1,281 2,027      
Ending balance 45,005 48,278 69,896      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       3,648 3,488  
ALLL for loans and leases collectively evaluated for impairment       41,357 44,790  
Total allowance for loan and lease losses 48,278 69,896 85,189 45,005 48,278 69,896
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       73,655 76,361  
Loans and leases collectively evaluated for impairment       9,655,367 8,949,859  
Net Loans and Leases       9,729,022 9,026,220  
Non-PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 3,269 2,168 732      
Provisions 1,280 925 1,569      
Charge-offs (5) 0 (178)      
Recoveries 27 176 45      
Ending balance 4,571 3,269 2,168      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       209 152  
ALLL for loans and leases collectively evaluated for impairment       4,362 3,117  
Total allowance for loan and lease losses 3,269 2,168 732 4,571 3,269 2,168
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       1,857 1,563  
Loans and leases collectively evaluated for impairment       471,576 349,728  
Net Loans and Leases       473,433 351,291  
Non-PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 50,225 43,116 30,727      
Provisions 10,658 14,583 17,432      
Charge-offs (10,926) (9,013) (5,952)      
Recoveries 3,740 1,539 909      
Ending balance 53,697 50,225 43,116      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       665 1,732  
ALLL for loans and leases collectively evaluated for impairment       53,032 48,493  
Total allowance for loan and lease losses 50,225 43,116 30,727 53,697 50,225 43,116
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       7,974 12,600  
Loans and leases collectively evaluated for impairment       2,722,433 2,554,901  
Net Loans and Leases       2,730,407 2,567,501  
Non-PCI Loans | Commercial | Lease financing            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 5,907 5,524 4,286      
Provisions 966 635 1,602      
Charge-offs (995) (442) (402)      
Recoveries 249 190 38      
Ending balance 6,127 5,907 5,524      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       397 75  
ALLL for loans and leases collectively evaluated for impairment       5,730 5,832  
Total allowance for loan and lease losses 5,907 5,524 4,286 6,127 5,907 5,524
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       1,914 1,074  
Loans and leases collectively evaluated for impairment       892,887 825,196  
Net Loans and Leases       894,801 826,270  
Non-PCI Loans | Commercial | Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 3,127 1,855 3,184      
Provisions 2,189 877 (1,420)      
Charge-offs (912) (144) 0      
Recoveries 285 539 91      
Ending balance 4,689 3,127 1,855      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       0 23  
ALLL for loans and leases collectively evaluated for impairment       4,689 3,104  
Total allowance for loan and lease losses 3,127 1,855 3,184 4,689 3,127 1,855
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       521 142  
Loans and leases collectively evaluated for impairment       301,655 340,122  
Net Loans and Leases       302,176 340,264  
Non-PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,596 1,485 892      
Provisions 2,366 45 541      
Charge-offs 0 0 (22)      
Recoveries 0 66 74      
Ending balance 3,962 1,596 1,485      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       68 109  
ALLL for loans and leases collectively evaluated for impairment       3,894 1,487  
Total allowance for loan and lease losses 1,596 1,485 892 3,962 1,596 1,485
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       4,551 2,613  
Loans and leases collectively evaluated for impairment       243,738 228,787  
Net Loans and Leases       248,289 231,400  
Non-PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 14,447 14,105 10,661      
Provisions 2,096 801 4,202      
Charge-offs (1,376) (926) (1,619)      
Recoveries 539 467 861      
Ending balance 15,706 14,447 14,105      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       2,733 2,447  
ALLL for loans and leases collectively evaluated for impairment       12,973 12,000  
Total allowance for loan and lease losses 14,447 14,105 10,661 15,706 14,447 14,105
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       37,842 31,476  
Loans and leases collectively evaluated for impairment       3,485,944 2,857,648  
Net Loans and Leases       3,523,786 2,889,124  
Non-PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 21,013 15,971 18,650      
Provisions 2,509 7,413 (927)      
Charge-offs (2,368) (3,287) (2,925)      
Recoveries 1,282 916 1,173      
Ending balance 22,436 21,013 15,971      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       1,085 366  
ALLL for loans and leases collectively evaluated for impairment       21,351 20,647  
Total allowance for loan and lease losses 21,013 15,971 18,650 22,436 21,013 15,971
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       23,770 7,613  
Loans and leases collectively evaluated for impairment       2,677,755 2,593,731  
Net Loans and Leases       2,701,525 2,601,344  
Non-PCI Loans | Noncommercial | Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 28,287 19,496 16,555      
Provisions 17,098 18,632 10,987      
Charge-offs (18,784) (14,108) (11,696)      
Recoveries 4,603 4,267 3,650      
Ending balance 31,204 28,287 19,496      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       738 667  
ALLL for loans and leases collectively evaluated for impairment       30,466 27,620  
Total allowance for loan and lease losses 28,287 19,496 16,555 31,204 28,287 19,496
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       2,774 1,912  
Loans and leases collectively evaluated for impairment       1,558,399 1,444,226  
Net Loans and Leases       1,561,173 1,446,138  
PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 13,769 16,312 21,629      
Provisions (3,447) (1,929) (2,273)      
Charge-offs (296) (614) (3,044)      
Recoveries 0 0 0      
Net charge-offs (296) (614) (3,044)      
Ending balance 10,026 13,769 16,312      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 13,769 16,312 21,629 10,026 13,769 16,312
PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 483 1,082 150      
Provisions (148) (599) 1,029      
Charge-offs 0 0 (97)      
Recoveries 0 0 0      
Ending balance 335 483 1,082      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 483 1,082 150 335 483 1,082
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       13,654 20,766  
PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 6,423 7,838 10,135      
Provisions 437 (1,249) (1,426)      
Charge-offs (296) (166) (871)      
Recoveries 0 0 0      
Ending balance 6,564 6,423 7,838      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 6,423 7,838 10,135 6,564 6,423 7,838
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       358,103 453,013  
PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 502 773 75      
Provisions (281) (266) 698      
Charge-offs 0 (5) 0      
Recoveries 0 0        
Ending balance 221 502 773      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 502 773 75 221 502 773
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       17,124 12,645  
PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 504 445 1,240      
Provisions (198) 59 (470)      
Charge-offs 0 0 (325)      
Recoveries 0 0 0      
Ending balance 306 504 445      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 504 445 1,240 306 504 445
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       6,374 11,844  
PCI Loans | Noncommercial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       366,060 309,199  
PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 0 0 183      
Provisions 0 0 (183)      
Charge-offs 0 0 0      
Recoveries 0 0 0      
Ending balance 0 0 0      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 0 0 183 0 0 0
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       644 0  
PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 4,818 5,398 5,820      
Provisions (2,701) (209) 72      
Charge-offs 0 (371) (494)      
Recoveries 0 0 0      
Ending balance 2,117 4,818 5,398      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 4,818 5,398 5,820 2,117 4,818 5,398
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       299,318 268,777  
PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 956 523 3,999      
Provisions (697) 433 (2,720)      
Charge-offs 0 0 (756)      
Recoveries 0 0 0      
Ending balance 259 956 523      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 956 523 3,999 259 956 523
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       63,908 38,650  
PCI Loans | Noncommercial | Consumer            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       2,190 1,772  
PCI Loans | Noncommercial | Consumer and Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 83 253 27      
Provisions 141 (98) 727      
Charge-offs 0 (72) (501)      
Recoveries 0 0 0      
Ending balance 224 83 253      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses $ 83 $ 253 $ 27 224 83 $ 253
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       $ 3,873 $ 3,474