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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Net loans and leases         $ 22,642,667 $ 21,519,083    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         894,863 809,169 $ 921,467 $ 950,516
Allowance for loan and lease losses         228,798 218,795    
Commercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         477,057 499,970    
Commercial | Construction and land development                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         18,660 20,766    
Commercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         426,778 453,013    
Commercial | Other commercial real estate                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         21,409 12,645    
Commercial | Commercial and industrial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         9,307 11,844    
Commercial | Other                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         903 1,702    
Noncommercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         417,806 309,199    
Noncommercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         350,038 268,777    
Noncommercial | Revolving mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         65,949 38,650    
Noncommercial | Consumer                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         1,819 1,772    
Non-PCI Loans                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance         9,664 9,210    
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance $ 210,019 $ 193,026 $ 205,026 $ 189,904        
Provision for Loan, Lease, and Other Losses 9,752 6,708 20,828 13,548        
Charge-offs (9,423) (5,841) (18,194) (12,061)        
Recoveries 4,954 2,560 7,642 5,062        
Ending balance 215,302 196,453 215,302 196,453        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         143,381 136,399    
Loans and leases collectively evaluated for impairment         21,833,221 20,792,310    
Net loans and leases         21,976,602 20,928,709    
ALLL for loans and leases individually evaluated for impairment         9,664 9,210    
ALLL for loans and leases collectively evaluated for impairment         205,638 195,816    
Total allowance for loan and lease losses 210,019 193,026 205,026 189,904 215,302 205,026 196,453 189,904
Non-PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 31,391 16,885 28,877 16,288        
Provision for Loan, Lease, and Other Losses 2,372 291 4,908 1,234        
Charge-offs (413) (136) (490) (562)        
Recoveries 209 129 264 209        
Ending balance 33,559 17,169 33,559 17,169        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         828 1,045    
Loans and leases collectively evaluated for impairment         739,463 648,112    
Net loans and leases         740,291 649,157    
ALLL for loans and leases individually evaluated for impairment         93 151    
ALLL for loans and leases collectively evaluated for impairment         33,466 28,726    
Total allowance for loan and lease losses 31,391 16,885 28,877 16,288 33,559 28,877 17,169 16,288
Non-PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 48,611 70,456 48,278 69,896        
Provision for Loan, Lease, and Other Losses 639 701 645 1,096        
Charge-offs (235) (44) (272) (134)        
Recoveries 731 500 1,095 755        
Ending balance 49,746 71,613 49,746 71,613        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         74,668 76,361    
Loans and leases collectively evaluated for impairment         9,226,486 8,949,859    
Net loans and leases         9,301,154 9,026,220    
ALLL for loans and leases individually evaluated for impairment         4,166 3,488    
ALLL for loans and leases collectively evaluated for impairment         45,580 44,790    
Total allowance for loan and lease losses 48,611 70,456 48,278 69,896 49,746 48,278 71,613 69,896
Non-PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 3,572 2,207 3,269 2,168        
Provision for Loan, Lease, and Other Losses 33 (79) 337 (184)        
Charge-offs 0 0 (5) 0        
Recoveries 7 10 11 154        
Ending balance 3,612 2,138 3,612 2,138        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,567 1,563    
Loans and leases collectively evaluated for impairment         361,772 349,728    
Net loans and leases         363,339 351,291    
ALLL for loans and leases individually evaluated for impairment         225 152    
ALLL for loans and leases collectively evaluated for impairment         3,387 3,117    
Total allowance for loan and lease losses 3,572 2,207 3,269 2,168 3,612 3,269 2,138 2,168
Non-PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 50,829 44,479 50,225 43,116        
Provision for Loan, Lease, and Other Losses 968 81 4,560 2,282        
Charge-offs (3,121) (1,177) (6,374) (2,494)        
Recoveries 2,392 525 2,657 1,004        
Ending balance 51,068 43,908 51,068 43,908        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         9,756 12,600    
Loans and leases collectively evaluated for impairment         2,543,856 2,554,901    
Net loans and leases         2,553,612 2,567,501    
ALLL for loans and leases individually evaluated for impairment         623 1,732    
ALLL for loans and leases collectively evaluated for impairment         50,445 48,493    
Total allowance for loan and lease losses 50,829 44,479 50,225 43,116 51,068 50,225 43,908 43,116
Non-PCI Loans | Commercial | Lease financing                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 6,315 5,422 5,907 5,524        
Provision for Loan, Lease, and Other Losses 186 343 761 62        
Charge-offs (97) 0 (270) 0        
Recoveries 0 1 6 180        
Ending balance 6,404 5,766 6,404 5,766        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,785 1,074    
Loans and leases collectively evaluated for impairment         852,158 825,196    
Net loans and leases         853,943 826,270    
ALLL for loans and leases individually evaluated for impairment         66 75    
ALLL for loans and leases collectively evaluated for impairment         6,338 5,832    
Total allowance for loan and lease losses 6,315 5,422 5,907 5,524 6,404 5,907 5,766 5,524
Non-PCI Loans | Commercial | Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 3,534 1,777 3,127 1,855        
Provision for Loan, Lease, and Other Losses (214) 37 241 (290)        
Charge-offs (64) (88) (187) (160)        
Recoveries 46 29 121 350        
Ending balance 3,302 1,755 3,302 1,755        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         662 142    
Loans and leases collectively evaluated for impairment         485,911 340,122    
Net loans and leases         486,573 340,264    
ALLL for loans and leases individually evaluated for impairment         0 23    
ALLL for loans and leases collectively evaluated for impairment         3,302 3,104    
Total allowance for loan and lease losses 3,534 1,777 3,127 1,855 3,302 3,127 1,755 1,855
Non-PCI Loans | Noncommercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 1,513 1,575 1,596 1,485        
Provision for Loan, Lease, and Other Losses (10) 78 (93) 165        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 3        
Ending balance 1,503 1,653 1,503 1,653        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         3,701 2,613    
Loans and leases collectively evaluated for impairment         214,532 228,787    
Net loans and leases         218,233 231,400    
ALLL for loans and leases individually evaluated for impairment         86 109    
ALLL for loans and leases collectively evaluated for impairment         1,417 1,487    
Total allowance for loan and lease losses 1,513 1,575 1,596 1,485 1,503 1,596 1,653 1,485
Non-PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 15,835 14,727 14,447 14,105        
Provision for Loan, Lease, and Other Losses 155 1,487 1,506 2,262        
Charge-offs (222) (179) (472) (352)        
Recoveries 75 41 362 61        
Ending balance 15,843 16,076 15,843 16,076        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         39,337 31,476    
Loans and leases collectively evaluated for impairment         3,266,024 2,857,648    
Net loans and leases         3,305,361 2,889,124    
ALLL for loans and leases individually evaluated for impairment         2,687 2,447    
ALLL for loans and leases collectively evaluated for impairment         13,156 12,000    
Total allowance for loan and lease losses 15,835 14,727 14,447 14,105 15,843 14,447 16,076 14,105
Non-PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 21,290 16,125 21,013 15,971        
Provision for Loan, Lease, and Other Losses 1,054 1,470 1,604 2,628        
Charge-offs (280) (1,081) (1,105) (2,116)        
Recoveries 401 214 953 245        
Ending balance 22,465 16,728 22,465 16,728        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         8,804 7,613    
Loans and leases collectively evaluated for impairment         2,669,882 2,593,731    
Net loans and leases         2,678,686 2,601,344    
ALLL for loans and leases individually evaluated for impairment         1,086 366    
ALLL for loans and leases collectively evaluated for impairment         21,379 20,647    
Total allowance for loan and lease losses 21,290 16,125 21,013 15,971 22,465 21,013 16,728 15,971
Non-PCI Loans | Noncommercial | Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 27,129 19,373 28,287 19,496        
Provision for Loan, Lease, and Other Losses 4,569 2,299 6,359 4,293        
Charge-offs (4,991) (3,136) (9,019) (6,243)        
Recoveries 1,093 1,111 2,173 2,101        
Ending balance 27,800 19,647 27,800 19,647        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         2,273 1,912    
Loans and leases collectively evaluated for impairment         1,473,137 1,444,226    
Net loans and leases         1,475,410 1,446,138    
ALLL for loans and leases individually evaluated for impairment         632 667    
ALLL for loans and leases collectively evaluated for impairment         27,168 27,620    
Total allowance for loan and lease losses 27,129 19,373 28,287 19,496 27,800 28,287 19,647 19,496
PCI Loans                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 10,924 13,757 13,769 16,312        
Provision for Loan, Lease, and Other Losses 2,572 (2,146) (273) (4,143)        
Charge-offs 0 (56) 0 (614)        
Recoveries 0 0 0 0        
Ending balance 13,496 11,555 13,496 11,555        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 10,924 13,757 13,769 16,312 13,496 13,769 11,555 16,312
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         894,863 809,169    
PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 297 733 483 1,082        
Provision for Loan, Lease, and Other Losses 280 (453) 94 (802)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 577 280 577 280        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 297 733 483 1,082 577 483 280 1,082
PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 5,193 6,750 6,423 7,838        
Provision for Loan, Lease, and Other Losses 1,604 (935) 374 (1,914)        
Charge-offs 0 (56) 0 (165)        
Recoveries 0 0 0 0        
Ending balance 6,797 5,759 6,797 5,759        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 5,193 6,750 6,423 7,838 6,797 6,423 5,759 7,838
PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 344 770 502 773        
Provision for Loan, Lease, and Other Losses 10 (154) (148) (152)        
Charge-offs 0 0 0 (5)        
Recoveries 0 0 0 0        
Ending balance 354 616 354 616        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 344 770 502 773 354 502 616 773
PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 362 225 504 445        
Provision for Loan, Lease, and Other Losses 94 60 (48) (160)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 456 285 456 285        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 362 225 504 445 456 504 285 445
PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 4,273 4,680 4,818 5,398        
Provision for Loan, Lease, and Other Losses 556 (382) 11 (729)        
Charge-offs 0 0 0 (371)        
Recoveries 0 0 0 0        
Ending balance 4,829 4,298 4,829 4,298        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 4,273 4,680 4,818 5,398 4,829 4,818 4,298 5,398
PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 406 415 956 523        
Provision for Loan, Lease, and Other Losses 5 (177) (545) (285)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 411 238 411 238        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 406 415 956 523 411 956 238 523
PCI Loans | Noncommercial | Consumer and Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 49 184 83 253        
Provision for Loan, Lease, and Other Losses 23 (105) (11) (101)        
Charge-offs 0 0 0 (73)        
Recoveries 0 0 0 0        
Ending balance 72 79 72 79        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses $ 49 $ 184 $ 83 $ 253 72 83 $ 79 $ 253
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         $ 2,722 $ 3,474