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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
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Net loans and leases     $ 21,685,506 $ 21,519,083    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     848,816 809,169 $ 945,887 $ 950,516
Allowance for loan and lease losses     220,943 218,795    
Commercial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     529,854 499,970    
Commercial | Construction and land development            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     26,542 20,766    
Commercial | Mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     455,551 453,013    
Commercial | Other commercial real estate            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     18,723 12,645    
Commercial | Commercial and industrial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     27,794 11,844    
Commercial | Other            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     1,244 1,702    
Noncommercial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     318,962 309,199    
Noncommercial | Mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     275,904 268,777    
Noncommercial | Revolving mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     40,345 38,650    
Noncommercial | Consumer            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     2,713 1,772    
Non-PCI Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Impaired Financing Receivable, Related Allowance     8,852 9,210    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 205,026 $ 189,904        
Provision for Loan, Lease, and Other Losses 11,076 6,840        
Charge-offs (8,709) (6,222)        
Recoveries 2,626 2,504        
Ending balance 210,019 193,026        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     137,711 136,399    
Loans and leases collectively evaluated for impairment     20,919,922 20,792,310    
Net loans and leases     21,057,633 20,928,709    
ALLL for loans and leases individually evaluated for impairment     8,852 9,210    
ALLL for loans and leases collectively evaluated for impairment     201,167 195,816    
Total allowance for loan and lease losses 205,026 189,904 210,019 205,026 193,026 189,904
Non-PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 28,877 16,288        
Provision for Loan, Lease, and Other Losses 2,536 943        
Charge-offs (77) (426)        
Recoveries 55 80        
Ending balance 31,391 16,885        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,058 1,045    
Loans and leases collectively evaluated for impairment     682,357 648,112    
Net loans and leases     683,415 649,157    
ALLL for loans and leases individually evaluated for impairment     151 151    
ALLL for loans and leases collectively evaluated for impairment     31,240 28,726    
Total allowance for loan and lease losses 28,877 16,288 31,391 28,877 16,885 16,288
Non-PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 48,278 69,896        
Provision for Loan, Lease, and Other Losses 6 394        
Charge-offs (37) (90)        
Recoveries 364 256        
Ending balance 48,611 70,456        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     74,788 76,361    
Loans and leases collectively evaluated for impairment     9,098,824 8,949,859    
Net loans and leases     9,173,612 9,026,220    
ALLL for loans and leases individually evaluated for impairment     3,122 3,488    
ALLL for loans and leases collectively evaluated for impairment     45,489 44,790    
Total allowance for loan and lease losses 48,278 69,896 48,611 48,278 70,456 69,896
Non-PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 3,269 2,168        
Provision for Loan, Lease, and Other Losses 304 (104)        
Charge-offs (5) 0        
Recoveries 4 143        
Ending balance 3,572 2,207        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,497 1,563    
Loans and leases collectively evaluated for impairment     363,365 349,728    
Net loans and leases     364,862 351,291    
ALLL for loans and leases individually evaluated for impairment     132 152    
ALLL for loans and leases collectively evaluated for impairment     3,440 3,117    
Total allowance for loan and lease losses 3,269 2,168 3,572 3,269 2,207 2,168
Non-PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 50,225 43,116        
Provision for Loan, Lease, and Other Losses 3,592 2,201        
Charge-offs (3,253) (1,317)        
Recoveries 265 479        
Ending balance 50,829 44,479        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     10,864 12,600    
Loans and leases collectively evaluated for impairment     2,467,047 2,554,901    
Net loans and leases     2,477,911 2,567,501    
ALLL for loans and leases individually evaluated for impairment     1,043 1,732    
ALLL for loans and leases collectively evaluated for impairment     49,786 48,493    
Total allowance for loan and lease losses 50,225 43,116 50,829 50,225 44,479 43,116
Non-PCI Loans | Commercial | Lease financing            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 5,907 5,524        
Provision for Loan, Lease, and Other Losses 575 (282)        
Charge-offs (173) 0        
Recoveries 6 180        
Ending balance 6,315 5,422        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     2,054 1,074    
Loans and leases collectively evaluated for impairment     838,147 825,196    
Net loans and leases     840,201 826,270    
ALLL for loans and leases individually evaluated for impairment     213 75    
ALLL for loans and leases collectively evaluated for impairment     6,102 5,832    
Total allowance for loan and lease losses 5,907 5,524 6,315 5,907 5,422 5,524
Non-PCI Loans | Commercial | Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 3,127 1,855        
Provision for Loan, Lease, and Other Losses 517 (328)        
Charge-offs (123) (71)        
Recoveries 13 321        
Ending balance 3,534 1,777        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     259 142    
Loans and leases collectively evaluated for impairment     321,093 340,122    
Net loans and leases     321,352 340,264    
ALLL for loans and leases individually evaluated for impairment     21 23    
ALLL for loans and leases collectively evaluated for impairment     3,513 3,104    
Total allowance for loan and lease losses 3,127 1,855 3,534 3,127 1,777 1,855
Non-PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,596 1,485        
Provision for Loan, Lease, and Other Losses (83) 87        
Charge-offs 0 0        
Recoveries 0 3        
Ending balance 1,513 1,575        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     2,577 2,613    
Loans and leases collectively evaluated for impairment     215,526 228,787    
Net loans and leases     218,103 231,400    
ALLL for loans and leases individually evaluated for impairment     103 109    
ALLL for loans and leases collectively evaluated for impairment     1,410 1,487    
Total allowance for loan and lease losses 1,596 1,485 1,513 1,596 1,575 1,485
Non-PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 23,094 14,105        
Provision for Loan, Lease, and Other Losses 1,061 776        
Charge-offs (250) (174)        
Recoveries 287 20        
Ending balance 24,192 14,727        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     34,484 31,476    
Loans and leases collectively evaluated for impairment     2,910,877 2,857,648    
Net loans and leases     2,945,361 2,889,124    
ALLL for loans and leases individually evaluated for impairment     3,189 2,447    
ALLL for loans and leases collectively evaluated for impairment     21,003 20,647    
Total allowance for loan and lease losses 23,094 14,105 24,192 23,094 14,727 14,105
Non-PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 12,366 15,971        
Provision for Loan, Lease, and Other Losses 840 1,158        
Charge-offs (825) (1,036)        
Recoveries 552 32        
Ending balance 12,933 16,125        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     8,272 7,613    
Loans and leases collectively evaluated for impairment     2,595,884 2,593,731    
Net loans and leases     2,604,156 2,601,344    
ALLL for loans and leases individually evaluated for impairment     287 366    
ALLL for loans and leases collectively evaluated for impairment     12,646 12,000    
Total allowance for loan and lease losses 12,366 15,971 12,933 12,366 16,125 15,971
Non-PCI Loans | Noncommercial | Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 28,287 19,496        
Provision for Loan, Lease, and Other Losses 1,728 1,995        
Charge-offs (3,966) (3,108)        
Recoveries 1,080 990        
Ending balance 27,129 19,373        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,858 1,912    
Loans and leases collectively evaluated for impairment     1,426,802 1,444,226    
Net loans and leases     1,428,660 1,446,138    
ALLL for loans and leases individually evaluated for impairment     591 667    
ALLL for loans and leases collectively evaluated for impairment     26,538 27,620    
Total allowance for loan and lease losses 28,287 19,496 27,129 28,287 19,373 19,496
PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 13,769 16,312        
Provision for Loan, Lease, and Other Losses (2,845) (1,997)        
Charge-offs 0 (558)        
Recoveries 0 0        
Ending balance 10,924 13,757        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 13,769 16,312 10,924 13,769 13,757 16,312
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     848,816 809,169    
PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 483 1,082        
Provision for Loan, Lease, and Other Losses (186) (349)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 297 733        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 483 1,082 297 483 733 1,082
PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 6,423 7,838        
Provision for Loan, Lease, and Other Losses (1,230) (980)        
Charge-offs 0 (108)        
Recoveries 0 0        
Ending balance 5,193 6,750        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 6,423 7,838 5,193 6,423 6,750 7,838
PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 502 773        
Provision for Loan, Lease, and Other Losses (158) 2        
Charge-offs 0 (5)        
Recoveries 0 0        
Ending balance 344 770        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 502 773 344 502 770 773
PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 504 445        
Provision for Loan, Lease, and Other Losses (142) (220)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 362 225        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 504 445 362 504 225 445
PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 4,818 5,398        
Provision for Loan, Lease, and Other Losses (545) (347)        
Charge-offs 0 (371)        
Recoveries 0 0        
Ending balance 4,273 4,680        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 4,818 5,398 4,273 4,818 4,680 5,398
PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 956 523        
Provision for Loan, Lease, and Other Losses (550) (108)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 406 415        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 956 523 406 956 415 523
PCI Loans | Noncommercial | Consumer and Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 83 253        
Provision for Loan, Lease, and Other Losses (34) 5        
Charge-offs 0 (74)        
Recoveries 0 0        
Ending balance 49 184        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses $ 83 $ 253 49 83 $ 184 $ 253
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     $ 3,957 $ 3,474