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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, 2016
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Net loans and leases     $ 20,210,906 $ 20,033,774    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     945,887 950,516 $ 1,252,545 $ 1,186,498
Allowance for loan and lease losses     206,783 206,216    
Commercial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     594,227 593,614    
Commercial | Construction and land development            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     32,799 33,880    
Commercial | Mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     526,776 525,468    
Commercial | Other commercial real estate            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     18,050 17,076    
Commercial | Commercial and industrial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     14,742 15,182    
Commercial | Other            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     1,860 2,008    
Noncommercial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     351,660 356,902    
Noncommercial | Mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     298,662 302,158    
Noncommercial | Revolving mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     50,574 52,471    
Noncommercial | Consumer            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     2,424 2,273    
Non-PCI Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Impaired Financing Receivable, Related Allowance     6,776 7,200    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 189,904 $ 182,837        
Provision for Loan, Lease, and Other Losses 6,840 8,656        
Charge-offs (6,222) (6,030)        
Recoveries 2,504 2,471        
Ending balance 193,026 187,934        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     140,680 150,367    
Loans and leases collectively evaluated for impairment     19,331,122 19,139,107    
Net loans and leases     19,471,802 19,289,474    
ALLL for loans and leases individually evaluated for impairment     6,776 7,200    
ALLL for loans and leases collectively evaluated for impairment     186,250 182,704    
Total allowance for loan and lease losses 189,904 182,837 193,026 189,904 187,934 182,837
Non-PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 16,288 11,961        
Provision for Loan, Lease, and Other Losses 943 1,103        
Charge-offs (426) (18)        
Recoveries 80 62        
Ending balance 16,885 13,108        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     3,247 3,094    
Loans and leases collectively evaluated for impairment     623,064 617,258    
Net loans and leases     626,311 620,352    
ALLL for loans and leases individually evaluated for impairment     83 123    
ALLL for loans and leases collectively evaluated for impairment     16,802 16,165    
Total allowance for loan and lease losses 16,288 11,961 16,885 16,288 13,108 11,961
Non-PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 69,896 85,189        
Provision for Loan, Lease, and Other Losses 394 (3,679)        
Charge-offs (90) (233)        
Recoveries 256 761        
Ending balance 70,456 82,038        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     88,448 95,107    
Loans and leases collectively evaluated for impairment     8,265,183 8,179,441    
Net loans and leases     8,353,631 8,274,548    
ALLL for loans and leases individually evaluated for impairment     3,467 3,370    
ALLL for loans and leases collectively evaluated for impairment     66,989 66,526    
Total allowance for loan and lease losses 69,896 85,189 70,456 69,896 82,038 85,189
Non-PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 2,168 732        
Provision for Loan, Lease, and Other Losses (104) 458        
Charge-offs 0 (169)        
Recoveries 143 10        
Ending balance 2,207 1,031        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     418 427    
Loans and leases collectively evaluated for impairment     324,440 320,594    
Net loans and leases     324,858 321,021    
ALLL for loans and leases individually evaluated for impairment     282 289    
ALLL for loans and leases collectively evaluated for impairment     1,925 1,879    
Total allowance for loan and lease losses 2,168 732 2,207 2,168 1,031 732
Non-PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 43,116 30,727        
Provision for Loan, Lease, and Other Losses 2,201 7,546        
Charge-offs (1,317) (1,713)        
Recoveries 479 394        
Ending balance 44,479 36,954        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     13,720 17,910    
Loans and leases collectively evaluated for impairment     2,376,226 2,351,048    
Net loans and leases     2,389,946 2,368,958    
ALLL for loans and leases individually evaluated for impairment     650 1,118    
ALLL for loans and leases collectively evaluated for impairment     43,829 41,998    
Total allowance for loan and lease losses 43,116 30,727 44,479 43,116 36,954 30,727
Non-PCI Loans | Commercial | Lease financing            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 5,524 4,286        
Provision for Loan, Lease, and Other Losses (282) 11        
Charge-offs 0 (15)        
Recoveries 180 11        
Ending balance 5,422 4,293        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,528 1,755    
Loans and leases collectively evaluated for impairment     749,764 729,023    
Net loans and leases     751,292 730,778    
ALLL for loans and leases individually evaluated for impairment     191 213    
ALLL for loans and leases collectively evaluated for impairment     5,231 5,311    
Total allowance for loan and lease losses 5,524 4,286 5,422 5,524 4,293 4,286
Non-PCI Loans | Commercial | Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,855 3,184        
Provision for Loan, Lease, and Other Losses (328) (218)        
Charge-offs (71) 0        
Recoveries 321 15        
Ending balance 1,777 2,981        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     960 1,183    
Loans and leases collectively evaluated for impairment     342,917 313,649    
Net loans and leases     343,877 314,832    
ALLL for loans and leases individually evaluated for impairment     49 0    
ALLL for loans and leases collectively evaluated for impairment     1,728 1,855    
Total allowance for loan and lease losses 1,855 3,184 1,777 1,855 2,981 3,184
Non-PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,485 892        
Provision for Loan, Lease, and Other Losses 87 118        
Charge-offs 0 (22)        
Recoveries 3 68        
Ending balance 1,575 1,056        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     416 784    
Loans and leases collectively evaluated for impairment     212,816 219,289    
Net loans and leases     213,232 220,073    
ALLL for loans and leases individually evaluated for impairment     27 49    
ALLL for loans and leases collectively evaluated for impairment     1,548 1,436    
Total allowance for loan and lease losses 1,485 892 1,575 1,485 1,056 892
Non-PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 14,105 10,661        
Provision for Loan, Lease, and Other Losses 776 813        
Charge-offs (174) (284)        
Recoveries 20 138        
Ending balance 14,727 11,328        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     24,025 22,986    
Loans and leases collectively evaluated for impairment     2,694,183 2,672,999    
Net loans and leases     2,718,208 2,695,985    
ALLL for loans and leases individually evaluated for impairment     1,203 1,212    
ALLL for loans and leases collectively evaluated for impairment     13,524 12,893    
Total allowance for loan and lease losses 14,105 10,661 14,727 14,105 11,328 10,661
Non-PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 15,971 18,650        
Provision for Loan, Lease, and Other Losses 1,158 (462)        
Charge-offs (1,036) (793)        
Recoveries 32 134        
Ending balance 16,125 17,529        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     6,594 5,883    
Loans and leases collectively evaluated for impairment     2,515,308 2,517,223    
Net loans and leases     2,521,902 2,523,106    
ALLL for loans and leases individually evaluated for impairment     310 299    
ALLL for loans and leases collectively evaluated for impairment     15,815 15,672    
Total allowance for loan and lease losses 15,971 18,650 16,125 15,971 17,529 18,650
Non-PCI Loans | Noncommercial | Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 19,496 16,555        
Provision for Loan, Lease, and Other Losses 1,995 2,966        
Charge-offs (3,108) (2,783)        
Recoveries 990 878        
Ending balance 19,373 17,616        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,324 1,238    
Loans and leases collectively evaluated for impairment     1,227,221 1,218,583    
Net loans and leases     1,228,545 1,219,821    
ALLL for loans and leases individually evaluated for impairment     514 527    
ALLL for loans and leases collectively evaluated for impairment     18,859 18,969    
Total allowance for loan and lease losses 19,496 16,555 19,373 19,496 17,616 16,555
PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 16,312 21,629        
Provision for Loan, Lease, and Other Losses (1,997) (2,864)        
Charge-offs (558) (1,146)        
Recoveries 0 0        
Ending balance 13,757 17,619        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 16,312 21,629 13,757 16,312 17,619 21,629
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     945,887 950,516    
PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,082 150        
Provision for Loan, Lease, and Other Losses (349) 191        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 733 341        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 1,082 150 733 1,082 341 150
PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 7,838 10,135        
Provision for Loan, Lease, and Other Losses (980) (925)        
Charge-offs (108) (334)        
Recoveries 0 0        
Ending balance 6,750 8,876        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 7,838 10,135 6,750 7,838 8,876 10,135
PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 773 75        
Provision for Loan, Lease, and Other Losses 2 119        
Charge-offs (5) 0        
Recoveries 0 0        
Ending balance 770 194        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 773 75 770 773 194 75
PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 445 1,240        
Provision for Loan, Lease, and Other Losses (220) (1,031)        
Charge-offs 0 (198)        
Recoveries 0 0        
Ending balance 225 11        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 445 1,240 225 445 11 1,240
PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 0 183        
Provision for Loan, Lease, and Other Losses 0 (152)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 0 31        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 0 183 0 0 31 183
PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 5,398 5,820        
Provision for Loan, Lease, and Other Losses (347) (863)        
Charge-offs (371) (85)        
Recoveries 0 0        
Ending balance 4,680 4,872        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 5,398 5,820 4,680 5,398 4,872 5,820
PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 523 3,999        
Provision for Loan, Lease, and Other Losses (108) (655)        
Charge-offs 0 (73)        
Recoveries 0 0        
Ending balance 415 3,271        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 523 3,999 415 523 3,271 3,999
PCI Loans | Noncommercial | Consumer and Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 253 27        
Provision for Loan, Lease, and Other Losses 5 452        
Charge-offs (74) (456)        
Recoveries 0 0        
Ending balance 184 23        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses $ 253 $ 27 184 253 $ 23 $ 27
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     $ 4,284 $ 4,281