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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Net loans and leases         $ 22,917,231 $ 21,519,083    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         834,167 809,169 $ 868,200 $ 950,516
Allowance for loan and lease losses         231,842 218,795    
Commercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         436,720 499,970    
Commercial | Construction and land development                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         17,406 20,766    
Commercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         393,557 453,013    
Commercial | Other commercial real estate                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         17,771 12,645    
Commercial | Commercial and industrial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         7,064 11,844    
Commercial | Other                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         922 1,702    
Noncommercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         397,447 309,199    
Noncommercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         327,263 268,777    
Noncommercial | Revolving mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         67,847 38,650    
Noncommercial | Consumer                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         2,337 1,772    
Non-PCI Loans                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance         10,132 9,210    
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance $ 215,302 $ 196,453 $ 205,026 $ 189,904        
Provision for Loan, Lease, and Other Losses 8,483 7,430 29,311 20,978        
Charge-offs (8,494) (6,210) (26,688) (17,953)        
Recoveries 3,592 2,645 11,234 7,389        
Ending balance 218,883 200,318 218,883 200,318        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         143,042 136,399    
Loans and leases collectively evaluated for impairment         22,171,864 20,792,310    
Net loans and leases         22,314,906 20,928,709    
ALLL for loans and leases individually evaluated for impairment         10,132 9,210    
ALLL for loans and leases collectively evaluated for impairment         208,751 195,816    
Total allowance for loan and lease losses 215,302 196,453 205,026 189,904 218,883 205,026 200,318 189,904
Non-PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 33,559 17,169 28,877 16,288        
Provision for Loan, Lease, and Other Losses (5,150) 835 (242) 2,069        
Charge-offs (9) (77) (499) (639)        
Recoveries 56 69 320 278        
Ending balance 28,456 17,996 28,456 17,996        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         543 1,045    
Loans and leases collectively evaluated for impairment         626,344 648,112    
Net loans and leases         626,887 649,157    
ALLL for loans and leases individually evaluated for impairment         91 151    
ALLL for loans and leases collectively evaluated for impairment         28,365 28,726    
Total allowance for loan and lease losses 33,559 17,169 28,877 16,288 28,456 28,877 17,996 16,288
Non-PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 49,746 71,613 48,278 69,896        
Provision for Loan, Lease, and Other Losses (71) (2,163) 574 (1,067)        
Charge-offs (39) (461) (311) (454)        
Recoveries 1,446 378 2,541 992        
Ending balance 51,082 69,367 51,082 69,367        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         71,952 76,361    
Loans and leases collectively evaluated for impairment         9,438,206 8,949,859    
Net loans and leases         9,510,158 9,026,220    
ALLL for loans and leases individually evaluated for impairment         3,916 3,488    
ALLL for loans and leases collectively evaluated for impairment         47,166 44,790    
Total allowance for loan and lease losses 49,746 71,613 48,278 69,896 51,082 48,278 69,367 69,896
Non-PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 3,612 2,138 3,269 2,168        
Provision for Loan, Lease, and Other Losses 891 150 1,228 (34)        
Charge-offs 0 0 (5) 0        
Recoveries 8 13 19 167        
Ending balance 4,511 2,301 4,511 2,301        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,616 1,563    
Loans and leases collectively evaluated for impairment         433,120 349,728    
Net loans and leases         434,736 351,291    
ALLL for loans and leases individually evaluated for impairment         204 152    
ALLL for loans and leases collectively evaluated for impairment         4,307 3,117    
Total allowance for loan and lease losses 3,612 2,138 3,269 2,168 4,511 3,269 2,301 2,168
Non-PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 51,068 43,908 50,225 43,116        
Provision for Loan, Lease, and Other Losses 5,621 2,954 10,181 5,236        
Charge-offs (1,275) (1,198) (7,649) (3,690)        
Recoveries 433 328 3,090 1,330        
Ending balance 55,847 45,992 55,847 45,992        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         9,878 12,600    
Loans and leases collectively evaluated for impairment         2,645,020 2,554,901    
Net loans and leases         2,654,898 2,567,501    
ALLL for loans and leases individually evaluated for impairment         1,260 1,732    
ALLL for loans and leases collectively evaluated for impairment         54,587 48,493    
Total allowance for loan and lease losses 51,068 43,908 50,225 43,116 55,847 50,225 45,992 43,116
Non-PCI Loans | Commercial | Lease financing                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 6,404 5,766 5,907 5,524        
Provision for Loan, Lease, and Other Losses 884 274 1,645 337        
Charge-offs (687) (132) (957) (93)        
Recoveries 3 5 9 145        
Ending balance 6,604 5,913 6,604 5,913        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,688 1,074    
Loans and leases collectively evaluated for impairment         865,116 825,196    
Net loans and leases         866,804 826,270    
ALLL for loans and leases individually evaluated for impairment         223 75    
ALLL for loans and leases collectively evaluated for impairment         6,381 5,832    
Total allowance for loan and lease losses 6,404 5,766 5,907 5,524 6,604 5,907 5,913 5,524
Non-PCI Loans | Commercial | Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 3,302 1,755 3,127 1,855        
Provision for Loan, Lease, and Other Losses 58 183 299 (109)        
Charge-offs (666) 0 (853) (22)        
Recoveries 123 170 244 384        
Ending balance 2,817 2,108 2,817 2,108        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         522 142    
Loans and leases collectively evaluated for impairment         321,694 340,122    
Net loans and leases         322,216 340,264    
ALLL for loans and leases individually evaluated for impairment         0 23    
ALLL for loans and leases collectively evaluated for impairment         2,817 3,104    
Total allowance for loan and lease losses 3,302 1,755 3,127 1,855 2,817 3,127 2,108 1,855
Non-PCI Loans | Noncommercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 1,503 1,653 1,596 1,485        
Provision for Loan, Lease, and Other Losses 92 88 (1) 253        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 3        
Ending balance 1,595 1,741 1,595 1,741        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         3,660 2,613    
Loans and leases collectively evaluated for impairment         223,524 228,787    
Net loans and leases         227,184 231,400    
ALLL for loans and leases individually evaluated for impairment         94 109    
ALLL for loans and leases collectively evaluated for impairment         1,501 1,487    
Total allowance for loan and lease losses 1,503 1,653 1,596 1,485 1,595 1,596 1,741 1,485
Non-PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 15,843 16,076 14,447 14,105        
Provision for Loan, Lease, and Other Losses 531 531 2,037 2,794        
Charge-offs (604) (328) (1,076) (680)        
Recoveries 92 334 454 394        
Ending balance 15,862 16,613 15,862 16,613        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         32,127 31,476    
Loans and leases collectively evaluated for impairment         3,435,851 2,857,648    
Net loans and leases         3,467,978 2,889,124    
ALLL for loans and leases individually evaluated for impairment         1,907 2,447    
ALLL for loans and leases collectively evaluated for impairment         13,955 12,000    
Total allowance for loan and lease losses 15,843 16,076 14,447 14,105 15,862 14,447 16,613 14,105
Non-PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 22,465 16,728 21,013 15,971        
Provision for Loan, Lease, and Other Losses 842 679 2,446 3,306        
Charge-offs (218) (391) (1,323) (2,507)        
Recoveries 228 256 1,181 502        
Ending balance 23,317 17,272 23,317 17,272        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         18,830 7,613    
Loans and leases collectively evaluated for impairment         2,673,728 2,593,731    
Net loans and leases         2,692,558 2,601,344    
ALLL for loans and leases individually evaluated for impairment         1,784 366    
ALLL for loans and leases collectively evaluated for impairment         21,533 20,647    
Total allowance for loan and lease losses 22,465 16,728 21,013 15,971 23,317 21,013 17,272 15,971
Non-PCI Loans | Noncommercial | Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 27,800 19,647 28,287 19,496        
Provision for Loan, Lease, and Other Losses 4,785 3,899 11,144 8,193        
Charge-offs (4,996) (3,623) (14,015) (9,868)        
Recoveries 1,203 1,092 3,376 3,194        
Ending balance 28,792 21,015 28,792 21,015        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         2,226 1,912    
Loans and leases collectively evaluated for impairment         1,509,261 1,444,226    
Net loans and leases         1,511,487 1,446,138    
ALLL for loans and leases individually evaluated for impairment         653 667    
ALLL for loans and leases collectively evaluated for impairment         28,139 27,620    
Total allowance for loan and lease losses 27,800 19,647 28,287 19,496 28,792 28,287 21,015 19,496
PCI Loans                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 13,496 11,555 13,769 16,312        
Provision for Loan, Lease, and Other Losses (537) 77 (810) (4,066)        
Charge-offs 0 0 0 (614)        
Recoveries 0 0 0 0        
Ending balance 12,959 11,632 12,959 11,632        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 13,496 11,555 13,769 16,312 12,959 13,769 11,632 16,312
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         834,167 809,169    
PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 577 280 483 1,082        
Provision for Loan, Lease, and Other Losses (78) 74 16 (728)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 499 354 499 354        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 577 280 483 1,082 499 483 354 1,082
PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 6,797 5,759 6,423 7,838        
Provision for Loan, Lease, and Other Losses (15) 406 359 (1,508)        
Charge-offs 0 0 0 (165)        
Recoveries 0 0 0 0        
Ending balance 6,782 6,165 6,782 6,165        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 6,797 5,759 6,423 7,838 6,782 6,423 6,165 7,838
PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 354 616 502 773        
Provision for Loan, Lease, and Other Losses (146) (378) (294) (530)        
Charge-offs 0 0 0 (5)        
Recoveries 0 0 0 0        
Ending balance 208 238 208 238        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 354 616 502 773 208 502 238 773
PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 456 285 504 445        
Provision for Loan, Lease, and Other Losses (133) 101 (181) (59)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 323 386 323 386        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 456 285 504 445 323 504 386 445
PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 4,829 4,298 4,818 5,398        
Provision for Loan, Lease, and Other Losses (184) (134) (173) (863)        
Charge-offs 0 0 0 (371)        
Recoveries 0 0 0 0        
Ending balance 4,645 4,164 4,645 4,164        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 4,829 4,298 4,818 5,398 4,645 4,818 4,164 5,398
PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 411 238 956 523        
Provision for Loan, Lease, and Other Losses (34) (21) (579) (306)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 377 217 377 217        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 411 238 956 523 377 956 217 523
PCI Loans | Noncommercial | Consumer and Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 72 79 83 253        
Provision for Loan, Lease, and Other Losses 53 29 42 (72)        
Charge-offs 0 0 0 (73)        
Recoveries 0 0 0 0        
Ending balance 125 108 125 108        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses $ 72 $ 79 $ 83 $ 253 125 83 $ 108 $ 253
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         $ 3,259 $ 3,474