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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Net loans and leases         $ 21,085,030 $ 20,033,774    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         868,200 950,516 $ 1,044,064 $ 1,186,498
Allowance for loan and lease losses         211,950 206,216    
Commercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         543,705 593,614    
Commercial | Construction and land development                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         23,138 33,880    
Commercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         491,180 525,468    
Commercial | Other commercial real estate                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         14,783 17,076    
Commercial | Commercial and industrial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         11,437 15,182    
Commercial | Other                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         3,167 2,008    
Noncommercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         324,495 356,902    
Noncommercial | Construction and land development                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         83 0    
Noncommercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         278,872 302,158    
Noncommercial | Revolving mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         43,509 52,471    
Noncommercial | Consumer                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         2,031 2,273    
Non-PCI Loans                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance         8,372 7,200    
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance $ 196,453 $ 192,849 $ 189,904 $ 182,837        
Provision for Loan, Lease, and Other Losses 7,430 (2,662) 20,978 14,988        
Charge-offs (6,210) (5,018) (17,953) (17,098)        
Recoveries 2,645 2,737 7,389 7,179        
Ending balance 200,318 187,906 200,318 187,906        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         136,000 150,367    
Loans and leases collectively evaluated for impairment         20,292,780 19,139,107    
Net loans and leases         20,428,780 19,289,474    
ALLL for loans and leases individually evaluated for impairment         8,372 7,200    
ALLL for loans and leases collectively evaluated for impairment         191,946 182,704    
Total allowance for loan and lease losses 196,453 192,849 189,904 182,837 200,318 189,904 187,906 182,837
Non-PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 17,169 13,079 16,288 11,961        
Provision for Loan, Lease, and Other Losses 835 1,189 2,069 2,380        
Charge-offs (77) (336) (639) (575)        
Recoveries 69 129 278 295        
Ending balance 17,996 14,061 17,996 14,061        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         3,304 3,094    
Loans and leases collectively evaluated for impairment         638,854 617,258    
Net loans and leases         642,158 620,352    
ALLL for loans and leases individually evaluated for impairment         239 123    
ALLL for loans and leases collectively evaluated for impairment         17,757 16,165    
Total allowance for loan and lease losses 17,169 13,079 16,288 11,961 17,996 16,288 14,061 11,961
Non-PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 71,613 80,436 69,896 85,189        
Provision for Loan, Lease, and Other Losses (2,163) (5,664) (1,067) (11,221)        
Charge-offs (461) (411) (454) (691)        
Recoveries 378 794 992 1,878        
Ending balance 69,367 75,155 69,367 75,155        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         79,833 95,107    
Loans and leases collectively evaluated for impairment         8,699,299 8,179,441    
Net loans and leases         8,779,132 8,274,548    
ALLL for loans and leases individually evaluated for impairment         3,126 3,370    
ALLL for loans and leases collectively evaluated for impairment         66,241 66,526    
Total allowance for loan and lease losses 71,613 80,436 69,896 85,189 69,367 69,896 75,155 85,189
Non-PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 2,138 804 2,168 732        
Provision for Loan, Lease, and Other Losses 150 291 (34) 522        
Charge-offs 0 0 0 (178)        
Recoveries 13 15 167 34        
Ending balance 2,301 1,110 2,301 1,110        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,601 427    
Loans and leases collectively evaluated for impairment         344,429 320,594    
Net loans and leases         346,030 321,021    
ALLL for loans and leases individually evaluated for impairment         118 289    
ALLL for loans and leases collectively evaluated for impairment         2,183 1,879    
Total allowance for loan and lease losses 2,138 804 2,168 732 2,301 2,168 1,110 732
Non-PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 43,908 39,392 43,116 30,727        
Provision for Loan, Lease, and Other Losses 2,954 (799) 5,236 11,294        
Charge-offs (1,198) (784) (3,690) (4,815)        
Recoveries 328 296 1,330 899        
Ending balance 45,992 38,105 45,992 38,105        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         10,672 17,910    
Loans and leases collectively evaluated for impairment         2,496,495 2,351,048    
Net loans and leases         2,507,167 2,368,958    
ALLL for loans and leases individually evaluated for impairment         1,059 1,118    
ALLL for loans and leases collectively evaluated for impairment         44,933 41,998    
Total allowance for loan and lease losses 43,908 39,392 43,116 30,727 45,992 43,116 38,105 30,727
Non-PCI Loans | Commercial | Lease financing                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 5,766 4,706 5,524 4,286        
Provision for Loan, Lease, and Other Losses 274 424 337 843        
Charge-offs (132) (7) (93) (28)        
Recoveries 5 16 145 38        
Ending balance 5,913 5,139 5,913 5,139        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,146 1,755    
Loans and leases collectively evaluated for impairment         802,455 729,023    
Net loans and leases         803,601 730,778    
ALLL for loans and leases individually evaluated for impairment         45 213    
ALLL for loans and leases collectively evaluated for impairment         5,868 5,311    
Total allowance for loan and lease losses 5,766 4,706 5,524 4,286 5,913 5,524 5,139 4,286
Non-PCI Loans | Commercial | Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 1,755 1,188 1,855 3,184        
Provision for Loan, Lease, and Other Losses 183 (58) (109) (2,100)        
Charge-offs 0 0 (22) 0        
Recoveries 170 45 384 91        
Ending balance 2,108 1,175 2,108 1,175        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         443 1,183    
Loans and leases collectively evaluated for impairment         325,905 313,649    
Net loans and leases         326,348 314,832    
ALLL for loans and leases individually evaluated for impairment         22 0    
ALLL for loans and leases collectively evaluated for impairment         2,086 1,855    
Total allowance for loan and lease losses 1,755 1,188 1,855 3,184 2,108 1,855 1,175 3,184
Non-PCI Loans | Noncommercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 1,653 1,133 1,485 892        
Provision for Loan, Lease, and Other Losses 88 114 253 306        
Charge-offs 0 0 0 (22)        
Recoveries 0 3 3 74        
Ending balance 1,741 1,250 1,741 1,250        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         406 784    
Loans and leases collectively evaluated for impairment         233,977 219,289    
Net loans and leases         234,383 220,073    
ALLL for loans and leases individually evaluated for impairment         0 49    
ALLL for loans and leases collectively evaluated for impairment         1,741 1,436    
Total allowance for loan and lease losses 1,653 1,133 1,485 892 1,741 1,485 1,250 892
Non-PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 16,076 12,705 14,105 10,661        
Provision for Loan, Lease, and Other Losses 531 520 2,794 2,495        
Charge-offs (328) (394) (680) (768)        
Recoveries 334 314 394 757        
Ending balance 16,613 13,145 16,613 13,145        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         29,327 22,986    
Loans and leases collectively evaluated for impairment         2,784,587 2,672,999    
Net loans and leases         2,813,914 2,695,985    
ALLL for loans and leases individually evaluated for impairment         2,077 1,212    
ALLL for loans and leases collectively evaluated for impairment         14,536 12,893    
Total allowance for loan and lease losses 16,076 12,705 14,105 10,661 16,613 14,105 13,145 10,661
Non-PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 16,728 17,290 15,971 18,650        
Provision for Loan, Lease, and Other Losses 679 871 3,306 440        
Charge-offs (391) (677) (2,507) (2,086)        
Recoveries 256 363 502 843        
Ending balance 17,272 17,847 17,272 17,847        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         7,708 5,883    
Loans and leases collectively evaluated for impairment         2,565,378 2,517,223    
Net loans and leases         2,573,086 2,523,106    
ALLL for loans and leases individually evaluated for impairment         1,046 299    
ALLL for loans and leases collectively evaluated for impairment         16,226 15,672    
Total allowance for loan and lease losses 16,728 17,290 15,971 18,650 17,272 15,971 17,847 18,650
Non-PCI Loans | Noncommercial | Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 19,647 22,116 19,496 16,555        
Provision for Loan, Lease, and Other Losses 3,899 450 8,193 10,029        
Charge-offs (3,623) (2,409) (9,868) (7,935)        
Recoveries 1,092 762 3,194 2,270        
Ending balance 21,015 20,919 21,015 20,919        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,560 1,238    
Loans and leases collectively evaluated for impairment         1,401,401 1,218,583    
Net loans and leases         1,402,961 1,219,821    
ALLL for loans and leases individually evaluated for impairment         640 527    
ALLL for loans and leases collectively evaluated for impairment         20,375 18,969    
Total allowance for loan and lease losses 19,647 22,116 19,496 16,555 21,015 19,496 20,919 16,555
PCI Loans                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 11,555 15,468 16,312 21,629        
Provision for Loan, Lease, and Other Losses 77 2,769 (4,066) (1,370)        
Charge-offs 0 (680) (614) (2,702)        
Recoveries 0 0 0 0        
Ending balance 11,632 17,557 11,632 17,557        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 11,555 15,468 16,312 21,629 11,632 16,312 17,557 21,629
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         868,200 950,516    
PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 280 569 1,082 150        
Provision for Loan, Lease, and Other Losses 74 632 (728) 1,148        
Charge-offs 0 0 0 (97)        
Recoveries 0 0 0 0        
Ending balance 354 1,201 354 1,201        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 280 569 1,082 150 354 1,082 1,201 150
PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 5,759 6,428 7,838 10,135        
Provision for Loan, Lease, and Other Losses 406 2,187 (1,508) (803)        
Charge-offs 0 (48) (165) (765)        
Recoveries 0 0 0 0        
Ending balance 6,165 8,567 6,165 8,567        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 5,759 6,428 7,838 10,135 6,165 7,838 8,567 10,135
PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 616 69 773 75        
Provision for Loan, Lease, and Other Losses (378) 235 (530) 229        
Charge-offs 0 0 (5) 0        
Recoveries 0 0 0 0        
Ending balance 238 304 238 304        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 616 69 773 75 238 773 304 75
PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 285 323 445 1,240        
Provision for Loan, Lease, and Other Losses 101 118 (59) (514)        
Charge-offs 0 (39) 0 (324)        
Recoveries 0 0 0 0        
Ending balance 386 402 386 402        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 285 323 445 1,240 386 445 402 1,240
PCI Loans | Noncommercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 0 0 0 183        
Provision for Loan, Lease, and Other Losses 0 0 0 (183)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 0 0 0 0        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 0 0 0 183 0 0 0 183
PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 4,298 5,842 5,398 5,820        
Provision for Loan, Lease, and Other Losses (134) (281) (863) 21        
Charge-offs 0 (15) (371) (295)        
Recoveries 0 0 0 0        
Ending balance 4,164 5,546 4,164 5,546        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 4,298 5,842 5,398 5,820 4,164 5,398 5,546 5,820
PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 238 2,051 523 3,999        
Provision for Loan, Lease, and Other Losses (21) (151) (306) (1,918)        
Charge-offs 0 (577) 0 (758)        
Recoveries 0 0 0 0        
Ending balance 217 1,323 217 1,323        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 238 2,051 523 3,999 217 523 1,323 3,999
PCI Loans | Noncommercial | Consumer and Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 79 186 253 27        
Provision for Loan, Lease, and Other Losses 29 29 (72) 650        
Charge-offs 0 (1) (73) (463)        
Recoveries 0 0 0 0        
Ending balance 108 214 108 214        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses $ 79 $ 186 $ 253 $ 27 108 253 $ 214 $ 27
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         $ 5,198 $ 4,281