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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 206,216 $ 204,466 $ 233,394      
Provisions 32,941 20,664 640      
Charge-offs (30,201) (28,348) (37,770)      
Recoveries 9,839 9,434 8,202      
Net charge-offs (20,362) (18,914) (29,568)      
Ending balance 218,795 206,216 204,466      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 206,216 204,466 233,394 $ 218,795 $ 206,216 $ 204,466
Loans and Leases Evaluated for Impairment [Abstract]            
Net Loans and Leases       21,519,083 20,033,774  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
ALLL for loans and leases acquired with deteriorated credit quality       218,795 206,216  
PCI Loans       809,169 950,516 1,186,498
Commercial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       499,970 593,614  
Commercial | Construction and land development            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       20,766 33,880  
Commercial | Mortgage            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       453,013 525,468  
Commercial | Other commercial real estate            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       12,645 17,076  
Commercial | Commercial and industrial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       11,844 15,182  
Commercial | Other            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       1,702 2,008  
Commercial | Consumer and Other            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       1,702 2,008  
Noncommercial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       309,199 356,902  
Noncommercial | Consumer            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       1,772 2,273  
Non-PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 189,904 182,837 179,874      
Provisions 34,870 22,937 15,260      
Charge-offs (29,587) (25,304) (20,499)      
Recoveries 9,839 9,434 8,202      
Net charge-offs (19,748) (15,870) (12,297)      
Ending balance 205,026 189,904 182,837      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       9,210 7,200  
ALLL for loans and leases collectively evaluated for impairment       195,816 182,704  
Total allowance for loan and lease losses 189,904 182,837 179,874 205,026 189,904 182,837
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       136,399 150,367  
Loans and leases collectively evaluated for impairment       20,792,310 19,139,107  
Net Loans and Leases       20,928,709 19,289,474  
Non-PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 16,288 11,961 10,335      
Provisions 12,871 4,773 1,735      
Charge-offs (680) (1,012) (316)      
Recoveries 398 566 207      
Ending balance 28,877 16,288 11,961      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       151 123  
ALLL for loans and leases collectively evaluated for impairment       28,726 16,165  
Total allowance for loan and lease losses 16,288 11,961 10,335 28,877 16,288 11,961
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       1,045 3,094  
Loans and leases collectively evaluated for impairment       648,112 617,258  
Net Loans and Leases       649,157 620,352  
Non-PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 69,896 85,189 100,257      
Provisions (21,912) (15,822) (16,746)      
Charge-offs (987) (1,498) (1,147)      
Recoveries 1,281 2,027 2,825      
Ending balance 48,278 69,896 85,189      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       3,488 3,370  
ALLL for loans and leases collectively evaluated for impairment       44,790 66,526  
Total allowance for loan and lease losses 69,896 85,189 100,257 48,278 69,896 85,189
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       76,361 95,107  
Loans and leases collectively evaluated for impairment       8,949,859 8,179,441  
Net Loans and Leases       9,026,220 8,274,548  
Non-PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 2,168 732 1,009      
Provisions 925 1,569 (401)      
Charge-offs 0 (178) 0      
Recoveries 176 45 124      
Ending balance 3,269 2,168 732      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       152 289  
ALLL for loans and leases collectively evaluated for impairment       3,117 1,879  
Total allowance for loan and lease losses 2,168 732 1,009 3,269 2,168 732
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       1,563 427  
Loans and leases collectively evaluated for impairment       349,728 320,594  
Net Loans and Leases       351,291 321,021  
Non-PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 43,116 30,727 22,362      
Provisions 14,583 17,432 10,441      
Charge-offs (9,013) (5,952) (3,014)      
Recoveries 1,539 909 938      
Ending balance 50,225 43,116 30,727      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       1,732 1,118  
ALLL for loans and leases collectively evaluated for impairment       48,493 41,998  
Total allowance for loan and lease losses 43,116 30,727 22,362 50,225 43,116 30,727
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       12,600 17,910  
Loans and leases collectively evaluated for impairment       2,554,901 2,351,048  
Net Loans and Leases       2,567,501 2,368,958  
Non-PCI Loans | Commercial | Lease financing            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 5,524 4,286 4,749      
Provisions 635 1,602 (473)      
Charge-offs (442) (402) (100)      
Recoveries 190 38 110      
Ending balance 5,907 5,524 4,286      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       75 213  
ALLL for loans and leases collectively evaluated for impairment       5,832 5,311  
Total allowance for loan and lease losses 5,524 4,286 4,749 5,907 5,524 4,286
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       1,074 1,755  
Loans and leases collectively evaluated for impairment       825,196 729,023  
Net Loans and Leases       826,270 730,778  
Non-PCI Loans | Commercial | Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,855 3,184 190      
Provisions 877 (1,420) 3,007      
Charge-offs (144) 0 (13)      
Recoveries 539 91 0      
Ending balance 3,127 1,855 3,184      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       23 0  
ALLL for loans and leases collectively evaluated for impairment       3,104 1,855  
Total allowance for loan and lease losses 1,855 3,184 190 3,127 1,855 3,184
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       142 1,183  
Loans and leases collectively evaluated for impairment       340,122 313,649  
Net Loans and Leases       340,264 314,832  
Non-PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,485 892 681      
Provisions 45 541 245      
Charge-offs 0 (22) (118)      
Recoveries 66 74 84      
Ending balance 1,596 1,485 892      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       109 49  
ALLL for loans and leases collectively evaluated for impairment       1,487 1,436  
Total allowance for loan and lease losses 1,485 892 681 1,596 1,485 892
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       2,613 784  
Loans and leases collectively evaluated for impairment       228,787 219,289  
Net Loans and Leases       231,400 220,073  
Non-PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 14,105 10,661 10,511      
Provisions 9,448 4,202 1,219      
Charge-offs (926) (1,619) (1,260)      
Recoveries 467 861 191      
Ending balance 23,094 14,105 10,661      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       2,447 1,212  
ALLL for loans and leases collectively evaluated for impairment       20,647 12,893  
Total allowance for loan and lease losses 14,105 10,661 10,511 23,094 14,105 10,661
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       31,476 22,986  
Loans and leases collectively evaluated for impairment       2,857,648 2,672,999  
Net Loans and Leases       2,889,124 2,695,985  
Non-PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 15,971 18,650 16,239      
Provisions (1,234) (927) 6,301      
Charge-offs (3,287) (2,925) (4,744)      
Recoveries 916 1,173 854      
Ending balance 12,366 15,971 18,650      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       366 299  
ALLL for loans and leases collectively evaluated for impairment       12,000 15,672  
Total allowance for loan and lease losses 15,971 18,650 16,239 12,366 15,971 18,650
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       7,613 5,883  
Loans and leases collectively evaluated for impairment       2,593,731 2,517,223  
Net Loans and Leases       2,601,344 2,523,106  
Non-PCI Loans | Noncommercial | Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 19,496 16,555 13,541      
Provisions 18,632 10,987 9,932      
Charge-offs (14,108) (11,696) (9,787)      
Recoveries 4,267 3,650 2,869      
Ending balance 28,287 19,496 16,555      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
ALLL for loans and leases individually evaluated for impairment       667 527  
ALLL for loans and leases collectively evaluated for impairment       27,620 18,969  
Total allowance for loan and lease losses 19,496 16,555 13,541 28,287 19,496 16,555
Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment       1,912 1,238  
Loans and leases collectively evaluated for impairment       1,444,226 1,218,583  
Net Loans and Leases       1,446,138 1,219,821  
PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 16,312 21,629 53,520      
Provisions (1,929) (2,273) (14,620)      
Charge-offs (614) (3,044) (17,271)      
Recoveries 0 0 0      
Net charge-offs (614) (3,044) (17,271)      
Ending balance 13,769 16,312 21,629      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 16,312 21,629 53,520 13,769 16,312 21,629
PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,082 150 1,320      
Provisions (599) 1,029 1,284      
Charge-offs 0 (97) (2,454)      
Recoveries 0 0 0      
Ending balance 483 1,082 150      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 1,082 150 1,320 483 1,082 150
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       20,766 33,880  
PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 7,838 10,135 29,906      
Provisions (1,249) (1,426) (7,903)      
Charge-offs (166) (871) (11,868)      
Recoveries 0 0 0      
Ending balance 6,423 7,838 10,135      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 7,838 10,135 29,906 6,423 7,838 10,135
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       453,013 525,468  
PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 773 75 1,354      
Provisions (266) 698 (1,385)      
Charge-offs (5) 0 (106)      
Recoveries 0 0        
Ending balance 502 773 75      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 773 75 1,354 502 773 75
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       12,645 17,076  
PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 445 1,240 5,275      
Provisions 59 (470) (2,023)      
Charge-offs 0 (325) (2,012)      
Recoveries 0 0 0      
Ending balance 504 445 1,240      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 445 1,240 5,275 504 445 1,240
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       11,844 15,182  
PCI Loans | Noncommercial            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       309,199 356,902  
PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 0 183 682      
Provisions 0 (183) (395)      
Charge-offs 0 0 (104)      
Recoveries 0 0 0      
Ending balance 0 0 183      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 0 183 682 0 0 183
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       0 0  
PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 5,398 5,820 11,802      
Provisions (209) 72 (5,576)      
Charge-offs (371) (494) (406)      
Recoveries 0 0 0      
Ending balance 4,818 5,398 5,820      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 5,398 5,820 11,802 4,818 5,398 5,820
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       268,777 302,158  
PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 523 3,999 2,959      
Provisions 433 (2,720) 1,523      
Charge-offs 0 (756) (483)      
Recoveries 0 0 0      
Ending balance 956 523 3,999      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 523 3,999 2,959 956 523 3,999
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       38,650 52,471  
PCI Loans | Noncommercial | Consumer            
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       1,772 2,273  
PCI Loans | Noncommercial | Consumer and Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 253 27 222      
Provisions (98) 727 (145)      
Charge-offs (72) (501) (50)      
Recoveries 0 0 0      
Ending balance 83 253 27      
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses $ 253 $ 27 $ 222 83 253 $ 27
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]            
PCI Loans       $ 3,474 $ 4,281