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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, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Net loans and leases     $ 23,388,861 $ 23,374,932    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     703,837 762,998 $ 848,816 $ 809,169
Allowance for loan and lease losses     223,116 221,893    
Commercial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     355,928 393,419    
Commercial | Construction and land development            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     9,316 10,135    
Commercial | Mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     325,073 358,103    
Commercial | Other commercial real estate            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     16,179 17,124    
Commercial | Commercial and industrial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     3,732 6,374    
Commercial | Other            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     1,628 1,683    
Noncommercial            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     347,909 369,579    
Noncommercial | Construction and land development            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     3,006 4,163    
Noncommercial | Mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     282,338 299,318    
Noncommercial | Revolving mortgage            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     60,388 63,908    
Noncommercial | Consumer            
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     2,177 2,190    
Non-PCI Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Impaired Financing Receivable, Related Allowance     9,866 9,728    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 211,867 $ 205,026        
Provision for Loan, Lease, and Other Losses 5,251 11,076        
Charge-offs (9,613) (8,709)        
Recoveries 3,315 2,626        
Ending balance 210,820 210,019        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     155,950 155,646    
Loans and leases collectively evaluated for impairment     22,752,190 22,678,181    
Net loans and leases     22,908,140 22,833,827    
ALLL for loans and leases individually evaluated for impairment     9,866 9,728    
ALLL for loans and leases collectively evaluated for impairment     200,954 202,139    
Total allowance for loan and lease losses 211,867 205,026 210,820 211,867 210,019 205,026
Non-PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 24,470 28,877        
Provision for Loan, Lease, and Other Losses 2,225 2,536        
Charge-offs 0 (77)        
Recoveries 23 55        
Ending balance 26,718 31,391        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,131 788    
Loans and leases collectively evaluated for impairment     737,282 668,427    
Net loans and leases     738,413 669,215    
ALLL for loans and leases individually evaluated for impairment     171 185    
ALLL for loans and leases collectively evaluated for impairment     26,547 24,285    
Total allowance for loan and lease losses 24,470 28,877 26,718 24,470 31,391 28,877
Non-PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 45,005 48,278        
Provision for Loan, Lease, and Other Losses (1,365) 6        
Charge-offs (46) (37)        
Recoveries 239 364        
Ending balance 43,833 48,611        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     70,277 73,655    
Loans and leases collectively evaluated for impairment     9,788,859 9,655,367    
Net loans and leases     9,859,136 9,729,022    
ALLL for loans and leases individually evaluated for impairment     3,521 3,648    
ALLL for loans and leases collectively evaluated for impairment     40,312 41,357    
Total allowance for loan and lease losses 45,005 48,278 43,833 45,005 48,611 48,278
Non-PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 4,571 3,269        
Provision for Loan, Lease, and Other Losses (1,293) 304        
Charge-offs 0 (5)        
Recoveries 145 4        
Ending balance 3,423 3,572        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     1,499 1,857    
Loans and leases collectively evaluated for impairment     385,235 471,576    
Net loans and leases     386,734 473,433    
ALLL for loans and leases individually evaluated for impairment     306 209    
ALLL for loans and leases collectively evaluated for impairment     3,117 4,362    
Total allowance for loan and lease losses 4,571 3,269 3,423 4,571 3,572 3,269
Non-PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 53,697 50,225        
Provision for Loan, Lease, and Other Losses (425) 3,592        
Charge-offs (1,475) (3,253)        
Recoveries 1,219 265        
Ending balance 53,016 50,829        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     7,611 7,974    
Loans and leases collectively evaluated for impairment     2,687,594 2,722,433    
Net loans and leases     2,695,205 2,730,407    
ALLL for loans and leases individually evaluated for impairment     621 665    
ALLL for loans and leases collectively evaluated for impairment     52,395 53,032    
Total allowance for loan and lease losses 53,697 50,225 53,016 53,697 50,829 50,225
Non-PCI Loans | Commercial | Lease financing            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 6,127 5,907        
Provision for Loan, Lease, and Other Losses 987 575        
Charge-offs (854) (173)        
Recoveries 41 6        
Ending balance 6,301 6,315        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     2,166 1,914    
Loans and leases collectively evaluated for impairment     908,423 892,887    
Net loans and leases     910,589 894,801    
ALLL for loans and leases individually evaluated for impairment     494 397    
ALLL for loans and leases collectively evaluated for impairment     5,807 5,730    
Total allowance for loan and lease losses 6,127 5,907 6,301 6,127 6,315 5,907
Non-PCI Loans | Commercial | Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 4,689 3,127        
Provision for Loan, Lease, and Other Losses 114 517        
Charge-offs (3) (123)        
Recoveries 42 13        
Ending balance 4,842 3,534        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     0 521    
Loans and leases collectively evaluated for impairment     281,485 301,655    
Net loans and leases     281,485 302,176    
ALLL for loans and leases individually evaluated for impairment     0 0    
ALLL for loans and leases collectively evaluated for impairment     4,842 4,689    
Total allowance for loan and lease losses 4,689 3,127 4,842 4,689 3,534 3,127
Non-PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 3,962 1,596        
Provision for Loan, Lease, and Other Losses 107 (83)        
Charge-offs (182) 0        
Recoveries 26 0        
Ending balance 3,913 1,513        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     3,803 4,551    
Loans and leases collectively evaluated for impairment     239,311 243,738    
Net loans and leases     243,114 248,289    
ALLL for loans and leases individually evaluated for impairment     82 68    
ALLL for loans and leases collectively evaluated for impairment     3,831 3,894    
Total allowance for loan and lease losses 3,962 1,596 3,913 3,962 1,513 1,596
Non-PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 15,706 14,447        
Provision for Loan, Lease, and Other Losses 1,512 1,351        
Charge-offs (806) (250)        
Recoveries 77 287        
Ending balance 16,489 15,835        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     41,347 37,842    
Loans and leases collectively evaluated for impairment     3,546,444 3,485,944    
Net loans and leases     3,587,791 3,523,786    
ALLL for loans and leases individually evaluated for impairment     2,905 2,733    
ALLL for loans and leases collectively evaluated for impairment     13,584 12,973    
Total allowance for loan and lease losses 15,706 14,447 16,489 15,706 15,835 14,447
Non-PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 22,436 21,013        
Provision for Loan, Lease, and Other Losses 466 550        
Charge-offs (992) (825)        
Recoveries 194 552        
Ending balance 22,104 21,290        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     25,525 23,770    
Loans and leases collectively evaluated for impairment     2,626,123 2,677,755    
Net loans and leases     2,651,648 2,701,525    
ALLL for loans and leases individually evaluated for impairment     1,053 1,085    
ALLL for loans and leases collectively evaluated for impairment     21,051 21,351    
Total allowance for loan and lease losses 22,436 21,013 22,104 22,436 21,290 21,013
Non-PCI Loans | Noncommercial | Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 31,204 28,287        
Provision for Loan, Lease, and Other Losses 2,923 1,728        
Charge-offs (5,255) (3,966)        
Recoveries 1,309 1,080        
Ending balance 30,181 27,129        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Loans and leases individually evaluated for impairment     2,591 2,774    
Loans and leases collectively evaluated for impairment     1,551,434 1,558,399    
Net loans and leases     1,554,025 1,561,173    
ALLL for loans and leases individually evaluated for impairment     713 738    
ALLL for loans and leases collectively evaluated for impairment     29,468 30,466    
Total allowance for loan and lease losses 31,204 28,287 30,181 31,204 27,129 28,287
PCI Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 10,026 13,769        
Provision for Loan, Lease, and Other Losses 2,354 (2,845)        
Charge-offs (84) 0        
Recoveries 0 0        
Ending balance 12,296 10,924        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 10,026 13,769 12,296 10,026 10,924 13,769
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     703,837 762,998    
PCI Loans | Commercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 142 483        
Provision for Loan, Lease, and Other Losses 310 (186)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 452 297        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 142 483 452 142 297 483
PCI Loans | Commercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 6,564 6,423        
Provision for Loan, Lease, and Other Losses 1,608 (1,230)        
Charge-offs (84) 0        
Recoveries 0 0        
Ending balance 8,088 5,193        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 6,564 6,423 8,088 6,564 5,193 6,423
PCI Loans | Commercial | Other commercial real estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 221 502        
Provision for Loan, Lease, and Other Losses (46) (158)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 175 344        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 221 502 175 221 344 502
PCI Loans | Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 306 504        
Provision for Loan, Lease, and Other Losses 13 (142)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 319 362        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 306 504 319 306 362 504
PCI Loans | Noncommercial | Construction and land development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 193 0        
Provision for Loan, Lease, and Other Losses (50) 0        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 143 0        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 193 0 143 193 0 0
PCI Loans | Noncommercial | Mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 2,117 4,818        
Provision for Loan, Lease, and Other Losses 264 (545)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 2,381 4,273        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 2,117 4,818 2,381 2,117 4,273 4,818
PCI Loans | Noncommercial | Revolving mortgage            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 259 956        
Provision for Loan, Lease, and Other Losses 209 (550)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 468 406        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses 259 956 468 259 406 956
PCI Loans | Noncommercial | Consumer and Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 224 83        
Provision for Loan, Lease, and Other Losses 46 (34)        
Charge-offs 0 0        
Recoveries 0 0        
Ending balance 270 49        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]            
Total allowance for loan and lease losses $ 224 $ 83 270 224 $ 49 $ 83
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]            
Loans and leases acquired with deteriorated credit quality     $ 3,805 $ 3,873