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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Evaluated for Impairment [Abstract]              
Net Loans and Leases       $ 28,656,355 $ 25,299,564    
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]              
ALLL for loans and leases acquired with deteriorated credit quality       225,141 223,712    
PCI Loans       558,716 606,576 $ 762,998 $ 809,169
Commercial              
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]              
PCI Loans       284,329 296,672    
Non-PCI Loans              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance $ 214,568 $ 211,867 $ 205,026        
Provisions 33,049 29,232 29,139        
Charge-offs (43,027) (39,554) (36,386)        
Recoveries 13,015 13,023 14,088        
Ending balance 217,605 214,568 211,867        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       12,915 9,827    
ALLL for loans and leases collectively evaluated for impairment       204,690 204,741    
Total allowance for loan and lease losses 217,605 214,568 211,867 217,605 214,568 211,867 205,026
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       185,599 146,430    
Loans and leases collectively evaluated for impairment       28,137,181 24,770,270    
Net Loans and Leases       28,322,780 24,916,700    
Non-PCI Loans | Commercial              
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       5,634 4,445    
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       88,893 68,641    
Non-PCI Loans | Commercial | Construction and land development              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 35,270 24,470 28,877        
Provisions (2,171) 10,533 (4,329)        
Charge-offs (196) (44) (599)        
Recoveries 310 311 521        
Ending balance 33,213 35,270 24,470        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       463 490    
ALLL for loans and leases collectively evaluated for impairment       32,750 34,780    
Total allowance for loan and lease losses 33,213 35,270 24,470 33,213 35,270 24,470 28,877
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       4,655 2,175    
Loans and leases collectively evaluated for impairment       1,008,799 755,679    
Net Loans and Leases       1,013,454 757,854    
Non-PCI Loans | Commercial | Mortgage              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 43,451 45,005 48,278        
Provisions 2,384 (1,490) (5,694)        
Charge-offs (1,096) (1,140) (421)        
Recoveries 596 1,076 2,842        
Ending balance 45,335 43,451 45,005        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       3,650 2,671    
ALLL for loans and leases collectively evaluated for impairment       41,685 40,780    
Total allowance for loan and lease losses 45,335 43,451 45,005 45,335 43,451 45,005 48,278
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       70,149 55,447    
Loans and leases collectively evaluated for impairment       12,212,486 10,661,787    
Net Loans and Leases       12,282,635 10,717,234    
Non-PCI Loans | Commercial | Other commercial real estate              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 2,481 4,571 3,269        
Provisions (285) (2,171) 1,280        
Charge-offs 0 (69) (5)        
Recoveries 15 150 27        
Ending balance 2,211 2,481 4,571        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       39 42    
ALLL for loans and leases collectively evaluated for impairment       2,172 2,439    
Total allowance for loan and lease losses 2,211 2,481 4,571 2,211 2,481 4,571 3,269
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       1,268 860    
Loans and leases collectively evaluated for impairment       540,760 426,125    
Net Loans and Leases       542,028 426,985    
Non-PCI Loans | Commercial | Commercial and industrial              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 55,620 59,824 56,132        
Provisions 14,212 2,511 11,624        
Charge-offs (13,352) (10,211) (11,921)        
Recoveries 2,894 3,496 3,989        
Ending balance 59,374 55,620 59,824        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       1,379 1,137    
ALLL for loans and leases collectively evaluated for impairment       57,995 54,483    
Total allowance for loan and lease losses 55,620 55,620 59,824 59,374 55,620 59,824 56,132
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       12,182 9,868    
Loans and leases collectively evaluated for impairment       4,391,610 3,928,862    
Net Loans and Leases       4,403,792 3,938,730    
Non-PCI Loans | Commercial | Other              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 2,221 4,689 3,127        
Provisions (754) (2,827) 2,189        
Charge-offs (100) (130) (912)        
Recoveries 869 489 285        
Ending balance 2,236 2,221 4,689        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       103 105    
ALLL for loans and leases collectively evaluated for impairment       2,133 2,116    
Total allowance for loan and lease losses 2,236 2,221 4,689 2,236 2,221 4,689 3,127
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       639 291    
Loans and leases collectively evaluated for impairment       309,454 296,133    
Net Loans and Leases       310,093 296,424    
Non-PCI Loans | Noncommercial              
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       7,281 5,382    
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       96,706 77,789    
Non-PCI Loans | Noncommercial | Construction and land development              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 2,350 3,962 1,596        
Provisions 359 (1,520) 2,366        
Charge-offs 0 (219) 0        
Recoveries 0 127 0        
Ending balance 2,709 2,350 3,962        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       174 81    
ALLL for loans and leases collectively evaluated for impairment       2,535 2,269    
Total allowance for loan and lease losses 2,709 2,350 3,962 2,709 2,350 3,962 1,596
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       3,882 3,749    
Loans and leases collectively evaluated for impairment       353,503 253,281    
Net Loans and Leases       357,385 257,030    
Non-PCI Loans | Noncommercial | Mortgage              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 15,472 15,706 14,447        
Provisions 3,481 897 2,096        
Charge-offs (1,137) (1,689) (1,376)        
Recoveries 416 558 539        
Ending balance 18,232 15,472 15,706        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       3,278 1,901    
ALLL for loans and leases collectively evaluated for impairment       14,954 13,571    
Total allowance for loan and lease losses 15,472 15,472 15,706 18,232 15,472 15,706 14,447
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       60,442 42,168    
Loans and leases collectively evaluated for impairment       5,233,475 4,223,519    
Net Loans and Leases       5,293,917 4,265,687    
Non-PCI Loans | Noncommercial | Revolving mortgage              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 21,862 22,436 21,013        
Provisions (788) 1,112 2,509        
Charge-offs (2,584) (3,235) (2,368)        
Recoveries 1,212 1,549 1,282        
Ending balance 19,702 21,862 22,436        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       2,722 2,515    
ALLL for loans and leases collectively evaluated for impairment       16,980 19,347    
Total allowance for loan and lease losses 21,862 21,862 22,436 19,702 21,862 22,436 21,013
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       28,869 28,852    
Loans and leases collectively evaluated for impairment       2,310,203 2,514,123    
Net Loans and Leases       2,339,072 2,542,975    
Non-PCI Loans | Noncommercial | Consumer              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 35,841 31,204 28,287        
Provisions 16,611 22,187 17,098        
Charge-offs (24,562) (22,817) (18,784)        
Recoveries 6,703 5,267 4,603        
Ending balance 34,593 35,841 31,204        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
ALLL for loans and leases individually evaluated for impairment       1,107 885    
ALLL for loans and leases collectively evaluated for impairment       33,486 34,956    
Total allowance for loan and lease losses 35,841 35,841 31,204 34,593 35,841 31,204 28,287
Loans and Leases Evaluated for Impairment [Abstract]              
Loans and leases individually evaluated for impairment       3,513 3,020    
Loans and leases collectively evaluated for impairment       1,776,891 1,710,761    
Net Loans and Leases       1,780,404 1,713,781    
PCI Loans              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance 9,144 10,026 13,769        
Provisions (1,608) (765) (3,447)        
Charge-offs 0 (117) (296)        
Recoveries 0 0 0        
Ending balance 7,536 9,144 10,026        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]              
Total allowance for loan and lease losses $ 7,536 $ 10,026 $ 10,026 $ 7,536 $ 9,144 $ 10,026 $ 13,769