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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans $ 674,269 $ 762,998 $ 894,863 $ 809,169
Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 336,109      
Non-PCI loans 15,474,736 14,799,054    
Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 715,011 669,215    
Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 10,278,741 9,729,022    
Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 473,452 473,433    
Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 3,097,541 2,730,407    
Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 613,377 894,801    
Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 296,614 302,176    
Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 338,160      
PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 674,269 762,998    
PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 299,579      
Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 121,511 144,872    
Current loans 23,742,657 22,688,955    
Non-PCI loans 23,864,168 22,833,827    
Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 862 1,290    
Current loans 714,149 667,925    
Non-PCI loans 715,011 669,215    
Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 20,740 21,153    
Current loans 10,258,001 9,707,869    
Non-PCI loans 10,278,741 9,729,022    
Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,586 182    
Current loans 471,866 473,251    
Non-PCI loans 473,452 473,433    
Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 11,343 9,470    
Current loans 3,086,198 2,720,937    
Non-PCI loans 3,097,541 2,730,407    
Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,180 4,123    
Current loans 608,197 890,678    
Non-PCI loans 613,377 894,801    
Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 59 327    
Current loans 296,555 301,849    
Non-PCI loans 296,614 302,176    
Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 8,307,691 7,926,446    
Non-PCI loans 8,389,432 8,034,773    
Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,361 8,641    
Current loans 248,343 239,648    
Non-PCI loans 250,704 248,289    
Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 44,780 57,851    
Current loans 3,936,065 3,465,935    
Non-PCI loans 3,980,845 3,523,786    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 23,137 27,135    
Current loans 2,581,818 2,674,390    
Non-PCI loans 2,604,955 2,701,525    
Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 11,463 14,700    
Current loans 1,541,465 1,546,473    
Non-PCI loans 1,552,928 1,561,173    
90 Days or greater | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 22,268      
90 Days or greater | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 38,410 45,791    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 132 357    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,599 6,490    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 18 75    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,155 1,266    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 951 973    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 133    
90 Days or greater | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 30,555 36,497    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 471 1,379    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 17,457 21,901    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,906 10,222    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,721 2,995    
60 to 89 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,167      
60 to 89 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 22,650 19,050    
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 264 442    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,021 2,375    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 0    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,743 1,510    
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,167 167    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 17 6    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 12,438 14,550    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 51 108    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 6,291 8,064    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,367 3,485    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,729 2,893    
30 to 59 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 12,146      
30 to 59 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 60,451 80,031    
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 466 491    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,120 12,288    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,568 107    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 6,445 6,694    
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,062 2,983    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 42 188    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 38,748 57,280    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,839 7,154    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 21,032 27,886    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,864 13,428    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans $ 6,013 $ 8,812