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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans $ 848,816 $ 809,169 $ 945,887 $ 950,516
Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 529,854 499,970    
Non-PCI loans 13,861,353 13,760,703    
Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 26,542 20,766    
Non-PCI loans 683,415 649,157    
Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 455,551 453,013    
Non-PCI loans 9,173,612 9,026,220    
Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 18,723 12,645    
Non-PCI loans 364,862 351,291    
Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 27,794 11,844    
Non-PCI loans 2,477,911 2,567,501    
Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 840,201 826,270    
Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 1,244 1,702    
Non-PCI loans 321,352 340,264    
Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 318,962 309,199    
Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 275,904 268,777    
Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 40,345 38,650    
Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 2,713 1,772    
PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 848,816 809,169    
PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 273,703 265,529    
PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 236,294 230,065    
PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 34,868 33,827    
PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 2,541 1,637    
Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 130,514 129,252    
Current loans 20,927,119 20,799,457    
Non-PCI loans 21,057,633 20,928,709    
Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,001 2,170    
Current loans 679,414 646,987    
Non-PCI loans 683,415 649,157    
Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 28,677 24,694    
Current loans 9,144,935 9,001,526    
Non-PCI loans 9,173,612 9,026,220    
Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 883 310    
Current loans 363,979 350,981    
Non-PCI loans 364,862 351,291    
Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 14,348 11,071    
Current loans 2,463,563 2,556,430    
Non-PCI loans 2,477,911 2,567,501    
Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,015 2,482    
Current loans 838,186 823,788    
Non-PCI loans 840,201 826,270    
Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 355 270    
Current loans 320,997 339,994    
Non-PCI loans 321,352 340,264    
Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 7,116,045 7,079,751    
Non-PCI loans 7,196,280 7,168,006    
Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,991 2,294    
Current loans 215,112 229,106    
Non-PCI loans 218,103 231,400    
Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 46,066 50,079    
Current loans 2,899,295 2,839,045    
Non-PCI loans 2,945,361 2,889,124    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 21,417 24,402    
Current loans 2,582,739 2,576,942    
Non-PCI loans 2,604,156 2,601,344    
Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,761 11,480    
Current loans 1,418,899 1,434,658    
Non-PCI loans 1,428,660 1,446,138    
90 Days or greater | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 28,676 26,589    
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 24,658 22,589    
90 Days or greater | PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,897 3,937    
90 Days or greater | PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 121 63    
90 Days or greater | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 37,023 37,904    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 102 286    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 8,750 10,329    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 530 0    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,229 1,051    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 290 863    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 161 198    
90 Days or greater | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 23,961 25,177    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,003 557    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 14,519 15,280    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 6,553 7,414    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,886 1,926    
60 to 89 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,287 6,800    
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,935 6,528    
60 to 89 Days past due | PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 349 268    
60 to 89 Days past due | PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3 4    
60 to 89 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 16,755 18,472    
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 2 39    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,633 2,773    
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 172 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 1,576 2,102    
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 733 444    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 0    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,639 13,114    
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 1,378 598    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,885 7,039    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,162 2,698    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,214 2,779    
30 to 59 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 11,296 10,281    
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,017 9,595    
30 to 59 Days past due | PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,231 618    
30 to 59 Days past due | PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 48 68    
30 to 59 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 76,736 72,876    
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 3,897 1,845    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 16,294 11,592    
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 181 310    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,543 7,918    
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 992 1,175    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 194 72    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 45,635 49,964    
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 610 1,139    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 27,662 27,760    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 11,702 14,290    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans $ 5,661 $ 6,775