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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans $ 638,018 $ 762,998 $ 834,167 $ 809,169
Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 317,014 393,419    
Non-PCI loans 15,740,383 14,799,054    
Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 679,203 669,215    
Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 10,486,372 9,729,022    
Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 471,532 473,433    
Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 3,189,337 2,730,407    
Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 616,951 894,801    
Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 296,988 302,176    
Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 321,004      
Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans   369,579    
PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 638,018 762,998    
PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 282,965      
PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans   318,632    
Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 134,804 144,872    
Current loans 24,113,525 22,688,955    
Non-PCI loans 24,248,329 22,833,827    
Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 962 1,290    
Current loans 678,241 667,925    
Non-PCI loans 679,203 669,215    
Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 23,924 21,153    
Current loans 10,462,448 9,707,869    
Non-PCI loans 10,486,372 9,729,022    
Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 182    
Current loans 471,532 473,251    
Non-PCI loans 471,532 473,433    
Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 12,810 9,470    
Current loans 3,176,527 2,720,937    
Non-PCI loans 3,189,337 2,730,407    
Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,120 4,123    
Current loans 612,831 890,678    
Non-PCI loans 616,951 894,801    
Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 204 327    
Current loans 296,784 301,849    
Non-PCI loans 296,988 302,176    
Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 8,415,162 7,926,446    
Non-PCI loans 8,507,946 8,034,773    
Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,835 8,641    
Current loans 239,601 239,648    
Non-PCI loans 241,436 248,289    
Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 45,894 57,851    
Current loans 4,027,341 3,465,935    
Non-PCI loans 4,073,235 3,523,786    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 30,520 27,135    
Current loans 2,539,576 2,674,390    
Non-PCI loans 2,570,096 2,701,525    
Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 14,535 14,700    
Current loans 1,608,644 1,546,473    
Non-PCI loans 1,623,179 1,561,173    
90 Days or greater | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 21,933      
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans   31,392    
90 Days or greater | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 39,907 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 68 357    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,326 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 0 75    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,140 1,266    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 928 973    
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 31,445 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 1,507 1,379    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 16,147 21,901    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,788 10,222    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,003 2,995    
60 to 89 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,968      
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans   6,212    
60 to 89 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 20,114 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 186 442    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,830 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 2,592 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 102 167    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 63 6    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 14,341 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 177 108    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,189 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 5,354 3,485    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,621 2,893    
30 to 59 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,138      
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans   13,343    
30 to 59 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 74,783 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 708 491    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 15,768 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 0 107    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 8,078 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 3,090 2,983    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 141 188    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 46,998 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 151 7,154    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 24,558 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 14,378 13,428    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans $ 7,911 $ 8,812