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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans $ 638,018 $ 762,998 $ 834,167 $ 809,169
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 15,740,383 14,799,054    
PCI loans 317,014 393,419    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 10,486,372 9,729,022    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 471,532 473,433    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,189,337 2,730,407    
Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 616,951 894,801    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 296,988 302,176    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 679,203 669,215    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 15,283,183 14,348,308    
PCI loans 156,092 201,332    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 10,287,536 9,521,019    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 466,685 468,942    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,948,053 2,511,307    
Commercial | Pass | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 611,413 883,779    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 294,358 298,064    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 675,138 665,197    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 138,078 131,983    
PCI loans 52,204 63,257    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 95,843 78,643    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,311 1,260    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 35,171 44,130    
Commercial | Special Mention | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,382 4,340    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,038 2,919    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,333 691    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 136,723 161,794    
PCI loans 103,986 117,068    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 101,384 128,848    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,536 3,224    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 25,489 18,617    
Commercial | Substandard | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,156 6,585    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,592 1,193    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,566 3,327    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,359 647    
PCI loans 4,701 11,735    
Commercial | Doubtful | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 969 262    
Commercial | Doubtful | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
Commercial | Doubtful | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 390 385    
Commercial | Doubtful | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
Commercial | Doubtful | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
Commercial | Doubtful | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
Commercial | Ungraded        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 181,040 156,322    
PCI loans 31 27    
Commercial | Ungraded | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 640 250    
Commercial | Ungraded | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 7    
Commercial | Ungraded | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 180,234 155,968    
Commercial | Ungraded | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 97    
Commercial | Ungraded | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
Commercial | Ungraded | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 166 0    
Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 321,004      
Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans   369,579    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 24,248,329 22,833,827    
Past due loans 134,804 144,872    
Current loans 24,113,525 22,688,955    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 10,486,372 9,729,022    
Past due loans 23,924 21,153    
Current loans 10,462,448 9,707,869    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 471,532 473,433    
Past due loans 0 182    
Current loans 471,532 473,251    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,189,337 2,730,407    
Past due loans 12,810 9,470    
Current loans 3,176,527 2,720,937    
Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 616,951 894,801    
Past due loans 4,120 4,123    
Current loans 612,831 890,678    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 296,988 302,176    
Past due loans 204 327    
Current loans 296,784 301,849    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 679,203 669,215    
Past due loans 962 1,290    
Current loans 678,241 667,925    
Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,507,946 8,034,773    
Current loans 8,415,162 7,926,446    
Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,073,235 3,523,786    
Past due loans 45,894 57,851    
Current loans 4,027,341 3,465,935    
Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 241,436 248,289    
Past due loans 1,835 8,641    
Current loans 239,601 239,648    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,570,096 2,701,525    
Past due loans 30,520 27,135    
Current loans 2,539,576 2,674,390    
Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,623,179 1,561,173    
Past due loans 14,535 14,700    
Current loans 1,608,644 1,546,473    
PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 638,018 762,998    
PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 282,965      
PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans   318,632    
90 Days or greater | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 39,907 45,791    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,326 6,490    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 75    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,140 1,266    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 928 973    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 133    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 68 357    
90 Days or greater | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 31,445 36,497    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 16,147 21,901    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,507 1,379    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,788 10,222    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,003 2,995    
90 Days or greater | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 21,933      
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   31,392    
60 to 89 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 20,114 19,050    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,830 2,375    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 0    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,592 1,510    
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 102 167    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 63 6    
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 186 442    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,341 14,550    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,189 8,064    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 177 108    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,354 3,485    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,621 2,893    
60 to 89 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,968      
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   6,212    
30 to 59 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 74,783 80,031    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 15,768 12,288    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 107    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,078 6,694    
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,090 2,983    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 141 188    
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 708 491    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 46,998 57,280    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 24,558 27,886    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 151 7,154    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,378 13,428    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 7,911 8,812    
30 to 59 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 10,138      
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   $ 13,343