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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans $ 26,682,922 $ 24,916,700    
PCI loans 513,589 606,576 $ 638,018 $ 762,998
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 17,319,338 16,137,227    
PCI loans 252,828 296,672    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,453,353 10,717,234    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 491,063 426,985    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,129,384 3,938,730    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 301,791 296,424    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 943,747 757,854    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16,914,956 15,757,669    
PCI loans 132,338 141,922    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,217,849 10,507,687    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 486,331 422,500    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,974,806 3,778,797    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 300,492 294,700    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 935,478 753,985    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 169,057 174,700    
PCI loans 43,535 48,475    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 111,617 114,219    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,191 3,193    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 51,355 54,814    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 599 1,105    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,295 1,369    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 165,686 127,842    
PCI loans 72,647 101,447    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 123,887 92,743    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,541 1,292    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 33,584 30,688    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 700 619    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 5,974 2,500    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 115 354    
PCI loans 4,308 4,828    
Commercial | Doubtful | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
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 115 354    
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 69,524 76,662    
Commercial | Ungraded | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 2,585    
Commercial | Ungraded | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
Commercial | Ungraded | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 69,524 74,077    
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 0 0    
Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 9,363,584 8,779,473    
PCI loans 260,761      
Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,869,562 4,265,687    
PCI loans   309,904    
Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 321,903 257,030    
Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,414,884 2,542,975    
Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,757,235 1,713,781    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 26,682,922 24,916,700    
Past due loans 160,974 134,882    
Current loans 26,521,948 24,781,818    
Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 17,319,338 16,137,227    
Past due loans 59,979 35,619    
Current loans 17,259,359 16,101,608    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,453,353 10,717,234    
Past due loans 35,393 19,503    
Current loans 11,417,960 10,697,731    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 491,063 426,985    
Past due loans 908 467    
Current loans 490,155 426,518    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,129,384 3,938,730    
Past due loans 18,645 14,306    
Current loans 4,110,739 3,924,424    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 301,791 296,424    
Past due loans 285 374    
Current loans 301,506 296,050    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 943,747 757,854    
Past due loans 4,748 969    
Current loans 938,999 756,885    
Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 9,363,584 8,779,473    
Past due loans 100,995 99,263    
Current loans 9,262,589 8,680,210    
Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,869,562 4,265,687    
Past due loans 58,962 50,904    
Current loans 4,810,600 4,214,783    
Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 321,903 257,030    
Past due loans 3,314 2,193    
Current loans 318,589 254,837    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,414,884 2,542,975    
Past due loans 23,106 28,706    
Current loans 2,391,778 2,514,269    
Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,757,235 1,713,781    
Past due loans 15,613 17,460    
Current loans 1,741,622 1,696,321    
PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 234,494      
PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans   268,280    
30 to 59 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 83,062 76,187    
30 to 59 Days past due | Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 33,328 24,747    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 22,270 14,200    
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 80 91    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,015 9,655    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 61 285    
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 902 516    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 49,734 51,440    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 29,551 28,239    
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 701 581    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,581 12,585    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,901 10,035    
30 to 59 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,613      
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   11,155    
60 to 89 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 24,987 19,682    
60 to 89 Days past due | Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 7,186 3,910    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,386 2,066    
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 130 76    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,373 1,759    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 211 0    
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 86 9    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 17,801 15,772    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 9,087 7,357    
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 1,013 21    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,219 4,490    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,482 3,904    
60 to 89 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,573      
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   7,708    
90 Days or greater | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 52,925 39,013    
90 Days or greater | Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 19,465 6,962    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,737 3,237    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 698 300    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,257 2,892    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 13 89    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,760 444    
90 Days or greater | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 33,460 32,051    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 20,324 15,308    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,600 1,591    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,306 11,631    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,230 3,521    
90 Days or greater | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 12,081      
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   $ 22,761