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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans $ 26,176,790 $ 24,916,700    
PCI loans 551,447 606,576 $ 674,269 $ 762,998
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16,844,828 16,137,227    
PCI loans 275,637 296,672    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,336,684 10,717,234    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 506,760 426,985    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,980,504 3,938,730    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 301,346 296,424    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 719,534 757,854    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16,438,380 15,757,669    
PCI loans 138,300 141,922    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,093,853 10,507,687    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 502,168 422,500    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,825,956 3,778,797    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 300,335 294,700    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 716,068 753,985    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 163,742 174,700    
PCI loans 44,324 48,475    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 111,721 114,219    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,575 3,193    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 46,960 54,814    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 470 1,105    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,016 1,369    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 173,198 127,842    
PCI loans 90,019 101,447    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 131,110 92,743    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,017 1,292    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 38,080 30,688    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 541 619    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,450 2,500    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 96 354    
PCI loans 2,994 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 96 354    
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 69,412 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 69,412 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 9,331,962 8,779,473    
PCI loans 275,810      
Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,790,636 4,265,687    
PCI loans   309,904    
Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 315,071 257,030    
Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,470,653 2,542,975    
Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,755,602 1,713,781    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 26,176,790 24,916,700    
Past due loans 154,074 134,882    
Current loans 26,022,716 24,781,818    
Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16,844,828 16,137,227    
Past due loans 56,153 35,619    
Current loans 16,788,675 16,101,608    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,336,684 10,717,234    
Past due loans 30,311 19,503    
Current loans 11,306,373 10,697,731    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 506,760 426,985    
Past due loans 698 467    
Current loans 506,062 426,518    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,980,504 3,938,730    
Past due loans 20,283 14,306    
Current loans 3,960,221 3,924,424    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 301,346 296,424    
Past due loans 73 374    
Current loans 301,273 296,050    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 719,534 757,854    
Past due loans 4,788 969    
Current loans 714,746 756,885    
Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 9,331,962 8,779,473    
Past due loans 97,921 99,263    
Current loans 9,234,041 8,680,210    
Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,790,636 4,265,687    
Past due loans 54,573 50,904    
Current loans 4,736,063 4,214,783    
Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 315,071 257,030    
Past due loans 2,086 2,193    
Current loans 312,985 254,837    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,470,653 2,542,975    
Past due loans 26,606 28,706    
Current loans 2,444,047 2,514,269    
Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,755,602 1,713,781    
Past due loans 14,656 17,460    
Current loans 1,740,946 1,696,321    
PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 244,196      
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 77,982 76,187    
30 to 59 Days past due | Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 28,788 24,747    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,025 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 0 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 13,227 9,655    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 68 285    
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 1,468 516    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 49,194 51,440    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 26,250 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 255 581    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,044 12,585    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,645 10,035    
30 to 59 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,691      
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 34,358 19,682    
60 to 89 Days past due | Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,729 3,910    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 9,073 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 698 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 3,196 1,759    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5 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 1,757 9    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 19,629 15,772    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 13,109 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 214 21    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,207 4,490    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,099 3,904    
60 to 89 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,763      
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 41,734 39,013    
90 Days or greater | Non-PCI Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 12,636 6,962    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 7,213 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 0 300    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,860 2,892    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 89    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,563 444    
90 Days or greater | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 29,098 32,051    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 15,214 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 1,617 1,591    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 9,355 11,631    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,912 3,521    
90 Days or greater | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 18,160      
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans   $ 22,761