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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 |  |

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