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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | $ 24,906,429 | $ 24,916,700 |  |
PCI loans | 557,356 | 606,576 | $ 703,837 | $ 762,998
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 16,140,020 | 16,137,227 |  |
PCI loans | 269,913 | 296,672 |  |
Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 10,747,715 | 10,717,234 |  |
Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 427,419 | 426,985 |  |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,879,575 | 3,938,730 |  |
Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 280,848 | 296,424 |  |
Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 804,463 | 757,854 |  |
Commercial | Pass |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 15,749,153 | 15,757,669 |  |
PCI loans | 131,018 | 141,922 |  |
Commercial | Pass | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 10,528,026 | 10,507,687 |  |
Commercial | Pass | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 423,288 | 422,500 |  |
Commercial | Pass | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,717,237 | 3,778,797 |  |
Commercial | Pass | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 279,899 | 294,700 |  |
Commercial | Pass | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 800,703 | 753,985 |  |
Commercial | Special Mention |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 162,280 | 174,700 |  |
PCI loans | 43,068 | 48,475 |  |
Commercial | Special Mention | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 110,413 | 114,219 |  |
Commercial | Special Mention | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,244 | 3,193 |  |
Commercial | Special Mention | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 46,928 | 54,814 |  |
Commercial | Special Mention | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 350 | 1,105 |  |
Commercial | Special Mention | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,345 | 1,369 |  |
Commercial | Substandard |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 150,620 | 127,842 |  |
PCI loans | 91,940 | 101,447 |  |
Commercial | Substandard | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 109,276 | 92,743 |  |
Commercial | Substandard | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 887 | 1,292 |  |
Commercial | Substandard | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 37,443 | 30,688 |  |
Commercial | Substandard | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 599 | 619 |  |
Commercial | Substandard | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,415 | 2,500 |  |
Commercial | Doubtful |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 354 | 354 |  |
PCI loans | 3,887 | 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 | 354 | 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 | 77,613 | 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 | 77,613 | 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 | 8,766,409 | 8,779,473 |  |
PCI loans | 287,443 |  |  |
Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 4,303,137 | 4,265,687 |  |
PCI loans |  | 309,904 |  |
Noncommercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 258,959 | 257,030 |  |
Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,469,898 | 2,542,975 |  |
Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,734,415 | 1,713,781 |  |
Non-PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 24,906,429 | 24,916,700 |  |
Past due loans | 142,668 | 134,882 |  |
Current loans | 24,763,761 | 24,781,818 |  |
Non-PCI Loans | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 16,140,020 | 16,137,227 |  |
Past due loans | 46,175 | 35,619 |  |
Current loans | 16,093,845 | 16,101,608 |  |
Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 10,747,715 | 10,717,234 |  |
Past due loans | 27,740 | 19,503 |  |
Current loans | 10,719,975 | 10,697,731 |  |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 427,419 | 426,985 |  |
Past due loans | 1,715 | 467 |  |
Current loans | 425,704 | 426,518 |  |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,879,575 | 3,938,730 |  |
Past due loans | 15,498 | 14,306 |  |
Current loans | 3,864,077 | 3,924,424 |  |
Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 280,848 | 296,424 |  |
Past due loans | 137 | 374 |  |
Current loans | 280,711 | 296,050 |  |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 804,463 | 757,854 |  |
Past due loans | 1,085 | 969 |  |
Current loans | 803,378 | 756,885 |  |
Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 8,766,409 | 8,779,473 |  |
Past due loans | 96,493 | 99,263 |  |
Current loans | 8,669,916 | 8,680,210 |  |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 4,303,137 | 4,265,687 |  |
Past due loans | 54,314 | 50,904 |  |
Current loans | 4,248,823 | 4,214,783 |  |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 258,959 | 257,030 |  |
Past due loans | 2,158 | 2,193 |  |
Current loans | 256,801 | 254,837 |  |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,469,898 | 2,542,975 |  |
Past due loans | 25,748 | 28,706 |  |
Current loans | 2,444,150 | 2,514,269 |  |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,734,415 | 1,713,781 |  |
Past due loans | 14,273 | 17,460 |  |
Current loans | 1,720,142 | 1,696,321 |  |
PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PCI loans | 557,356 |  |  |
PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current loans | 255,145 |  |  |
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 | 80,658 | 76,187 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 27,754 | 24,747 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 16,120 | 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 | 1,198 | 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 | 9,706 | 9,655 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 113 | 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 | 617 | 516 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 52,904 | 51,440 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 33,623 | 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 | 581 | 581 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 10,734 | 12,585 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 7,966 | 10,035 |  |
30 to 59 Days past due | PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 8,565 |  |  |
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 | 27,040 | 19,682 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 12,024 | 3,910 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 8,818 | 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 | 517 | 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 | 2,403 | 1,759 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 24 | 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 | 262 | 9 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 15,016 | 15,772 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 7,760 | 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 | 28 | 21 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 4,227 | 4,490 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 3,001 | 3,904 |  |
60 to 89 Days past due | PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 3,449 |  |  |
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 | 34,970 | 39,013 |  |
90 Days or greater | Non-PCI Loans | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 6,397 | 6,962 |  |
90 Days or greater | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 2,802 | 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 | 3,389 | 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 | 206 | 444 |  |
90 Days or greater | Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 28,573 | 32,051 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 12,931 | 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 | 1,549 | 1,591 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 10,787 | 11,631 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 3,306 | 3,521 |  |
90 Days or greater | PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | $ 20,284 |  |  |
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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