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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | $ 674,269 | $ 762,998 | $ 894,863 | $ 809,169
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 336,109 |  |  |
Non-PCI loans | 15,474,736 | 14,799,054 |  |
Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 715,011 | 669,215 |  |
Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 10,278,741 | 9,729,022 |  |
Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 473,452 | 473,433 |  |
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 3,097,541 | 2,730,407 |  |
Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 613,377 | 894,801 |  |
Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 296,614 | 302,176 |  |
Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 338,160 |  |  |
PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 674,269 | 762,998 |  |
PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 299,579 |  |  |
Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 121,511 | 144,872 |  |
Current loans | 23,742,657 | 22,688,955 |  |
Non-PCI loans | 23,864,168 | 22,833,827 |  |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 862 | 1,290 |  |
Current loans | 714,149 | 667,925 |  |
Non-PCI loans | 715,011 | 669,215 |  |
Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 20,740 | 21,153 |  |
Current loans | 10,258,001 | 9,707,869 |  |
Non-PCI loans | 10,278,741 | 9,729,022 |  |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,586 | 182 |  |
Current loans | 471,866 | 473,251 |  |
Non-PCI loans | 473,452 | 473,433 |  |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 11,343 | 9,470 |  |
Current loans | 3,086,198 | 2,720,937 |  |
Non-PCI loans | 3,097,541 | 2,730,407 |  |
Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 5,180 | 4,123 |  |
Current loans | 608,197 | 890,678 |  |
Non-PCI loans | 613,377 | 894,801 |  |
Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 59 | 327 |  |
Current loans | 296,555 | 301,849 |  |
Non-PCI loans | 296,614 | 302,176 |  |
Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 8,307,691 | 7,926,446 |  |
Non-PCI loans | 8,389,432 | 8,034,773 |  |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,361 | 8,641 |  |
Current loans | 248,343 | 239,648 |  |
Non-PCI loans | 250,704 | 248,289 |  |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 44,780 | 57,851 |  |
Current loans | 3,936,065 | 3,465,935 |  |
Non-PCI loans | 3,980,845 | 3,523,786 |  |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 23,137 | 27,135 |  |
Current loans | 2,581,818 | 2,674,390 |  |
Non-PCI loans | 2,604,955 | 2,701,525 |  |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 11,463 | 14,700 |  |
Current loans | 1,541,465 | 1,546,473 |  |
Non-PCI loans | 1,552,928 | 1,561,173 |  |
90 Days or greater | PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 22,268 |  |  |
90 Days or greater | Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 38,410 | 45,791 |  |
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 132 | 357 |  |
90 Days or greater | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 5,599 | 6,490 |  |
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 18 | 75 |  |
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,155 | 1,266 |  |
90 Days or greater | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 951 | 973 |  |
90 Days or greater | Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 0 | 133 |  |
90 Days or greater | Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 30,555 | 36,497 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 471 | 1,379 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 17,457 | 21,901 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 9,906 | 10,222 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,721 | 2,995 |  |
60 to 89 Days past due | PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 4,167 |  |  |
60 to 89 Days past due | Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 22,650 | 19,050 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 264 | 442 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 5,021 | 2,375 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 0 | 0 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,743 | 1,510 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,167 | 167 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 17 | 6 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 12,438 | 14,550 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 51 | 108 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 6,291 | 8,064 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,367 | 3,485 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,729 | 2,893 |  |
30 to 59 Days past due | PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 12,146 |  |  |
30 to 59 Days past due | Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 60,451 | 80,031 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 466 | 491 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 10,120 | 12,288 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,568 | 107 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 6,445 | 6,694 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,062 | 2,983 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 42 | 188 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 38,748 | 57,280 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,839 | 7,154 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 21,032 | 27,886 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 9,864 | 13,428 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | $ 6,013 | $ 8,812 |  |

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