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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PCI loans | $ 638,018 | $ 762,998 | $ 834,167 | $ 809,169
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 15,740,383 | 14,799,054 |  |
PCI loans | 317,014 | 393,419 |  |
Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 10,486,372 | 9,729,022 |  |
Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 471,532 | 473,433 |  |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,189,337 | 2,730,407 |  |
Commercial | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 616,951 | 894,801 |  |
Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 296,988 | 302,176 |  |
Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 679,203 | 669,215 |  |
Commercial | Pass |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 15,283,183 | 14,348,308 |  |
PCI loans | 156,092 | 201,332 |  |
Commercial | Pass | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 10,287,536 | 9,521,019 |  |
Commercial | Pass | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 466,685 | 468,942 |  |
Commercial | Pass | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,948,053 | 2,511,307 |  |
Commercial | Pass | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 611,413 | 883,779 |  |
Commercial | Pass | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 294,358 | 298,064 |  |
Commercial | Pass | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 675,138 | 665,197 |  |
Commercial | Special Mention |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 138,078 | 131,983 |  |
PCI loans | 52,204 | 63,257 |  |
Commercial | Special Mention | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 95,843 | 78,643 |  |
Commercial | Special Mention | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,311 | 1,260 |  |
Commercial | Special Mention | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 35,171 | 44,130 |  |
Commercial | Special Mention | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,382 | 4,340 |  |
Commercial | Special Mention | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,038 | 2,919 |  |
Commercial | Special Mention | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,333 | 691 |  |
Commercial | Substandard |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 136,723 | 161,794 |  |
PCI loans | 103,986 | 117,068 |  |
Commercial | Substandard | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 101,384 | 128,848 |  |
Commercial | Substandard | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,536 | 3,224 |  |
Commercial | Substandard | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 25,489 | 18,617 |  |
Commercial | Substandard | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,156 | 6,585 |  |
Commercial | Substandard | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,592 | 1,193 |  |
Commercial | Substandard | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,566 | 3,327 |  |
Commercial | Doubtful |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,359 | 647 |  |
PCI loans | 4,701 | 11,735 |  |
Commercial | Doubtful | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 969 | 262 |  |
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 | 390 | 385 |  |
Commercial | Doubtful | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 0 | 0 |  |
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 | 181,040 | 156,322 |  |
PCI loans | 31 | 27 |  |
Commercial | Ungraded | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 640 | 250 |  |
Commercial | Ungraded | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 0 | 7 |  |
Commercial | Ungraded | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 180,234 | 155,968 |  |
Commercial | Ungraded | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 0 | 97 |  |
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 | 166 | 0 |  |
Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PCI loans | 321,004 |  |  |
Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PCI loans |  | 369,579 |  |
Non-PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 24,248,329 | 22,833,827 |  |
Past due loans | 134,804 | 144,872 |  |
Current loans | 24,113,525 | 22,688,955 |  |
Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 10,486,372 | 9,729,022 |  |
Past due loans | 23,924 | 21,153 |  |
Current loans | 10,462,448 | 9,707,869 |  |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 471,532 | 473,433 |  |
Past due loans | 0 | 182 |  |
Current loans | 471,532 | 473,251 |  |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 3,189,337 | 2,730,407 |  |
Past due loans | 12,810 | 9,470 |  |
Current loans | 3,176,527 | 2,720,937 |  |
Non-PCI Loans | Commercial | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 616,951 | 894,801 |  |
Past due loans | 4,120 | 4,123 |  |
Current loans | 612,831 | 890,678 |  |
Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 296,988 | 302,176 |  |
Past due loans | 204 | 327 |  |
Current loans | 296,784 | 301,849 |  |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 679,203 | 669,215 |  |
Past due loans | 962 | 1,290 |  |
Current loans | 678,241 | 667,925 |  |
Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 8,507,946 | 8,034,773 |  |
Current loans | 8,415,162 | 7,926,446 |  |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 4,073,235 | 3,523,786 |  |
Past due loans | 45,894 | 57,851 |  |
Current loans | 4,027,341 | 3,465,935 |  |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 241,436 | 248,289 |  |
Past due loans | 1,835 | 8,641 |  |
Current loans | 239,601 | 239,648 |  |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 2,570,096 | 2,701,525 |  |
Past due loans | 30,520 | 27,135 |  |
Current loans | 2,539,576 | 2,674,390 |  |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-PCI loans | 1,623,179 | 1,561,173 |  |
Past due loans | 14,535 | 14,700 |  |
Current loans | 1,608,644 | 1,546,473 |  |
PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PCI loans | 638,018 | 762,998 |  |
PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current loans | 282,965 |  |  |
PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current loans |  | 318,632 |  |
90 Days or greater | Non-PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 39,907 | 45,791 |  |
90 Days or greater | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 5,326 | 6,490 |  |
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 0 | 75 |  |
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 2,140 | 1,266 |  |
90 Days or greater | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 928 | 973 |  |
90 Days or greater | Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 0 | 133 |  |
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 68 | 357 |  |
90 Days or greater | Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 31,445 | 36,497 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 16,147 | 21,901 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 1,507 | 1,379 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 10,788 | 10,222 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 3,003 | 2,995 |  |
90 Days or greater | PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 21,933 |  |  |
90 Days or greater | PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans |  | 31,392 |  |
60 to 89 Days past due | Non-PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 20,114 | 19,050 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 2,830 | 2,375 |  |
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 | 0 | 0 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 2,592 | 1,510 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 102 | 167 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 63 | 6 |  |
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 | 186 | 442 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 14,341 | 14,550 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 5,189 | 8,064 |  |
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 | 177 | 108 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 5,354 | 3,485 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 3,621 | 2,893 |  |
60 to 89 Days past due | PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 5,968 |  |  |
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans |  | 6,212 |  |
30 to 59 Days past due | Non-PCI Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 74,783 | 80,031 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 15,768 | 12,288 |  |
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 | 107 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 8,078 | 6,694 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 3,090 | 2,983 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 141 | 188 |  |
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 | 708 | 491 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 46,998 | 57,280 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 24,558 | 27,886 |  |
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 | 151 | 7,154 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 14,378 | 13,428 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | 7,911 | 8,812 |  |
30 to 59 Days past due | PCI Loans | Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | $ 10,138 |  |  |
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans |  | $ 13,343 |  |

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