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Loans and Leases (Loans Acquired By Loan Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | $ 28,322,780 | $ 24,916,700 |  |
PCI Loans | 558,716 | 606,576 | $ 762,998 | $ 809,169
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 18,552,002 | 16,137,227 |  |
PCI Loans | 284,329 | 296,672 |  |
Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,013,454 | 757,854 |  |
Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 12,282,635 | 10,717,234 |  |
Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 542,028 | 426,985 |  |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 4,403,792 | 3,938,730 |  |
Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 310,093 | 296,424 |  |
Noncommercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 9,770,778 | 8,779,473 |  |
Noncommercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 357,385 | 257,030 |  |
Noncommercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 5,293,917 | 4,265,687 |  |
Noncommercial | Revolving mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 2,339,072 | 2,542,975 |  |
Noncommercial | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,780,404 | 1,713,781 |  |
Pass | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 18,157,655 | 15,757,669 |  |
PCI Loans | 148,412 | 141,922 |  |
Pass | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,004,922 | 753,985 |  |
Pass | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 12,050,799 | 10,507,687 |  |
Pass | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 536,682 | 422,500 |  |
Pass | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 4,256,456 | 3,778,797 |  |
Pass | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 308,796 | 294,700 |  |
Special mention | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 166,866 | 174,700 |  |
PCI Loans | 44,290 | 48,475 |  |
Special mention | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 2,577 | 1,369 |  |
Special mention | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 115,164 | 114,219 |  |
Special mention | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 3,899 | 3,193 |  |
Special mention | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 44,604 | 54,814 |  |
Special mention | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 622 | 1,105 |  |
Substandard | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 158,897 | 127,842 |  |
PCI Loans | 87,970 | 101,447 |  |
Substandard | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 5,955 | 2,500 |  |
Substandard | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 116,672 | 92,743 |  |
Substandard | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,447 | 1,292 |  |
Substandard | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 34,148 | 30,688 |  |
Substandard | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 675 | 619 |  |
Doubtful | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 3 | 354 |  |
PCI Loans | 3,657 | 4,828 |  |
Doubtful | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 0 |  |
Doubtful | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 0 |  |
Doubtful | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 0 |  |
Doubtful | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 3 | 354 |  |
Doubtful | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 0 |  |
Ungraded | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 68,581 | 76,662 |  |
PCI Loans | 0 | 0 |  |
Ungraded | Commercial | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 0 |  |
Ungraded | Commercial | Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 2,585 |  |
Ungraded | Commercial | Other commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 0 | 0 |  |
Ungraded | Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 68,581 | 74,077 |  |
Ungraded | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | $ 0 | $ 0 |  |

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