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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | $ 170,374 | $ 245,485
Current loans | 32,345,815 | 32,546,490
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-PCI loans | 22,229,345 | 22,558,060
Commercial | Commercial and industrial and leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-PCI loans | 5,266,266 | 5,013,644
Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-PCI loans | 1,247,680 | 985,424
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-PCI loans | 9,913,589 | 9,771,033
Consumer | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-PCI loans | 391,768 | 348,123
Non-PCD Loans | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans |  | 67,117
Current loans |  | 22,490,943
Non-PCD Loans | Commercial | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 20,961 | 25,071
Current loans | 11,604,593 | 11,139,941
Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 8,713 | 18,343
Current loans | 2,994,215 | 2,969,346
Non-PCD Loans | Commercial | Commercial and industrial and leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 23,233 | 20,617
Current loans | 5,243,033 | 4,993,027
Non-PCD Loans | Commercial | Total commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 54,564 | 0
Current loans | 22,174,781 | 2,406,291
Non-PCD Loans | Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 1,657 | 3,086
Current loans | 1,246,023 | 982,338
Non-PCD Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 72,092 | 122,944
Current loans | 9,841,497 | 9,648,089
Non-PCD Loans | Consumer | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 2,266 | 1,339
Current loans | 389,502 | 346,784
Non-PCD Loans | Consumer | Consumer other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 4,614 | 6,579
Current loans | 630,794 | 546,389
PCD Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 43,718 | 55,424
Current loans | 329,537 | 407,458
30 to 59 Days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 61,934 | 121,499
30 to 59 Days past due | Non-PCD Loans | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans |  | 36,615
30 to 59 Days past due | Non-PCD Loans | Commercial | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 7,210 | 8,757
30 to 59 Days past due | Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 752 | 12,370
30 to 59 Days past due | Non-PCD Loans | Commercial | Commercial and industrial and leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 10,309 | 14,532
30 to 59 Days past due | Non-PCD Loans | Commercial | Total commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 18,504 | 0
30 to 59 Days past due | Non-PCD Loans | Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 233 | 956
30 to 59 Days past due | Non-PCD Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 32,023 | 66,562
30 to 59 Days past due | Non-PCD Loans | Consumer | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 477 | 932
30 to 59 Days past due | Non-PCD Loans | Consumer | Consumer other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 2,197 | 3,610
30 to 59 Days past due | PCD Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 11,407 | 18,322
60 to 89 Days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 27,296 | 26,043
60 to 89 Days past due | Non-PCD Loans | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans |  | 5,601
60 to 89 Days past due | Non-PCD Loans | Commercial | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 5,553 | 2,232
60 to 89 Days past due | Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 1,245 | 0
60 to 89 Days past due | Non-PCD Loans | Commercial | Commercial and industrial and leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 3,234 | 2,842
60 to 89 Days past due | Non-PCD Loans | Commercial | Total commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 10,032 | 0
60 to 89 Days past due | Non-PCD Loans | Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 0 | 527
60 to 89 Days past due | Non-PCD Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 12,064 | 14,366
60 to 89 Days past due | Non-PCD Loans | Consumer | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 1,719 | 77
60 to 89 Days past due | Non-PCD Loans | Consumer | Consumer other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 1,122 | 1,464
60 to 89 Days past due | PCD Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 5,200 | 6,076
90 Days or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 81,144 | 97,943
90 Days or greater | Non-PCD Loans | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans |  | 24,901
90 Days or greater | Non-PCD Loans | Commercial | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 8,198 | 14,082
90 Days or greater | Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 6,716 | 5,973
90 Days or greater | Non-PCD Loans | Commercial | Commercial and industrial and leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 9,690 | 3,243
90 Days or greater | Non-PCD Loans | Commercial | Total commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 26,028 | 0
90 Days or greater | Non-PCD Loans | Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 1,424 | 1,603
90 Days or greater | Non-PCD Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 28,005 | 42,016
90 Days or greater | Non-PCD Loans | Consumer | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 70 | 330
90 Days or greater | Non-PCD Loans | Consumer | Consumer other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | 1,295 | 1,505
90 Days or greater | PCD Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due loans | $ 27,111 | $ 31,026

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