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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | $ 558,716 |  | $ 606,576 | $ 762,998 | $ 809,169
Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | 284,329 |  | 296,672 |  |
Commercial | Pass |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | 148,412 |  | 141,922 |  |
Commercial | Special mention |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | 44,290 |  | 48,475 |  |
Commercial | Substandard |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | 87,970 |  | 101,447 |  |
Commercial | Doubtful |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | 3,657 |  | 4,828 |  |
Commercial | Ungraded |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
PCI commercial loans | 0 |  | 0 |  |
Non-PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 28,116,245 |  | 24,781,818 |  |
Past Due | 206,535 |  | 134,882 |  |
Nonaccruing | 114,946 |  | 84,546 |  |
Non-PCI Loans | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 18,477,856 |  | 16,101,608 |  |
Past Due | 74,146 |  | 35,619 |  |
Nonaccruing | 42,407 |  | 18,529 |  |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 1,007,411 |  | 756,885 |  |
Past Due | 6,043 |  | 969 |  |
Nonaccruing | 4,281 |  | 666 |  |
Non-PCI Loans | Commercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 12,245,153 |  | 10,697,731 |  |
Past Due | 37,482 |  | 19,503 |  |
Nonaccruing | 29,733 |  | 12,594 |  |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 540,138 |  | 426,518 |  |
Past Due | 1,890 |  | 467 |  |
Nonaccruing | 708 |  | 366 |  |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 4,375,649 |  | 3,924,424 |  |
Past Due | 28,143 |  | 14,306 |  |
Nonaccruing | 7,365 |  | 4,624 |  |
Non-PCI Loans | Commercial | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 309,505 |  | 296,050 |  |
Past Due | 588 |  | 374 |  |
Nonaccruing | 320 |  | 279 |  |
Non-PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 9,638,389 |  | 8,680,210 |  |
Past Due | 132,389 |  | 99,263 |  |
Nonaccruing | 72,539 |  | 66,017 |  |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 354,393 |  | 254,837 |  |
Past Due | 2,992 |  | 2,193 |  |
Nonaccruing | 2,828 |  | 1,823 |  |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 5,205,380 |  | 4,214,783 |  |
Past Due | 88,537 |  | 50,904 |  |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 2,316,010 |  | 2,514,269 |  |
Past Due | 23,062 |  | 28,706 |  |
Nonaccruing | 22,411 |  | 25,563 |  |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 1,762,606 |  | 1,696,321 |  |
Past Due | 17,798 |  | 17,460 |  |
Nonaccruing | 2,943 |  | 2,969 |  |
PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccruing |  | $ 6,700 | 1,300 |  |
PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current | 240,995 |  |  |  |
PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Current |  |  | 268,280 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 109,742 |  | 76,187 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 42,716 |  | 24,747 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 3,146 |  | 516 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 20,389 |  | 14,200 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 861 |  | 91 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 18,269 |  | 9,655 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 51 |  | 285 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 67,026 |  | 51,440 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 977 |  | 581 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 45,839 |  | 28,239 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 9,729 |  | 12,585 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 10,481 |  | 10,035 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 13,764 |  |  |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due |  |  | 11,155 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 40,274 |  | 19,682 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 14,553 |  | 3,910 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 195 |  | 9 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 8,774 |  | 2,066 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 331 |  | 76 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 4,842 |  | 1,759 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 411 |  | 0 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 25,721 |  | 15,772 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 218 |  | 21 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 18,289 |  | 7,357 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 3,468 |  | 4,490 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 3,746 |  | 3,904 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 5,608 |  |  |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due |  |  | 7,708 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 56,519 |  | 39,013 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 16,877 |  | 6,962 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 2,702 |  | 444 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 8,319 |  | 3,237 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 698 |  | 300 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 5,032 |  | 2,892 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 126 |  | 89 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 39,642 |  | 32,051 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 1,797 |  | 1,591 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 24,409 |  | 15,308 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 9,865 |  | 11,631 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | 3,571 |  | 3,521 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due | $ 14,020 |  |  |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past Due |  |  | $ 22,761 |  |

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