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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | $ 28,322,780 |  | $ 24,916,700
Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 18,552,002 |  | 16,137,227
Commercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,013,454 |  | 757,854
Commercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [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 |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 542,028 |  | 426,985
Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 4,403,792 |  | 3,938,730
Commercial | Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 310,093 |  | 296,424
Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [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 |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 357,385 |  | 257,030
Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 5,293,917 |  | 4,265,687
Noncommercial | Revolving mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 2,339,072 |  | 2,542,975
Noncommercial | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,780,404 |  | 1,713,781
Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 28,116,245 |  | 24,781,818
Loans and leases, not acquired in a transfer accounted for as debt securities | 28,322,780 |  | 24,916,700
Total | 206,535 |  | 134,882
Nonaccruing | 114,946 |  | 84,546
Non-PCI Loans | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 18,477,856 |  | 16,101,608
Loans and leases, not acquired in a transfer accounted for as debt securities | 18,552,002 |  | 16,137,227
Total | 74,146 |  | 35,619
Nonaccruing | 42,407 |  | 18,529
Non-PCI Loans | Commercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 1,007,411 |  | 756,885
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,013,454 |  | 757,854
Total | 6,043 |  | 969
Nonaccruing | 4,281 |  | 666
Non-PCI Loans | Commercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 12,245,153 |  | 10,697,731
Loans and leases, not acquired in a transfer accounted for as debt securities | 12,282,635 |  | 10,717,234
Total | 37,482 |  | 19,503
Nonaccruing | 29,733 |  | 12,594
Non-PCI Loans | Commercial | Other commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 540,138 |  | 426,518
Loans and leases, not acquired in a transfer accounted for as debt securities | 542,028 |  | 426,985
Total | 1,890 |  | 467
Nonaccruing | 708 |  | 366
Non-PCI Loans | Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 4,375,649 |  | 3,924,424
Loans and leases, not acquired in a transfer accounted for as debt securities | 4,403,792 |  | 3,938,730
Total | 28,143 |  | 14,306
Nonaccruing | 7,365 |  | 4,624
Non-PCI Loans | Commercial | Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 309,505 |  | 296,050
Loans and leases, not acquired in a transfer accounted for as debt securities | 310,093 |  | 296,424
Total | 588 |  | 374
Nonaccruing | 320 |  | 279
Non-PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 9,638,389 |  | 8,680,210
Loans and leases, not acquired in a transfer accounted for as debt securities | 9,770,778 |  | 8,779,473
Total | 132,389 |  | 99,263
Nonaccruing | 72,539 |  | 66,017
Non-PCI Loans | Noncommercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 354,393 |  | 254,837
Loans and leases, not acquired in a transfer accounted for as debt securities | 357,385 |  | 257,030
Total | 2,992 |  | 2,193
Nonaccruing | 2,828 |  | 1,823
Non-PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 5,205,380 |  | 4,214,783
Loans and leases, not acquired in a transfer accounted for as debt securities | 5,293,917 |  | 4,265,687
Total | 88,537 |  | 50,904
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 2,316,010 |  | 2,514,269
Loans and leases, not acquired in a transfer accounted for as debt securities | 2,339,072 |  | 2,542,975
Total | 23,062 |  | 28,706
Nonaccruing | 22,411 |  | 25,563
Non-PCI Loans | Noncommercial | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 1,762,606 |  | 1,696,321
Loans and leases, not acquired in a transfer accounted for as debt securities | 1,780,404 |  | 1,713,781
Total | 17,798 |  | 17,460
Nonaccruing | 2,943 |  | 2,969
PCI Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccruing |  | $ 6,700 | 1,300
PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 240,995 |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 274,387 |  | 309,904
PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current |  |  | 268,280
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 109,742 |  | 76,187
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 42,716 |  | 24,747
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 3,146 |  | 516
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 20,389 |  | 14,200
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 861 |  | 91
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 18,269 |  | 9,655
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 51 |  | 285
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 67,026 |  | 51,440
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 977 |  | 581
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 45,839 |  | 28,239
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 9,729 |  | 12,585
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 10,481 |  | 10,035
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 13,764 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total |  |  | 11,155
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 40,274 |  | 19,682
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 14,553 |  | 3,910
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 195 |  | 9
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 8,774 |  | 2,066
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 331 |  | 76
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 4,842 |  | 1,759
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 411 |  | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 25,721 |  | 15,772
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 218 |  | 21
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 18,289 |  | 7,357
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 3,468 |  | 4,490
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 3,746 |  | 3,904
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 5,608 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total |  |  | 7,708
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 56,519 |  | 39,013
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 16,877 |  | 6,962
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 2,702 |  | 444
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 8,319 |  | 3,237
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 698 |  | 300
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 5,032 |  | 2,892
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 126 |  | 89
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 39,642 |  | 32,051
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 1,797 |  | 1,591
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 24,409 |  | 15,308
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 9,865 |  | 11,631
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 3,571 |  | 3,521
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | $ 14,020 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total |  |  | $ 22,761

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