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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