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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, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | $ 22,833,827 | $ 20,928,709
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 14,799,054 | 13,760,703
Commercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 669,215 | 649,157
Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 9,729,022 | 9,026,220
Commercial | Other commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 473,433 | 351,291
Commercial | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 2,730,407 | 2,567,501
Commercial | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 894,801 | 826,270
Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 302,176 | 340,264
Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 8,034,773 | 7,168,006
Noncommercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 248,289 | 231,400
Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 3,523,786 | 2,889,124
Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 2,701,525 | 2,601,344
Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 1,561,173 | 1,446,138
Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 144,872 | 129,252
Current | 22,688,955 | 20,799,457
Non-PCI Loans | 22,833,827 | 20,928,709
Non-PCI Loans | Commercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 1,290 | 2,170
Current | 667,925 | 646,987
Non-PCI Loans | 669,215 | 649,157
Non-PCI Loans | Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 21,153 | 24,694
Current | 9,707,869 | 9,001,526
Non-PCI Loans | 9,729,022 | 9,026,220
Non-PCI Loans | Commercial | Other commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 182 | 310
Current | 473,251 | 350,981
Non-PCI Loans | 473,433 | 351,291
Non-PCI Loans | Commercial | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 9,470 | 11,071
Current | 2,720,937 | 2,556,430
Non-PCI Loans | 2,730,407 | 2,567,501
Non-PCI Loans | Commercial | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 4,123 | 2,482
Current | 890,678 | 823,788
Non-PCI Loans | 894,801 | 826,270
Non-PCI Loans | Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 327 | 270
Current | 301,849 | 339,994
Non-PCI Loans | 302,176 | 340,264
Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 7,926,446 | 7,079,751
Non-PCI Loans | 8,034,773 | 7,168,006
Non-PCI Loans | Noncommercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 8,641 | 2,294
Current | 239,648 | 229,106
Non-PCI Loans | 248,289 | 231,400
Non-PCI Loans | Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 57,851 | 50,079
Current | 3,465,935 | 2,839,045
Non-PCI Loans | 3,523,786 | 2,889,124
Non-PCI Loans | Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 27,135 | 24,402
Current | 2,674,390 | 2,576,942
Non-PCI Loans | 2,701,525 | 2,601,344
Non-PCI Loans | Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 14,700 | 11,480
Current | 1,546,473 | 1,434,658
Non-PCI Loans | 1,561,173 | 1,446,138
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 80,031 | 72,876
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 | 491 | 1,845
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 12,288 | 11,592
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 | 107 | 310
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 | 6,694 | 7,918
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 2,983 | 1,175
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 188 | 72
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 57,280 | 49,964
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 | 7,154 | 1,139
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 27,886 | 27,760
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 13,428 | 14,290
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 8,812 | 6,775
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 19,050 | 18,472
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 | 442 | 39
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 2,375 | 2,773
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 | 0 | 0
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 | 1,510 | 2,102
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 167 | 444
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 6 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 14,550 | 13,114
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 | 108 | 598
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 8,064 | 7,039
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 3,485 | 2,698
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 2,893 | 2,779
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 45,791 | 37,904
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 | 357 | 286
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 | 6,490 | 10,329
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 | 75 | 0
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 | 1,266 | 1,051
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 973 | 863
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 | 133 | 198
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 36,497 | 25,177
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 | 1,379 | 557
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 | 21,901 | 15,280
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 | 10,222 | 7,414
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 | $ 2,995 | $ 1,926

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