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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | $ 24,916,700,000 | $ 22,833,827,000
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 16,137,227,000 | 14,799,054,000
Commercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 757,854,000 | 669,215,000
Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 10,717,234,000 | 9,729,022,000
Commercial | Other commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 426,985,000 | 473,433,000
Commercial | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 3,938,730,000 | 3,625,208,000
Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 296,424,000 | 302,176,000
Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 8,779,473,000 | 8,034,773,000
Noncommercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 257,030,000 | 248,289,000
Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 4,265,687,000 | 3,523,786,000
Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 2,542,975,000 | 2,701,525,000
Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-PCI Loans | 1,713,781,000 | 1,561,173,000
Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 24,781,818,000 | 22,688,955,000
Total | 134,882,000 | 144,872,000
Nonaccruing | 84,546,000 | 92,534,000
Non-PCI Loans | 24,916,700,000 | 22,833,827,000
Non-PCI Loans | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 16,101,608,000 | 14,762,509,000
Non-PCI Loans | 16,137,227,000 | 14,799,054,000
Non-PCI Loans | Commercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 756,885,000 | 667,925,000
Total | 969,000 | 1,290,000
Nonaccruing | 666,000 | 1,040,000
Non-PCI Loans | 757,854,000 | 669,215,000
Non-PCI Loans | Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 10,697,731,000 | 9,707,869,000
Total | 19,503,000 | 21,153,000
Nonaccruing | 12,594,000 | 22,625,000
Non-PCI Loans | 10,717,234,000 | 9,729,022,000
Non-PCI Loans | Commercial | Other commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 426,518,000 | 473,251,000
Total | 467,000 | 182,000
Nonaccruing | 366,000 | 916,000
Non-PCI Loans | 426,985,000 | 473,433,000
Non-PCI Loans | Commercial | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 3,924,424,000 | 3,611,615,000
Total | 14,306,000 | 13,593,000
Nonaccruing | 4,624,000 | 4,876,000
Non-PCI Loans | 3,938,730,000 | 3,625,208,000
Non-PCI Loans | Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 296,050,000 | 301,849,000
Total | 374,000 | 327,000
Non-PCI Loans | 296,424,000 | 302,176,000
Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 8,680,210,000 | 7,926,446,000
Total | 99,263,000 | 108,327,000
Non-PCI Loans | 8,779,473,000 | 8,034,773,000
Non-PCI Loans | Noncommercial | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 254,837,000 | 239,648,000
Total | 2,193,000 | 8,641,000
Nonaccruing | 1,823,000 | 1,989,000
Non-PCI Loans | 257,030,000 | 248,289,000
Non-PCI Loans | Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 4,214,783,000 | 3,465,935,000
Total | 50,904,000 | 57,851,000
Nonaccruing | 35,662,000 | 38,942,000
Non-PCI Loans | 4,265,687,000 | 3,523,786,000
Non-PCI Loans | Noncommercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccruing | 279,000 | 164,000
Non-PCI Loans | Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,514,269,000 | 2,674,390,000
Total | 28,706,000 | 27,135,000
Nonaccruing | 25,563,000 | 19,990,000
Non-PCI Loans | 2,542,975,000 | 2,701,525,000
Non-PCI Loans | Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,696,321,000 | 1,546,473,000
Total | 17,460,000 | 14,700,000
Nonaccruing | 2,969,000 | 1,992,000
Non-PCI Loans | 1,713,781,000 | 1,561,173,000
PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccruing | 1,300,000 | 624,000
PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 268,280,000 | 318,632,000
Non-PCI Loans | 309,904,000 | 369,579,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 76,187,000 | 80,031,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 24,747,000 | 22,751,000
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 | 516,000 | 491,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 14,200,000 | 12,288,000
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 | 91,000 | 107,000
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 | 9,655,000 | 9,677,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 285,000 | 188,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 51,440,000 | 57,280,000
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 | 581,000 | 7,154,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 28,239,000 | 27,886,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 12,585,000 | 13,428,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 10,035,000 | 8,812,000
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 11,155,000 | 13,343,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 19,682,000 | 19,050,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 3,910,000 | 4,500,000
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 | 9,000 | 442,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 2,066,000 | 2,375,000
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 | 76,000 | 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 | 1,759,000 | 1,677,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 0 | 6,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 15,772,000 | 14,550,000
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 | 21,000 | 108,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 7,357,000 | 8,064,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 4,490,000 | 3,485,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 3,904,000 | 2,893,000
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 7,708,000 | 6,212,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 39,013,000 | 45,791,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 6,962,000 | 9,294,000
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 | 444,000 | 357,000
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 | 3,237,000 | 6,490,000
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 | 300,000 | 75,000
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 | 2,892,000 | 2,239,000
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 | 89,000 | 133,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | 32,051,000 | 36,497,000
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 | 1,591,000 | 1,379,000
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 | 15,308,000 | 21,901,000
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 | 11,631,000 | 10,222,000
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 | 3,521,000 | 2,995,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | $ 22,761,000 | $ 31,392,000

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