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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
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