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Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 171,934 $ 149,880
Commercial and industrial 13,451,886 13,211,481
Leasing 422,969 441,666
Owner occupied 6,961,807 7,150,028
Municipal 778,335 675,839
Construction and land development 2,018,655 1,841,502
Term 9,322,138 8,514,401
Loans Receivable, Gross, Commercial, Real Estate 11,340,793 10,355,903
Home equity credit line 2,645,192 2,416,357
1-4 family residential 5,890,714 5,382,099
Construction and other consumer real estate 486,712 385,240
Bankcard and other revolving plans 481,063 443,780
Other 189,794 187,149
Loans and Leases Receivable, Gross 42,649,265 40,649,542
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable before Fees, Gross 21,614,997 21,479,014
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable before Fees, Gross $ 9,693,475 $ 8,814,625