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Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 18,786,285 $ 16,752,151 $ 16,070,821
Total Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 14,090,299 12,545,507  
Residential Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,596,692 2,146,713 2,037,162
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,099,294 2,059,931 2,061,005
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,511,808 2,013,890 1,990,309
Construction and Land Development [Member] | Total Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,373,048 1,010,879 946,592
Total Commercial & Industrial [Member] | Total Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 10,205,443 9,520,738 9,035,753
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 8,129,429 7,613,917 7,133,928
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 2,076,014 $ 1,906,821 $ 1,901,825