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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment $ 70,127 $ 78,171 $ 70,426
Loan balance 5,313,641   5,271,857
Accrued interest receivable 18,628   18,822
Recorded Investment 5,328,090   5,286,830
Impaired Financing Receivable, Average Recorded Investment 67,950 78,669  
Impaired Financing Receivable, Interest Income, Cash Basis Method 811 2,396  
Construction Real Estate Commercial [Domain]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 2,041 6,888  
Loan balance 112,015   135,343
Accrued interest receivable 338   398
Recorded Investment 112,353   135,741
Impaired Financing Receivable, Average Recorded Investment 2,096 6,814  
Impaired Financing Receivable, Interest Income, Cash Basis Method 15 13  
Commercial Financial And Agricultural [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 22,542 28,596  
Impaired Financing Receivable, Average Recorded Investment 19,471 29,858  
Impaired Financing Receivable, Interest Income, Cash Basis Method 220 238  
Construction Real Estate - Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 48,193   48,699
Accrued interest receivable 110   106
Recorded Investment 48,303   48,805
Construction Real Estate - Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 5,026   4,903
Accrued interest receivable 14   17
Recorded Investment 5,040   4,920
Residential Real Estate - Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 22,803 24,619  
Loan balance 396,663   406,687
Accrued interest receivable 924   940
Recorded Investment 397,587   407,627
Impaired Financing Receivable, Average Recorded Investment 23,081 24,897  
Impaired Financing Receivable, Interest Income, Cash Basis Method 345 1,965  
Residential Real Estate - Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 1,156,543   1,169,495
Accrued interest receivable 1,246   1,459
Recorded Investment 1,157,789   1,170,954
Residential Real Estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 211,311   212,441
Accrued interest receivable 820   853
Recorded Investment 212,131   213,294
Residential Real Estate - Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 18,734   19,874
Accrued interest receivable 53   67
Recorded Investment 18,787   19,941
Loans Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Accrued interest receivable 14,449   14,973
Commercial Financial And Agricultural [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance [1] 995,377   994,619
Accrued interest receivable [1] 3,898   3,558
Recorded Investment [1] 999,275   998,177
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 22,732 18,068  
Loan balance [1] 1,187,395   1,155,703
Accrued interest receivable [1] 3,870   4,161
Recorded Investment [1] 1,191,265   1,159,864
Impaired Financing Receivable, Average Recorded Investment 23,297 17,100  
Impaired Financing Receivable, Interest Income, Cash Basis Method 231 $ 180  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 9    
Loan balance 1,178,736   1,120,850
Accrued interest receivable 3,118   3,385
Recorded Investment 1,181,854   1,124,235
Impaired Financing Receivable, Average Recorded Investment 5    
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 3,648   3,243
Accrued interest receivable 58   29
Recorded Investment $ 3,706   $ 3,272
[1] Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.