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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 69,224 $ 76,231 $ 69,224 $ 76,231 $ 73,712
Loan balance 4,999,912   4,999,912   4,829,682
Accrued interest receivable 18,976   18,976   17,677
Recorded Investment 5,014,564   5,014,564   4,843,311
Impaired Financing Receivable, Average Recorded Investment 69,933 89,455 69,541 98,690  
Impaired Financing Receivable, Interest Income, Cash Basis Method 409 664 1,513 2,081  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 19,154 23,186 19,154 23,186  
Impaired Financing Receivable, Average Recorded Investment 19,793 18,764 19,056 19,362  
Impaired Financing Receivable, Interest Income, Cash Basis Method 35 68 306 204  
Construction Real Estate, SEPH Commercial Land and Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,045 2,097 2,045 2,097  
Loan balance [1] 2,069   2,069   2,195
Accrued interest receivable [1] 0   0   0
Recorded Investment [1] 2,069   2,069   2,195
Impaired Financing Receivable, Average Recorded Investment 2,068 3,653 2,073 4,130  
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 12 8 134  
Construction Real Estate - Remaining Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 5,993 5,970 5,993 5,970  
Loan balance 115,987   115,987   115,139
Accrued interest receivable 279   279   300
Recorded Investment 116,266   116,266   115,439
Impaired Financing Receivable, Average Recorded Investment 6,059 8,561 5,771 9,587  
Impaired Financing Receivable, Interest Income, Cash Basis Method 2 2 13 56  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 35,554   35,554   31,148
Accrued interest receivable 78   78   72
Recorded Investment 35,632   35,632   31,220
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 6,762   6,762   7,322
Accrued interest receivable 19   19   23
Recorded Investment 6,781   6,781   7,345
Residential Real Estate - Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 24,370 23,640 24,370 23,640  
Loan balance 412,294   412,294   417,612
Accrued interest receivable 883   883   1,038
Recorded Investment 413,177   413,177   418,650
Impaired Financing Receivable, Average Recorded Investment 24,560 27,765 24,784 29,632  
Impaired Financing Receivable, Interest Income, Cash Basis Method 240 255 768 825  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,216,221   1,216,221   1,189,709
Accrued interest receivable 1,840   1,840   1,548
Recorded Investment 1,218,061   1,218,061   1,191,257
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 213,488   213,488   216,915
Accrued interest receivable 755   755   803
Recorded Investment 214,243   214,243   217,718
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 24,297   24,297   27,139
Accrued interest receivable 79   79   97
Recorded Investment 24,376   24,376   27,236
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Accrued interest receivable 14,652   14,652   13,629
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance [1] 909,025   909,025   856,535
Accrued interest receivable [1] 3,478   3,478   3,218
Recorded Investment [1] 912,503   912,503   859,753
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 17,662 21,303 17,662 21,303  
Loan balance [1] 1,091,578   1,091,578   1,069,637
Accrued interest receivable [1] 4,239   4,239   3,546
Recorded Investment [1] 1,095,817   1,095,817   1,073,183
Impaired Financing Receivable, Average Recorded Investment 17,453 30,644 17,857 35,458  
Impaired Financing Receivable, Interest Income, Cash Basis Method 132 327 418 862  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment   35   35  
Loan balance 969,586   969,586   893,160
Accrued interest receivable 2,949   2,949   2,967
Recorded Investment 972,535   972,535   896,127
Impaired Financing Receivable, Average Recorded Investment   68   521  
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 $ 0 0 $ 0  
Leases [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 3,051   3,051   3,171
Accrued interest receivable 53   53   17
Recorded Investment $ 3,104   $ 3,104   $ 3,188
[1] Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.