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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 77,998 $ 69,224 $ 77,998 $ 69,224 $ 80,664
Loan balance 5,187,004   5,187,004   5,068,085
Accrued interest receivable 17,951   17,951   18,675
Recorded Investment 5,201,579   5,201,579   5,082,324
Impaired Financing Receivable, Average Recorded Investment 84,736 69,933 81,191 69,541  
Impaired Financing Receivable, Interest Income, Cash Basis Method 767 409 4,011 1,513  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 23,856 19,154 23,856 19,154  
Impaired Financing Receivable, Average Recorded Investment 26,679 19,793 28,217 19,056  
Impaired Financing Receivable, Interest Income, Cash Basis Method 194 35 740 306  
Construction Real Estate, SEPH Commercial Land and Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 1,700 2,045 1,700 2,045  
Loan balance [1] 1,700   1,700   2,044
Accrued interest receivable [1] 0   0   0
Recorded Investment [1] 1,700   1,700   2,044
Impaired Financing Receivable, Average Recorded Investment 1,700 2,068 1,906 2,073  
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 0 0 8  
Construction Real Estate - Remaining Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,677 5,993 2,677 5,993  
Loan balance 136,883   136,883   128,046
Accrued interest receivable 316   316   321
Recorded Investment 137,199   137,199   128,367
Impaired Financing Receivable, Average Recorded Investment 3,943 6,059 4,338 5,771  
Impaired Financing Receivable, Interest Income, Cash Basis Method 16 2 44 13  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 41,848   41,848   36,722
Accrued interest receivable 88   88   75
Recorded Investment 41,936   41,936   36,797
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 5,544   5,544   6,533
Accrued interest receivable 18   18   21
Recorded Investment 5,562   5,562   6,554
Residential Real Estate - Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 23,700 24,370 23,700 24,370  
Loan balance 408,372   408,372   410,571
Accrued interest receivable 925   925   1,014
Recorded Investment 409,297   409,297   411,585
Impaired Financing Receivable, Average Recorded Investment 24,422 24,560 24,618 24,784  
Impaired Financing Receivable, Interest Income, Cash Basis Method 314 240 2,619 768  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,189,232   1,189,232   1,210,819
Accrued interest receivable 1,382   1,382   1,469
Recorded Investment 1,190,614   1,190,614   1,212,288
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 212,968   212,968   211,415
Accrued interest receivable 788   788   769
Recorded Investment 213,756   213,756   212,184
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 19,481   19,481   22,638
Accrued interest receivable 65   65   78
Recorded Investment 19,546   19,546   22,716
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Accrued interest receivable 14,575   14,575   14,239
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance [1] 958,029   958,029   955,727
Accrued interest receivable [1] 3,786   3,786   3,437
Recorded Investment [1] 961,815   961,815   959,164
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 26,065 17,662 26,065 17,662  
Loan balance [1] 1,141,002   1,141,002   1,113,603
Accrued interest receivable [1] 4,268   4,268   4,009
Recorded Investment [1] 1,145,270   1,145,270   1,117,612
Impaired Financing Receivable, Average Recorded Investment 27,982 17,453 22,108 17,857  
Impaired Financing Receivable, Interest Income, Cash Basis Method 243 $ 132 608 $ 418  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,068,343   1,068,343   967,111
Accrued interest receivable 2,884   2,884   3,032
Recorded Investment 1,071,227   1,071,227   970,143
Impaired Financing Receivable, Average Recorded Investment 10   4    
Leases [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 3,602   3,602   2,856
Accrued interest receivable 55   55   14
Recorded Investment $ 3,657   $ 3,657   $ 2,870
[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.