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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 90,844 $ 70,596 $ 90,844 $ 70,596 $ 80,664
Loan balance 5,127,644   5,127,644   5,068,085
Accrued interest receivable 17,497   17,497   18,675
Recorded Investment 5,141,660   5,141,660   5,082,324
Impaired Financing Receivable, Average Recorded Investment 81,825 67,192 80,544 69,468  
Impaired Financing Receivable, Interest Income, Cash Basis Method 848 542 3,244 1,104  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 29,779 20,429 29,779 20,429  
Impaired Financing Receivable, Average Recorded Investment 28,600 18,220 29,319 18,830  
Impaired Financing Receivable, Interest Income, Cash Basis Method 308 140 546 271  
Construction Real Estate, SEPH Commercial Land and Development [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 1,700 2,047 1,700 2,047  
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 1,957 2,068 1,994 2,072  
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 4,386 6,032 4,386 6,032  
Loan balance 127,108   127,108   128,046
Accrued interest receivable 299   299   321
Recorded Investment 127,407   127,407   128,367
Impaired Financing Receivable, Average Recorded Investment 4,438 5,611 4,570 5,644  
Impaired Financing Receivable, Interest Income, Cash Basis Method 15 6 28 11  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 38,260   38,260   36,722
Accrued interest receivable 70   70   75
Recorded Investment 38,330   38,330   36,797
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 5,756   5,756   6,533
Accrued interest receivable 20   20   21
Recorded Investment 5,776   5,776   6,554
Residential Real Estate - Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 25,070 24,441 25,070 24,441  
Loan balance 409,361   409,361   410,571
Accrued interest receivable 931   931   1,014
Recorded Investment 410,292   410,292   411,585
Impaired Financing Receivable, Average Recorded Investment 24,648 24,443 24,795 24,864  
Impaired Financing Receivable, Interest Income, Cash Basis Method 340 273 2,305 528  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,197,704   1,197,704   1,210,819
Accrued interest receivable 1,701   1,701   1,469
Recorded Investment 1,199,405   1,199,405   1,212,288
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 213,390   213,390   211,415
Accrued interest receivable 791   791   769
Recorded Investment 214,181   214,181   212,184
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 19,768   19,768   22,638
Accrued interest receivable 70   70   78
Recorded Investment 19,838   19,838   22,716
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Accrued interest receivable 14,016   14,016   14,239
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance [1] 964,072   964,072   955,727
Accrued interest receivable [1] 3,503   3,503   3,437
Recorded Investment [1] 967,575   967,575   959,164
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 29,889 17,647 29,889 17,647  
Loan balance [1] 1,131,067   1,131,067   1,113,603
Accrued interest receivable [1] 3,622   3,622   4,009
Recorded Investment [1] 1,134,689   1,134,689   1,117,612
Impaired Financing Receivable, Average Recorded Investment 22,177 16,850 19,863 18,058  
Impaired Financing Receivable, Interest Income, Cash Basis Method 185 $ 123 365 $ 286  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 20   20    
Loan balance 1,015,809   1,015,809   967,111
Accrued interest receivable 2,979   2,979   3,032
Recorded Investment 1,018,788   1,018,788   970,143
Impaired Financing Receivable, Average Recorded Investment 5   3    
Leases [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 3,649   3,649   2,856
Accrued interest receivable 30   30   14
Recorded Investment $ 3,679   $ 3,679   $ 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.