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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 61,750 $ 73,144 $ 61,750 $ 73,144 $ 56,564
Loan balance 5,324,974   5,324,974   5,372,483
Accrued interest receivable 21,970   21,970   22,164
Recorded Investment 5,341,555   5,341,555   5,389,142
Impaired Financing Receivable, Average Recorded Investment 52,511 67,672 51,883 67,479  
Impaired Financing Receivable, Interest Income, Cash Basis Method 386 437 807 1,248  
Construction Real Estate Commercial [Domain]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,529 1,636 2,529 1,636  
Loan balance 136,058   136,058   125,389
Accrued interest receivable 423   423   401
Recorded Investment 136,481   136,481   125,790
Impaired Financing Receivable, Average Recorded Investment 1,510 1,843 1,451 1,960  
Impaired Financing Receivable, Interest Income, Cash Basis Method 13 16 27 31  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 29,943 28,475 29,943 28,475  
Impaired Financing Receivable, Average Recorded Investment 27,637 23,320 23,402 21,789  
Impaired Financing Receivable, Interest Income, Cash Basis Method 145 120 319 340  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 52,895   52,895   52,203
Accrued interest receivable 127   127   133
Recorded Investment 53,022   53,022   52,336
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 2,965   2,965   3,878
Accrued interest receivable 9   9   13
Recorded Investment 2,974   2,974   3,891
Residential Real Estate - Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,750 21,235 2,750 21,235  
Loan balance 390,651   390,651   393,094
Accrued interest receivable 1,069   1,069   1,029
Recorded Investment 391,720   391,720   394,123
Impaired Financing Receivable, Average Recorded Investment 2,653 20,732 7,511 21,220  
Impaired Financing Receivable, Interest Income, Cash Basis Method 27 61 58 406  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,094,657   1,094,657   1,110,426
Accrued interest receivable 1,358   1,358   1,516
Recorded Investment 1,096,015   1,096,015   1,111,942
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 188,663   188,663   203,178
Accrued interest receivable 921   921   974
Recorded Investment 189,584   189,584   204,152
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 16,601   16,601   18,526
Accrued interest receivable 47   47   53
Recorded Investment 16,648   16,648   18,579
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Accrued interest receivable 16,581   16,581   16,659
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance [1] 1,014,623   1,014,623   1,053,453
Accrued interest receivable [1] 4,766   4,766   4,413
Recorded Investment [1] 1,019,389   1,019,389   1,057,866
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 26,528 21,790 26,528 21,790  
Loan balance [1] 1,150,845   1,150,845   1,167,607
Accrued interest receivable [1] 4,241   4,241   4,283
Recorded Investment [1] 1,155,086   1,155,086   1,171,890
Impaired Financing Receivable, Average Recorded Investment 20,711 21,768 19,519 22,504  
Impaired Financing Receivable, Interest Income, Cash Basis Method 201 240 403 471  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment   8   8  
Loan balance 1,274,349   1,274,349   1,241,736
Accrued interest receivable 3,597   3,597   3,808
Recorded Investment 1,277,946   1,277,946   1,245,544
Impaired Financing Receivable, Average Recorded Investment   $ 9   $ 6  
Leases [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 2,667   2,667   2,993
Accrued interest receivable 23   23   36
Recorded Investment $ 2,690   $ 2,690   $ 3,029
[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.