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Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (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, Impaired [Line Items]          
Unpaid principal balance $ 70,991   $ 70,991   $ 66,585
Recorded investment 61,750 $ 73,144 61,750 $ 73,144 56,564
Allowance for loan losses allocated 1,396   1,396   684
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  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Impaired [Line Items]          
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  
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 29,897   29,897   19,899
Recorded investment 26,740   26,740   14,704
Allowance for loan losses allocated 0   0   0
Commercial Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 5,256   5,256   5,394
Recorded investment 3,203   3,203   3,335
Allowance for loan losses allocated 1,366   1,366   681
Construction Real Estate Commercial [Domain]          
Financing Receivable, Impaired [Line Items]          
Recorded investment 2,529 1,636 2,529 1,636  
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  
Construction Real Estate Commercial [Domain] | Financing Receivable With No Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 5,342   5,342   2,788
Recorded investment 2,529   2,529   1,324
Allowance for loan losses allocated 0   0   0
Residential Real Estate - Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment 2,750 21,235 2,750 21,235  
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 - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 3,080   3,080   19,346
Recorded investment 2,717   2,717   19,012
Allowance for loan losses allocated 0   0   0
Residential Real Estate - Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 33   33   47
Recorded investment 33   33   47
Allowance for loan losses allocated 3   3   1
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment 26,528 21,790 26,528 21,790  
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  
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 25,145   25,145   18,974
Recorded investment 24,469   24,469   18,060
Allowance for loan losses allocated 0   0   0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid principal balance 2,238   2,238   137
Recorded investment 2,059   2,059   82
Allowance for loan losses allocated $ 27   $ 27   $ 2
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment   8   8  
Impaired Financing Receivable, Average Recorded Investment   $ 9   $ 6