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Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 61,838   $ 59,381
Recorded investment 50,907 $ 50,322 48,144
Allowance for loan losses allocated 2,468   2,273
Impaired Financing Receivable, Average Recorded Investment 48,602 50,863  
Impaired Financing Receivable, Interest Income, Cash Basis Method 350 421  
Commercial Financial And Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 14,844 27,050  
Impaired Financing Receivable, Average Recorded Investment 14,924 20,078  
Impaired Financing Receivable, Interest Income, Cash Basis Method 47 174  
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 4,221   8,999
Recorded investment 3,488   3,713
Allowance for loan losses allocated 0   0
Commercial Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 18,238   13,736
Recorded investment 11,356   11,407
Allowance for loan losses allocated 2,403   2,169
Construction Real Estate Commercial [Domain]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,879 1,393  
Impaired Financing Receivable, Average Recorded Investment 2,239 1,377  
Impaired Financing Receivable, Interest Income, Cash Basis Method 12 14  
Construction Real Estate Commercial [Domain] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 5,693   4,679
Recorded investment 2,879   1,866
Allowance for loan losses allocated 0   0
Residential Real Estate Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,046 2,896  
Impaired Financing Receivable, Average Recorded Investment 2,588 11,215  
Impaired Financing Receivable, Interest Income, Cash Basis Method 20 31  
Residential Real Estate Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 2,048   2,691
Recorded investment 1,993   2,374
Allowance for loan losses allocated 0   0
Residential Real Estate Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 53   358
Recorded investment 53   358
Allowance for loan losses allocated 7   18
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 31,138 18,983  
Impaired Financing Receivable, Average Recorded Investment 28,851 18,193  
Impaired Financing Receivable, Interest Income, Cash Basis Method 271 $ 202  
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 29,876   26,663
Recorded investment 29,429   26,213
Allowance for loan losses allocated 0   0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 1,709   2,255
Recorded investment 1,709   2,213
Allowance for loan losses allocated $ 58   $ 86