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Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 60,263   $ 66,585
Recorded investment 50,322 $ 70,127 56,564
Allowance for loan losses allocated 1,207   684
Impaired Financing Receivable, Average Recorded Investment 50,863 67,950  
Impaired Financing Receivable, Interest Income, Cash Basis Method 421 811  
Commercial Financial And Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 27,050 22,542  
Impaired Financing Receivable, Average Recorded Investment 20,078 19,471  
Impaired Financing Receivable, Interest Income, Cash Basis Method 174 220  
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 27,201   19,899
Recorded investment 22,255   14,704
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 7,082   5,394
Recorded investment 4,795   3,335
Allowance for loan losses allocated 1,165   681
Construction Real Estate Commercial [Domain]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 1,393 2,041  
Impaired Financing Receivable, Average Recorded Investment 1,377 2,096  
Impaired Financing Receivable, Interest Income, Cash Basis Method 14 15  
Construction Real Estate Commercial [Domain] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 1,264   2,788
Recorded investment 1,265   1,324
Allowance for loan losses allocated 0   0
Construction Real Estate Commercial [Domain] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 1,592    
Recorded investment 128    
Allowance for loan losses allocated 8    
Residential Real Estate - Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,896 22,803  
Impaired Financing Receivable, Average Recorded Investment 11,215 23,081  
Impaired Financing Receivable, Interest Income, Cash Basis Method 31 345  
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 3,107   19,346
Recorded investment 2,786   19,012
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 123   47
Recorded investment 110   47
Allowance for loan losses allocated 5   1
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 18,983 22,732  
Impaired Financing Receivable, Average Recorded Investment 18,193 23,297  
Impaired Financing Receivable, Interest Income, Cash Basis Method 202 231  
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 18,370   18,974
Recorded investment 17,901   18,060
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 1,524   137
Recorded investment 1,082   82
Allowance for loan losses allocated $ 29   $ 2
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment   9  
Impaired Financing Receivable, Average Recorded Investment   $ 5