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Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 93,831   $ 95,358
Recorded investment 70,127 $ 78,171 70,426
Allowance for loan losses allocated 1,091   548
Impaired Financing Receivable, Average Recorded Investment 67,950 78,669  
Impaired Financing Receivable, Interest Income, Cash Basis Method 811 2,396  
Commercial Financial And Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 22,542 28,596  
Impaired Financing Receivable, Average Recorded Investment 19,471 29,858  
Impaired Financing Receivable, Interest Income, Cash Basis Method 220 238  
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 37,260   41,075
Recorded investment 21,001   19,965
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 6,419   810
Recorded investment 1,541   659
Allowance for loan losses allocated 596   152
Construction Real Estate Commercial [Domain]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,041 6,888  
Impaired Financing Receivable, Average Recorded Investment 2,096 6,814  
Impaired Financing Receivable, Interest Income, Cash Basis Method 15 13  
Construction Real Estate Commercial [Domain] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 1,499   3,662
Recorded investment 1,471   2,226
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 1,956    
Recorded investment 570    
Allowance for loan losses allocated 32    
Residential Real Estate - Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 22,803 24,619  
Impaired Financing Receivable, Average Recorded Investment 23,081 24,897  
Impaired Financing Receivable, Interest Income, Cash Basis Method 345 1,965  
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 22,924   24,409
Recorded investment 22,302   22,687
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 516   427
Recorded investment 501   415
Allowance for loan losses allocated 275   87
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 22,732 18,068  
Impaired Financing Receivable, Average Recorded Investment 23,297 17,100  
Impaired Financing Receivable, Interest Income, Cash Basis Method 231 $ 180  
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 22,553   23,961
Recorded investment 22,094   23,474
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 695   1,014
Recorded investment 638   1,000
Allowance for loan losses allocated 179   $ 309
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 9    
Impaired Financing Receivable, Average Recorded Investment 5    
Consumer [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 9    
Recorded investment 9    
Allowance for loan losses allocated $ 9