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Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (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
Nonaccrual loans 81,124   81,124   72,056
Accruing restructured loans 16,400   16,400   20,177
Loans past due 90 days or more and accruing 1,478   1,478   1,845
Total nonperforming loans 99,002   99,002   94,078
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, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 29,943 28,475 29,943 28,475  
Nonaccrual loans 29,847   29,847   16,773
Accruing restructured loans 187   187   1,291
Loans past due 90 days or more and accruing 6   6    
Total nonperforming loans 30,040   30,040   18,064
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 Commercial [Domain]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,529 1,636 2,529 1,636  
Nonaccrual loans 2,187   2,187   986
Accruing restructured loans 342   342   338
Loans past due 90 days or more and accruing 0   0   0
Total nonperforming loans 2,529   2,529   1,324
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 - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 0   0   8
Accruing restructured loans 16   16   92
Loans past due 90 days or more and accruing 0   0   0
Total nonperforming loans 16   16   100
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 42   42   52
Accruing restructured loans 15   15   0
Loans past due 90 days or more and accruing 0   0   0
Total nonperforming loans 57   57   52
Residential Real Estate - Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,750 21,235 2,750 21,235  
Nonaccrual loans 2,531   2,531   18,835
Accruing restructured loans 219   219   224
Loans past due 90 days or more and accruing 0   0    
Total nonperforming loans 2,750   2,750   19,059
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]          
Nonaccrual loans 17,508   17,508   16,841
Accruing restructured loans 9,644   9,644   10,766
Loans past due 90 days or more and accruing 399   399   568
Total nonperforming loans 27,551   27,551   28,175
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 1,772   1,772   1,593
Accruing restructured loans 1,230   1,230   1,025
Loans past due 90 days or more and accruing 60   60   14
Total nonperforming loans 3,062   3,062   2,632
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 464   464   586
Accruing restructured loans 808   808   616
Loans past due 90 days or more and accruing 103   103   7
Total nonperforming loans 1,375   1,375   1,209
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 26,528 21,790 26,528 21,790  
Nonaccrual loans 23,313   23,313   12,979
Accruing restructured loans 3,215   3,215   5,163
Loans past due 90 days or more and accruing 0   0    
Total nonperforming loans 26,528   26,528   18,142
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  
Nonaccrual loans 3,460   3,460   3,403
Accruing restructured loans 724   724   662
Loans past due 90 days or more and accruing 910   910   1,256
Total nonperforming loans $ 5,094   $ 5,094   $ 5,321
Impaired Financing Receivable, Average Recorded Investment   $ 9   $ 6