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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 46,760 $ 73,609 $ 46,760 $ 73,609 $ 56,564
Nonaccrual loans 66,654   66,654   72,056
Accruing restructured loans 14,707   14,707   20,177
Loans past due 90 days or more and accruing 2,083   2,083   1,845
Total nonperforming loans 83,444   83,444   94,078
Impaired Financing Receivable, Average Recorded Investment 54,679 72,580 52,015 68,953  
Impaired Financing Receivable, Interest Income, Cash Basis Method 485 654 1,292 1,902  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 16,026 29,848 16,026 29,848  
Nonaccrual loans 15,837   15,837   16,773
Accruing restructured loans 264   264   1,291
Loans past due 90 days or more and accruing 16   16    
Total nonperforming loans 16,117   16,117   18,064
Impaired Financing Receivable, Average Recorded Investment 23,247 28,412 22,686 23,770  
Impaired Financing Receivable, Interest Income, Cash Basis Method 187 398 506 738  
Construction Real Estate Commercial [Domain]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,016 1,460 2,016 1,460  
Nonaccrual loans 2,016   2,016   986
Accruing restructured loans 0   0   338
Loans past due 90 days or more and accruing 0   0   0
Total nonperforming loans 2,016   2,016   1,324
Impaired Financing Receivable, Average Recorded Investment 2,246 1,554 1,661 1,830  
Impaired Financing Receivable, Interest Income, Cash Basis Method 4 18 31 49  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 16   16   8
Accruing restructured loans 16   16   92
Loans past due 90 days or more and accruing 0   0   0
Total nonperforming loans 32   32   100
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 21   21   52
Accruing restructured loans 12   12   0
Loans past due 90 days or more and accruing 0   0   0
Total nonperforming loans 33   33   52
Residential Real Estate Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,913 19,298 2,913 19,298  
Nonaccrual loans 2,786   2,786   18,835
Accruing restructured loans 127   127   224
Loans past due 90 days or more and accruing 0   0    
Total nonperforming loans 2,913   2,913   19,059
Impaired Financing Receivable, Average Recorded Investment 2,758 20,365 6,086 20,876  
Impaired Financing Receivable, Interest Income, Cash Basis Method 26 46 84 452  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 17,411   17,411   16,841
Accruing restructured loans 8,175   8,175   10,766
Loans past due 90 days or more and accruing 720   720   568
Total nonperforming loans 26,306   26,306   28,175
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 1,901   1,901   1,593
Accruing restructured loans 1,251   1,251   1,025
Loans past due 90 days or more and accruing 144   144   14
Total nonperforming loans 3,296   3,296   2,632
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccrual loans 410   410   586
Accruing restructured loans 1,074   1,074   616
Loans past due 90 days or more and accruing 0   0   7
Total nonperforming loans 1,484   1,484   1,209
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 25,805 22,995 25,805 22,995  
Nonaccrual loans 22,806   22,806   12,979
Accruing restructured loans 2,999   2,999   5,163
Loans past due 90 days or more and accruing 0   0    
Total nonperforming loans 25,805   25,805   18,142
Impaired Financing Receivable, Average Recorded Investment 26,428 22,241 21,582 22,470  
Impaired Financing Receivable, Interest Income, Cash Basis Method 268 192 671 663  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment   8   8  
Nonaccrual loans 3,450   3,450   3,403
Accruing restructured loans 789   789   662
Loans past due 90 days or more and accruing 1,203   1,203   1,256
Total nonperforming loans $ 5,442   $ 5,442   $ 5,321
Impaired Financing Receivable, Average Recorded Investment   $ 8   $ 7