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Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans $ 97,832 $ 95,887
Accruing restructured loans 17,403 25,088
Loans past due 90 days or more and accruing 1,723 1,975
Total nonperforming loans 116,958 122,950
Commercial Financial And Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 22,951 21,676
Accruing restructured loans 953 8,947
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 23,904 30,623
Construction Real Estate, SEPH Commercial Land and Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,700 2,044
Accruing restructured loans 0 0
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 1,700 2,044
Construction Real Estate - Remaining Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,257 4,162
Accruing restructured loans 420 514
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 2,677 4,676
Construction Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 0 7
Accruing restructured loans 105 110
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 105 117
Construction Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 46 64
Accruing restructured loans 96 114
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 142 178
Residential Real Estate - Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 23,700 25,063
Accruing restructured loans 0 261
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 23,700 25,324
Residential Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 19,768 20,378
Accruing restructured loans 9,570 10,143
Loans past due 90 days or more and accruing 750 851
Total nonperforming loans 30,088 31,372
Residential Real Estate - HELOC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,111 1,749
Accruing restructured loans 629 873
Loans past due 90 days or more and accruing 51 27
Total nonperforming loans 2,791 2,649
Residential Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 589 1,657
Accruing restructured loans 609 635
Loans past due 90 days or more and accruing 25 4
Total nonperforming loans 1,223 2,296
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 21,760 15,268
Accruing restructured loans 4,305 2,757
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 26,065 18,025
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,950 3,819
Accruing restructured loans 716 734
Loans past due 90 days or more and accruing 897 1,093
Total nonperforming loans $ 4,563 $ 5,646