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Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans $ 111,429 $ 95,887
Accruing restructured loans 17,778 25,088
Loans past due 90 days or more and accruing 2,356 1,975
Total nonperforming loans 131,563 122,950
Commercial Financial And Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 29,159 21,676
Accruing restructured loans 664 8,947
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 29,823 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 3,962 4,162
Accruing restructured loans 424 514
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 4,386 4,676
Construction Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 0 7
Accruing restructured loans 107 110
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 107 117
Construction Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 51 64
Accruing restructured loans 107 114
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 158 178
Residential Real Estate - Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 25,070 25,063
Accruing restructured loans 0 261
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 25,070 25,324
Residential Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 21,695 20,378
Accruing restructured loans 9,348 10,143
Loans past due 90 days or more and accruing 1,200 851
Total nonperforming loans 32,243 31,372
Residential Real Estate - HELOC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,738 1,749
Accruing restructured loans 726 873
Loans past due 90 days or more and accruing 233 27
Total nonperforming loans 2,697 2,649
Residential Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 634 1,657
Accruing restructured loans 607 635
Loans past due 90 days or more and accruing 152 4
Total nonperforming loans 1,393 2,296
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 24,845 15,268
Accruing restructured loans 5,044 2,757
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 29,889 18,025
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,575 3,819
Accruing restructured loans 751 734
Loans past due 90 days or more and accruing 771 1,093
Total nonperforming loans $ 4,097 $ 5,646