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Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans $ 102,625 $ 95,887
Accruing restructured loans 15,094 25,088
Loans past due 90 days or more and accruing 1,370 1,975
Total nonperforming loans 119,089 122,950
Commercial Financial And Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 27,813 21,676
Accruing restructured loans 797 8,947
Loans past due 90 days or more and accruing 8  
Total nonperforming loans 28,618 30,623
Construction Real Estate, SEPH Commercial Land and Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,043 2,044
Accruing restructured loans 0 0
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 2,043 2,044
Construction Real Estate - Remaining Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 4,336 4,162
Accruing restructured loans 509 514
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 4,845 4,676
Construction Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 6 7
Accruing restructured loans 108 110
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 114 117
Construction Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 21 64
Accruing restructured loans 108 114
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 129 178
Residential Real Estate - Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 24,365 25,063
Accruing restructured loans 254 261
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 24,619 25,324
Residential Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 20,889 20,378
Accruing restructured loans 9,691 10,143
Loans past due 90 days or more and accruing 536 851
Total nonperforming loans 31,116 31,372
Residential Real Estate - HELOC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,653 1,749
Accruing restructured loans 829 873
Loans past due 90 days or more and accruing 8 27
Total nonperforming loans 2,490 2,649
Residential Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,445 1,657
Accruing restructured loans 608 635
Loans past due 90 days or more and accruing 0 4
Total nonperforming loans 2,053 2,296
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 16,556 15,268
Accruing restructured loans 1,512 2,757
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 18,068 18,025
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 3,498 3,819
Accruing restructured loans 678 734
Loans past due 90 days or more and accruing 818 1,093
Total nonperforming loans $ 4,994 $ 5,646