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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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans $ 84,294 $ 87,822
Accruing restructured loans 21,223 18,228
Loans past due 90 days or more and accruing 1,886 2,138
Total nonperforming loans 107,403 108,188
Commercial Financial And Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 18,767 20,057
Accruing restructured loans 3,825 600
Loans past due 90 days or more and accruing 10 15
Total nonperforming loans 22,602 20,672
Construction Real Estate Commercial [Domain]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,649 1,833
Accruing restructured loans 392 393
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 2,041 2,226
Construction Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 0  
Accruing restructured loans 103 104
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 103 104
Construction Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 58 61
Accruing restructured loans 92 95
Loans past due 90 days or more and accruing 0 12
Total nonperforming loans 150 168
Residential Real Estate - Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 22,715 23,013
Accruing restructured loans 88 89
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 22,803 23,102
Residential Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 17,632 18,313
Accruing restructured loans 9,983 9,612
Loans past due 90 days or more and accruing 804 887
Total nonperforming loans 28,419 28,812
Residential Real Estate - HELOC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,683 1,783
Accruing restructured loans 849 673
Loans past due 90 days or more and accruing 26 25
Total nonperforming loans 2,558 2,481
Residential Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 577 644
Accruing restructured loans 630 609
Loans past due 90 days or more and accruing 0 60
Total nonperforming loans 1,207 1,313
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 18,474 19,169
Accruing restructured loans 4,258 5,305
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 22,732 24,474
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,739 2,949
Accruing restructured loans 1,003 748
Loans past due 90 days or more and accruing 1,046 1,139
Total nonperforming loans $ 4,788 $ 4,836