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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, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans $ 66,151 $ 72,056
Accruing restructured loans 18,757 20,177
Loans past due 90 days or more and accruing 1,406 1,845
Total nonperforming loans 86,314 94,078
Commercial Financial And Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 25,985 16,773
Accruing restructured loans 1,088 1,291
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 27,073 18,064
Construction Real Estate Commercial [Domain]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 960 986
Accruing restructured loans 433 338
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 1,393 1,324
Construction Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 0 8
Accruing restructured loans 16 92
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 16 100
Construction Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 43 52
Accruing restructured loans 6 0
Loans past due 90 days or more and accruing 0 0
Total nonperforming loans 49 52
Residential Real Estate - Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 2,674 18,835
Accruing restructured loans 222 224
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 2,896 19,059
Residential Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 16,856 16,841
Accruing restructured loans 10,022 10,766
Loans past due 90 days or more and accruing 669 568
Total nonperforming loans 27,547 28,175
Residential Real Estate - HELOC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 1,482 1,593
Accruing restructured loans 882 1,025
Loans past due 90 days or more and accruing 47 14
Total nonperforming loans 2,411 2,632
Residential Real Estate - Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 527 586
Accruing restructured loans 695 616
Loans past due 90 days or more and accruing 0 7
Total nonperforming loans 1,222 1,209
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 14,213 12,979
Accruing restructured loans 4,770 5,163
Loans past due 90 days or more and accruing 0  
Total nonperforming loans 18,983 18,142
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Nonaccrual loans 3,411 3,403
Accruing restructured loans 623 662
Loans past due 90 days or more and accruing 690 1,256
Total nonperforming loans $ 4,724 $ 5,321