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Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 11,322 $ 10,451
Nonaccrual and accruing restructured loans 146,070 154,025
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 105,873 112,315
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 40,197 41,710
Partial Charge-Offs On Impaired Loans 54,400 63,300
Commercial Financial And Agricultural [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 19,847 20,740
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 19,835 20,727
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 12 13
Construction Real Estate - SEPH Commercial Land And Development [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 4,102 4,777
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 4,102 4,777
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment      
Construction Real Estate - Remaining Commercial [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 10,530 10,782
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 10,530 10,782
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 0 0
Construction Real Estate - Mortgage [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 195 184
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 0 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 195 184
Construction Real Estate - Installment [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 196 231
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 0 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 196 231
Residential Real Estate - Commercial [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 31,213 33,408
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 31,213 33,408
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 0 0
Residential Real Estate - Mortgage [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 31,494 32,272
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 0 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 31,494 32,272
Residential Real Estate - HELOC [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 2,625 2,880
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 0 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 2,625 2,880
Residential Real Estate - Installment [Member]
    
Financing Receivable, Impaired [Line Items]    
Nonaccrual and accruing restructured loans 1,890 1,850
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 0 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 1,890 1,850
Commercial Real Estate [Member]
    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 5,514 5,496
Nonaccrual and accruing restructured loans 39,395 41,822
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 39,395 41,822
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 0 0
Consumer [Member]
    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0
Nonaccrual and accruing restructured loans 4,583 5,079
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment 798 799
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment 3,785 4,280
Financing Receivable With No Related Allowance Recorded [Member]
    
Financing Receivable, Impaired [Line Items]    
Partial Charge-Offs On Impaired Loans $ 49,200 $ 58,100