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Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 106,539   $ 109,305
Recorded investment 78,171 $ 70,492 80,664
Allowance for loan losses allocated 4,930   4,191
Impaired Financing Receivable, Average Recorded Investment 78,669 72,000  
Impaired Financing Receivable, Interest Income, Cash Basis Method 2,396 562  
Commercial Financial And Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 28,596 20,571  
Impaired Financing Receivable, Average Recorded Investment 29,858 19,876  
Impaired Financing Receivable, Interest Income, Cash Basis Method 238 131  
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 37,013   32,583
Recorded investment 23,192   18,763
Allowance for loan losses allocated 0   0
Commercial Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 9,496   16,155
Recorded investment 5,404   11,832
Allowance for loan losses allocated 2,471   1,904
Construction Real Estate, SEPH Commercial Land and Development [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,043 2,077  
Impaired Financing Receivable, Average Recorded Investment 2,043 2,077  
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 8  
Construction Real Estate, SEPH Commercial Land and Development [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 10,832   10,834
Recorded investment 2,043   2,044
Allowance for loan losses allocated 0   0
Construction Real Estate - Remaining Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 4,845 5,725  
Impaired Financing Receivable, Average Recorded Investment 4,771 5,697  
Impaired Financing Receivable, Interest Income, Cash Basis Method 13 5  
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 2,474   2,506
Recorded investment 1,497   1,531
Allowance for loan losses allocated 0   0
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 3,348   3,145
Recorded investment 3,348   3,145
Allowance for loan losses allocated 1,456   1,356
Residential Real Estate - Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 24,619 25,219  
Impaired Financing Receivable, Average Recorded Investment 24,897 25,373  
Impaired Financing Receivable, Interest Income, Cash Basis Method 1,965 255  
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 22,932   23,798
Recorded investment 22,806   23,480
Allowance for loan losses allocated 0   0
Residential Real Estate - Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 2,155   1,951
Recorded investment 1,813   1,844
Allowance for loan losses allocated 410   550
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment 18,068 16,900  
Impaired Financing Receivable, Average Recorded Investment 17,100 18,977  
Impaired Financing Receivable, Interest Income, Cash Basis Method 180 $ 163  
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 15,369   15,138
Recorded investment 15,148   14,916
Allowance for loan losses allocated 0   0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 2,920   3,195
Recorded investment 2,920   3,109
Allowance for loan losses allocated $ 593   $ 381