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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment $ 78,171 $ 70,492 $ 80,664
Loan balance 5,062,185   5,068,085
Accrued interest receivable 17,415   18,675
Recorded Investment 5,076,385   5,082,324
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, Recorded Investment [Line Items]      
Impaired Financing Receivable, 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  
Construction Real Estate, SEPH Commercial Land and Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 2,043 2,077  
Loan balance [1] 2,043   2,044
Accrued interest receivable [1] 0   0
Recorded Investment [1] 2,043   2,044
Impaired Financing Receivable, Average Recorded Investment 2,043 2,077  
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 8  
Construction Real Estate - Remaining Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 4,845 5,725  
Loan balance 129,167   128,046
Accrued interest receivable 321   321
Recorded Investment 129,488   128,367
Impaired Financing Receivable, Average Recorded Investment 4,771 5,697  
Impaired Financing Receivable, Interest Income, Cash Basis Method 13 5  
Construction Real Estate - Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 37,295   36,722
Accrued interest receivable 74   75
Recorded Investment 37,369   36,797
Construction Real Estate - Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 5,941   6,533
Accrued interest receivable 20   21
Recorded Investment 5,961   6,554
Residential Real Estate - Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 24,619 25,219  
Loan balance 411,314   410,571
Accrued interest receivable 1,007   1,014
Recorded Investment 412,321   411,585
Impaired Financing Receivable, Average Recorded Investment 24,897 25,373  
Impaired Financing Receivable, Interest Income, Cash Basis Method 1,965 255  
Residential Real Estate - Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 1,207,396   1,210,819
Accrued interest receivable 1,733   1,469
Recorded Investment 1,209,129   1,212,288
Residential Real Estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 209,260   211,415
Accrued interest receivable 784   769
Recorded Investment 210,044   212,184
Residential Real Estate - Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 21,734   22,638
Accrued interest receivable 82   78
Recorded Investment 21,816   22,716
Loans Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Accrued interest receivable 14,200   14,239
Commercial Financial And Agricultural [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance [1] 941,481   955,727
Accrued interest receivable [1] 3,592   3,437
Recorded Investment [1] 945,073   959,164
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 18,068 16,900  
Loan balance [1] 1,114,626   1,113,603
Accrued interest receivable [1] 3,652   4,009
Recorded Investment [1] 1,118,278   1,117,612
Impaired Financing Receivable, Average Recorded Investment 17,100 18,977  
Impaired Financing Receivable, Interest Income, Cash Basis Method 180 $ 163  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 979,111   967,111
Accrued interest receivable 2,896   3,032
Recorded Investment 982,007   970,143
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 2,817   2,856
Accrued interest receivable 39   14
Recorded Investment $ 2,856   $ 2,870
[1] Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.