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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment $ 50,322 $ 70,127 $ 56,564
Loan balance 5,292,349   5,372,483
Accrued interest receivable 20,369   22,164
Recorded Investment 5,307,975   5,389,142
Impaired Financing Receivable, Average Recorded Investment 50,863 67,950  
Impaired Financing Receivable, Interest Income, Cash Basis Method 421 811  
Construction Real Estate Commercial [Domain]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 1,393 2,041  
Loan balance 126,561   125,389
Accrued interest receivable 375   401
Recorded Investment 126,936   125,790
Impaired Financing Receivable, Average Recorded Investment 1,377 2,096  
Impaired Financing Receivable, Interest Income, Cash Basis Method 14 15  
Commercial Financial And Agricultural [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 27,050 22,542  
Impaired Financing Receivable, Average Recorded Investment 20,078 19,471  
Impaired Financing Receivable, Interest Income, Cash Basis Method 174 220  
Construction Real Estate - Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 51,379   52,203
Accrued interest receivable 119   133
Recorded Investment 51,498   52,336
Construction Real Estate - Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 3,244   3,878
Accrued interest receivable 11   13
Recorded Investment 3,255   3,891
Residential Real Estate - Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 2,896 22,803  
Loan balance 389,766   393,094
Accrued interest receivable 1,043   1,029
Recorded Investment 390,809   394,123
Impaired Financing Receivable, Average Recorded Investment 11,215 23,081  
Impaired Financing Receivable, Interest Income, Cash Basis Method 31 345  
Residential Real Estate - Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 1,097,166   1,110,426
Accrued interest receivable 1,327   1,516
Recorded Investment 1,098,493   1,111,942
Residential Real Estate - HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 194,158   203,178
Accrued interest receivable 904   974
Recorded Investment 195,062   204,152
Residential Real Estate - Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 17,570   18,526
Accrued interest receivable 49   53
Recorded Investment 17,619   18,579
Loans Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Accrued interest receivable 15,626   16,659
Commercial Financial And Agricultural [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance [1] 1,000,786   1,053,453
Accrued interest receivable [1] 4,243   4,413
Recorded Investment [1] 1,005,029   1,057,866
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 18,983 22,732  
Loan balance [1] 1,156,563   1,167,607
Accrued interest receivable [1] 4,047   4,283
Recorded Investment [1] 1,160,610   1,171,890
Impaired Financing Receivable, Average Recorded Investment 18,193 23,297  
Impaired Financing Receivable, Interest Income, Cash Basis Method 202 231  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment   9  
Loan balance 1,252,251   1,241,736
Accrued interest receivable 3,462   3,808
Recorded Investment 1,255,713   1,245,544
Impaired Financing Receivable, Average Recorded Investment   $ 5  
Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan balance 2,905   2,993
Accrued interest receivable 46   36
Recorded Investment $ 2,951   $ 3,029
[1] Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.