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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 46,760 $ 73,609 $ 46,760 $ 73,609 $ 56,564
Loan balance 5,625,323   5,625,323   5,372,483
Accrued interest receivable 23,907   23,907   22,164
Recorded Investment 5,644,433   5,644,433   5,389,142
Impaired Financing Receivable, Average Recorded Investment 54,679 72,580 52,015 68,953  
Impaired Financing Receivable, Interest Income, Cash Basis Method 485 654 1,292 1,902  
Construction Real Estate Commercial [Domain]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,016 1,460 2,016 1,460  
Loan balance 151,757   151,757   125,389
Accrued interest receivable 474   474   401
Recorded Investment 152,231   152,231   125,790
Impaired Financing Receivable, Average Recorded Investment 2,246 1,554 1,661 1,830  
Impaired Financing Receivable, Interest Income, Cash Basis Method 4 18 31 49  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 16,026 29,848 16,026 29,848  
Impaired Financing Receivable, Average Recorded Investment 23,247 28,412 22,686 23,770  
Impaired Financing Receivable, Interest Income, Cash Basis Method 187 398 506 738  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 65,842   65,842   52,203
Accrued interest receivable 158   158   133
Recorded Investment 66,000   66,000   52,336
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 2,597   2,597   3,878
Accrued interest receivable 8   8   13
Recorded Investment 2,605   2,605   3,891
Residential Real Estate Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 2,913 19,298 2,913 19,298  
Loan balance 403,147   403,147   393,094
Accrued interest receivable 1,156   1,156   1,029
Recorded Investment 404,303   404,303   394,123
Impaired Financing Receivable, Average Recorded Investment 2,758 20,365 6,086 20,876  
Impaired Financing Receivable, Interest Income, Cash Basis Method 26 46 84 452  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,140,648   1,140,648   1,110,426
Accrued interest receivable 1,719   1,719   1,516
Recorded Investment 1,142,367   1,142,367   1,111,942
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 221,632   221,632   203,178
Accrued interest receivable 964   964   974
Recorded Investment 222,596   222,596   204,152
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 15,556   15,556   18,526
Accrued interest receivable 43   43   53
Recorded Investment 15,599   15,599   18,579
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Accrued interest receivable 19,110   19,110   16,659
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance [1] 1,031,500   1,031,500   1,053,453
Accrued interest receivable [1] 5,606   5,606   4,413
Recorded Investment [1] 1,037,106   1,037,106   1,057,866
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 25,805 22,995 25,805 22,995  
Loan balance [1] 1,302,630   1,302,630   1,167,607
Accrued interest receivable [1] 5,169   5,169   4,283
Recorded Investment [1] 1,307,799   1,307,799   1,171,890
Impaired Financing Receivable, Average Recorded Investment 26,428 22,241 21,582 22,470  
Impaired Financing Receivable, Interest Income, Cash Basis Method 268 192 671 663  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment   8   8  
Loan balance 1,287,382   1,287,382   1,241,736
Accrued interest receivable 3,773   3,773   3,808
Recorded Investment 1,291,155   1,291,155   1,245,544
Impaired Financing Receivable, Average Recorded Investment   $ 8   $ 7  
Leases [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 2,632   2,632   2,993
Accrued interest receivable 40   40   36
Recorded Investment $ 2,672   $ 2,672   $ 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.