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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 73,609 $ 77,998 $ 73,609 $ 77,998 $ 70,426
Loan balance 5,365,877   5,365,877   5,271,857
Accrued interest receivable 21,246   21,246   18,822
Recorded Investment 5,382,343   5,382,343   5,286,830
Impaired Financing Receivable, Average Recorded Investment 72,580 84,736 68,953 81,191  
Impaired Financing Receivable, Interest Income, Cash Basis Method 654 767 1,902 4,011  
Construction Real Estate Commercial [Domain]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 1,460 4,377 1,460 4,377  
Loan balance 139,210   139,210   135,343
Accrued interest receivable 462   462   398
Recorded Investment 139,672   139,672   135,741
Impaired Financing Receivable, Average Recorded Investment 1,554 5,643 1,830 6,244  
Impaired Financing Receivable, Interest Income, Cash Basis Method 18 16 49 44  
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 29,848 23,856 29,848 23,856  
Impaired Financing Receivable, Average Recorded Investment 28,412 26,679 23,770 28,217  
Impaired Financing Receivable, Interest Income, Cash Basis Method 398 194 738 740  
Construction Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 47,629   47,629   48,699
Accrued interest receivable 109   109   106
Recorded Investment 47,738   47,738   48,805
Construction Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 4,209   4,209   4,903
Accrued interest receivable 11   11   17
Recorded Investment 4,220   4,220   4,920
Residential Real Estate - Commercial [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 19,298 23,700 19,298 23,700  
Loan balance 391,502   391,502   406,687
Accrued interest receivable 959   959   940
Recorded Investment 392,461   392,461   407,627
Impaired Financing Receivable, Average Recorded Investment 20,365 24,422 20,876 24,618  
Impaired Financing Receivable, Interest Income, Cash Basis Method 46 314 452 2,619  
Residential Real Estate - Mortgage [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 1,135,289   1,135,289   1,169,495
Accrued interest receivable 1,469   1,469   1,459
Recorded Investment 1,136,758   1,136,758   1,170,954
Residential Real Estate - HELOC [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 206,665   206,665   212,441
Accrued interest receivable 896   896   853
Recorded Investment 207,561   207,561   213,294
Residential Real Estate - Installment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 19,131   19,131   19,874
Accrued interest receivable 54   54   67
Recorded Investment 19,185   19,185   19,941
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Accrued interest receivable 16,466   16,466   14,973
Commercial Financial And Agricultural [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance [1] 1,025,057   1,025,057   994,619
Accrued interest receivable [1] 4,581   4,581   3,558
Recorded Investment [1] 1,029,638   1,029,638   998,177
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 22,995 26,065 22,995 26,065  
Loan balance [1] 1,155,662   1,155,662   1,155,703
Accrued interest receivable [1] 4,464   4,464   4,161
Recorded Investment [1] 1,160,126   1,160,126   1,159,864
Impaired Financing Receivable, Average Recorded Investment 22,241 27,982 22,470 22,108  
Impaired Financing Receivable, Interest Income, Cash Basis Method 192 243 663 608  
Consumer [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Recorded Investment 8   8    
Loan balance 1,238,191   1,238,191   1,120,850
Accrued interest receivable 3,409   3,409   3,385
Recorded Investment 1,241,600   1,241,600   1,124,235
Impaired Financing Receivable, Average Recorded Investment 8 $ 10 7 $ 4  
Leases [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loan balance 3,332   3,332   3,243
Accrued interest receivable 52   52   29
Recorded Investment $ 3,384   $ 3,384   $ 3,272
[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.