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Loans and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Recorded investment in loans by credit quality indicators:      
Total $ 4,149,459 $ 4,043,355  
Unamortized net deferred loan costs (69) (986) $ (808)
Total loans 4,149,390 4,042,369 $ 3,375,976
Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,021,169 3,891,038  
Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 48,579 72,915  
Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 54,217 58,434  
Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 25,494 20,968  
Commercial, financial, and agricultural [Member]      
Recorded investment in loans by credit quality indicators:      
Total 417,097 380,482  
Commercial, financial, and agricultural [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 410,434 368,658  
Commercial, financial, and agricultural [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 2,322 9,901  
Commercial, financial, and agricultural [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 934 922  
Commercial, financial, and agricultural [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,407 1,001  
Real estate construction, land development & other land loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 599,706 538,613  
Real estate construction, land development & other land loans [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 586,310 523,642  
Real estate construction, land development & other land loans [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,812 7,129  
Real estate construction, land development & other land loans [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,210 6,020  
Real estate construction, land development & other land loans [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,374 1,822  
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Recorded investment in loans by credit quality indicators:      
Total 992,796 963,913  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 941,399 905,111  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 13,829 16,235  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 26,055 30,366  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 11,513 12,201  
Real estate mortgage home equity loans / lines of credit [Member]      
Recorded investment in loans by credit quality indicators:      
Total 369,502 379,695  
Real estate mortgage home equity loans / lines of credit [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 357,507 365,982  
Real estate mortgage home equity loans / lines of credit [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,698 3,784  
Real estate mortgage home equity loans / lines of credit [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 8,532 7,405  
Real estate mortgage home equity loans / lines of credit [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,765 2,524  
Real estate mortgage commercial and other [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,678,033 1,683,595  
Real estate mortgage commercial and other [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,648,367 1,647,725  
Real estate mortgage commercial and other [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 16,644 23,355  
Real estate mortgage commercial and other [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,730 9,190  
Real estate mortgage commercial and other [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 7,292 3,345  
Installment loans to individuals [Member]      
Recorded investment in loans by credit quality indicators:      
Total 71,493 73,892  
Installment loans to individuals [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 70,776 73,379  
Installment loans to individuals [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 215 222  
Installment loans to individuals [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 359 216  
Installment loans to individuals [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 143 75  
Purchased credit impaired [Member]      
Recorded investment in loans by credit quality indicators:      
Total 20,832 23,165  
Purchased credit impaired [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,376 6,541  
Purchased credit impaired [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 7,059 12,309  
Purchased credit impaired [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 7,397 4,315  
Purchased credit impaired [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total