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Loans and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Recorded investment in loans by credit quality indicators:      
Total $ 4,302,163 $ 4,247,765  
Unamortized net deferred loan costs 1,624 1,299 $ (251)
Total loans 4,303,787 4,249,064 $ 4,113,785
Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,190,017 4,144,395  
Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 51,280 42,579  
Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 40,182 38,216  
Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 20,684 22,575  
Commercial, financial, and agricultural [Member]      
Recorded investment in loans by credit quality indicators:      
Total 468,183 456,806  
Commercial, financial, and agricultural [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 460,963 452,372  
Commercial, financial, and agricultural [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,667 3,056  
Commercial, financial, and agricultural [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,573 459  
Commercial, financial, and agricultural [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 980 919  
Real estate construction, land development & other land loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 553,585 518,798  
Real estate construction, land development & other land loans [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 544,496 509,251  
Real estate construction, land development & other land loans [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,960 5,668  
Real estate construction, land development & other land loans [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,452 1,614  
Real estate construction, land development & other land loans [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,677 2,265  
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,054,994 1,047,924  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,009,860 1,004,458  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 16,271 12,238  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 18,905 21,113  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 9,958 10,115  
Real estate mortgage home equity loans / lines of credit [Member]      
Recorded investment in loans by credit quality indicators:      
Total 354,337 358,818  
Real estate mortgage home equity loans / lines of credit [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 345,187 348,792  
Real estate mortgage home equity loans / lines of credit [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,466 1,688  
Real estate mortgage home equity loans / lines of credit [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,052 6,653  
Real estate mortgage home equity loans / lines of credit [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,632 1,685  
Real estate mortgage commercial and other [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,785,878 1,776,886  
Real estate mortgage commercial and other [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,752,757 1,750,810  
Real estate mortgage commercial and other [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 18,664 14,484  
Real estate mortgage commercial and other [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 8,177 4,140  
Real estate mortgage commercial and other [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,280 7,452  
Installment loans to individuals [Member]      
Recorded investment in loans by credit quality indicators:      
Total 69,319 71,140  
Installment loans to individuals [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 68,606 70,357  
Installment loans to individuals [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 227 231  
Installment loans to individuals [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 329 413  
Installment loans to individuals [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 157 139  
Purchased credit impaired [Member]      
Recorded investment in loans by credit quality indicators:      
Total 15,867 17,393  
Purchased credit impaired [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 8,148 8,355  
Purchased credit impaired [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,025 5,214  
Purchased credit impaired [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,694 3,824  
Purchased credit impaired [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total