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Loans and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Recorded investment in loans by credit quality indicators:      
Total $ 4,190,139 $ 4,043,355  
Unamortized net deferred loan costs 489 (986) $ (437)
Total loans 4,190,628 4,042,369 $ 3,429,755
Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,075,835 3,891,038  
Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 44,470 72,915  
Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 51,567 58,434  
Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 18,267 20,968  
Commercial, financial, and agricultural [Member]      
Recorded investment in loans by credit quality indicators:      
Total 435,466 380,482  
Commercial, financial, and agricultural [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 429,721 368,658  
Commercial, financial, and agricultural [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 2,797 9,901  
Commercial, financial, and agricultural [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 856 922  
Commercial, financial, and agricultural [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 2,092 1,001  
Real estate construction, land development & other land loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 558,925 538,613  
Real estate construction, land development & other land loans [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 547,323 523,642  
Real estate construction, land development & other land loans [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,331 7,129  
Real estate construction, land development & other land loans [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,620 6,020  
Real estate construction, land development & other land loans [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 651 1,822  
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,032,261 963,913  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 984,851 905,111  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 13,052 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 25,551 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 8,807 12,201  
Real estate mortgage home equity loans / lines of credit [Member]      
Recorded investment in loans by credit quality indicators:      
Total 362,484 379,695  
Real estate mortgage home equity loans / lines of credit [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 351,575 365,982  
Real estate mortgage home equity loans / lines of credit [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,697 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 7,793 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 1,419 2,524  
Real estate mortgage commercial and other [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,711,010 1,683,595  
Real estate mortgage commercial and other [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,684,024 1,647,725  
Real estate mortgage commercial and other [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 15,075 23,355  
Real estate mortgage commercial and other [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,733 9,190  
Real estate mortgage commercial and other [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,178 3,345  
Installment loans to individuals [Member]      
Recorded investment in loans by credit quality indicators:      
Total 69,804 73,892  
Installment loans to individuals [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 69,072 73,379  
Installment loans to individuals [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 212 222  
Installment loans to individuals [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 400 216  
Installment loans to individuals [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 120 75  
Purchased credit impaired [Member]      
Recorded investment in loans by credit quality indicators:      
Total 20,189 23,165  
Purchased credit impaired [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 9,269 6,541  
Purchased credit impaired [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,306 12,309  
Purchased credit impaired [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,614 4,315  
Purchased credit impaired [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total