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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, 2017
Dec. 31, 2016
Sep. 30, 2016
Recorded investment in loans by credit quality indicators:      
Total $ 3,430,192 $ 2,710,761  
Unamortized net deferred loan costs (437) (49) $ 198
Total loans 3,429,755 2,710,712 2,651,459
Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,284,367 2,547,664  
Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 60,505 64,558  
Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 61,970 71,071  
Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 23,350 27,468  
Commercial, financial, and agricultural [Member]      
Recorded investment in loans by credit quality indicators:      
Total 376,685 261,813  
Commercial, financial, and agricultural [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 365,505 247,451  
Commercial, financial, and agricultural [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 8,974 10,560  
Commercial, financial, and agricultural [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,210 1,960  
Commercial, financial, and agricultural [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 996 1,842  
Real estate construction, land development & other land loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 449,870 354,667  
Real estate construction, land development & other land loans [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 435,960 335,068  
Real estate construction, land development & other land loans [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,009 8,762  
Real estate construction, land development & other land loans [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,336 7,892  
Real estate construction, land development & other land loans [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,565 2,945  
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Recorded investment in loans by credit quality indicators:      
Total 792,912 750,679  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 729,341 678,878  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 15,298 16,998  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 33,395 38,786  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 14,878 16,017  
Real estate mortgage home equity loans / lines of credit [Member]      
Recorded investment in loans by credit quality indicators:      
Total 314,611 239,105  
Real estate mortgage home equity loans / lines of credit [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 304,114 226,159  
Real estate mortgage home equity loans / lines of credit [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,262 1,436  
Real estate mortgage home equity loans / lines of credit [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,985 9,155  
Real estate mortgage home equity loans / lines of credit [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 2,250 2,355  
Real estate mortgage commercial and other [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,422,109 1,048,946  
Real estate mortgage commercial and other [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,384,255 1,005,687  
Real estate mortgage commercial and other [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 23,736 26,032  
Real estate mortgage commercial and other [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 10,584 13,019  
Real estate mortgage commercial and other [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,534 4,208  
Installment loans to individuals [Member]      
Recorded investment in loans by credit quality indicators:      
Total 58,971 55,037  
Installment loans to individuals [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 58,444 54,421  
Installment loans to individuals [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 224 256  
Installment loans to individuals [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 176 259  
Installment loans to individuals [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 127 101  
Purchased credit impaired [Member]      
Recorded investment in loans by credit quality indicators:      
Total 15,034 514  
Purchased credit impaired [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,748  
Purchased credit impaired [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,002 514  
Purchased credit impaired [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,284  
Purchased credit impaired [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total