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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, 2017
Dec. 31, 2016
Jun. 30, 2016
Recorded investment in loans by credit quality indicators:      
Total $ 3,376,784 $ 2,710,761  
Unamortized net deferred loan costs (808) (49) $ 1,074
Total loans 3,375,976 2,710,712 2,598,134
Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,224,167 2,547,664  
Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 60,910 64,558  
Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 68,912 71,071  
Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 22,795 27,468  
Commercial, financial, and agricultural [Member]      
Recorded investment in loans by credit quality indicators:      
Total 383,565 261,813  
Commercial, financial, and agricultural [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 372,670 247,451  
Commercial, financial, and agricultural [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 8,517 10,560  
Commercial, financial, and agricultural [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,351 1,960  
Commercial, financial, and agricultural [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,027 1,842  
Real estate construction, land development & other land loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 446,206 354,667  
Real estate construction, land development & other land loans [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 430,501 335,068  
Real estate construction, land development & other land loans [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 7,365 8,762  
Real estate construction, land development & other land loans [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 7,333 7,892  
Real estate construction, land development & other land loans [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,007 2,945  
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Recorded investment in loans by credit quality indicators:      
Total 780,307 750,679  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 715,645 678,878  
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 14,401 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 34,999 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 15,262 16,017  
Real estate mortgage home equity loans / lines of credit [Member]      
Recorded investment in loans by credit quality indicators:      
Total 320,228 239,105  
Real estate mortgage home equity loans / lines of credit [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 308,378 226,159  
Real estate mortgage home equity loans / lines of credit [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,415 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 8,493 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 1,942 2,355  
Real estate mortgage commercial and other [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,372,682 1,048,946  
Real estate mortgage commercial and other [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 1,333,782 1,005,687  
Real estate mortgage commercial and other [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 23,728 26,032  
Real estate mortgage commercial and other [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 11,721 13,019  
Real estate mortgage commercial and other [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 3,451 4,208  
Installment loans to individuals [Member]      
Recorded investment in loans by credit quality indicators:      
Total 56,950 55,037  
Installment loans to individuals [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 56,238 54,421  
Installment loans to individuals [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 227 256  
Installment loans to individuals [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 379 259  
Installment loans to individuals [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 106 101  
Purchased credit impaired [Member]      
Recorded investment in loans by credit quality indicators:      
Total 16,846 514  
Purchased credit impaired [Member] | Pass [Member]      
Recorded investment in loans by credit quality indicators:      
Total 6,953  
Purchased credit impaired [Member] | Special Mention Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 5,257 514  
Purchased credit impaired [Member] | Classified Accruing Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total 4,636  
Purchased credit impaired [Member] | Classified Nonaccrual Loans [Member]      
Recorded investment in loans by credit quality indicators:      
Total