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Loans and Asset Quality Information (Schedule of Carrying Amount of Covered Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Covered loans:      
Impaired Purchased Loans - Carrying Value     $ 6
Impaired Purchased Loans - Unpaid Principal Balance     47
Nonimpaired Purchased Loans - Carrying Value     78,381
Nonimpaired Purchased Loans - Unpaid Principal Balance     90,536
Total Covered Loans - Carrying Value 78,387
Total Covered Loans - Unpaid Principal Balance     90,583
Commercial, financial, and agricultural [Member]      
Covered loans:      
Impaired Purchased Loans - Carrying Value    
Impaired Purchased Loans - Unpaid Principal Balance    
Nonimpaired Purchased Loans - Carrying Value    
Nonimpaired Purchased Loans - Unpaid Principal Balance    
Total Covered Loans - Carrying Value    
Total Covered Loans - Unpaid Principal Balance    
Real estate - construction, land development & other land loans [Member]      
Covered loans:      
Impaired Purchased Loans - Carrying Value    
Impaired Purchased Loans - Unpaid Principal Balance    
Nonimpaired Purchased Loans - Carrying Value     161
Nonimpaired Purchased Loans - Unpaid Principal Balance     162
Total Covered Loans - Carrying Value     161
Total Covered Loans - Unpaid Principal Balance     162
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Covered loans:      
Impaired Purchased Loans - Carrying Value    
Impaired Purchased Loans - Unpaid Principal Balance     33
Nonimpaired Purchased Loans - Carrying Value     68,079
Nonimpaired Purchased Loans - Unpaid Principal Balance     78,940
Total Covered Loans - Carrying Value     68,079
Total Covered Loans - Unpaid Principal Balance     78,973
Real estate mortgage home equity loans / lines of credit [Member]      
Covered loans:      
Impaired Purchased Loans - Carrying Value     6
Impaired Purchased Loans - Unpaid Principal Balance     14
Nonimpaired Purchased Loans - Carrying Value     9,882
Nonimpaired Purchased Loans - Unpaid Principal Balance     11,140
Total Covered Loans - Carrying Value     9,888
Total Covered Loans - Unpaid Principal Balance     11,154
Real estate - mortgage - commercial and other [Member]      
Covered loans:      
Impaired Purchased Loans - Carrying Value    
Impaired Purchased Loans - Unpaid Principal Balance    
Nonimpaired Purchased Loans - Carrying Value     259
Nonimpaired Purchased Loans - Unpaid Principal Balance     294
Total Covered Loans - Carrying Value     259
Total Covered Loans - Unpaid Principal Balance     294
Installment loans to individuals [Member]      
Covered loans:      
Impaired Purchased Loans - Carrying Value    
Impaired Purchased Loans - Unpaid Principal Balance    
Nonimpaired Purchased Loans - Carrying Value    
Nonimpaired Purchased Loans - Unpaid Principal Balance    
Total Covered Loans - Carrying Value    
Total Covered Loans - Unpaid Principal Balance