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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
All loans (non-covered and covered):
Amount of loans	$ 2,651,261	$ 2,518,053	$ 2,480,938
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs	$ 198	$ 873	$ 765
Total loans	2,651,459	2,518,926	2,481,703
Commercial, financial, and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	$ 248,877	$ 202,671	$ 198,624
Percentage of Loans	9.00%	8.00%	8.00%
Real estate - construction, land development & other land loans [Member]
All loans (non-covered and covered):
Amount of loans	$ 327,863	$ 308,969	$ 294,426
Percentage of Loans	12.00%	12.00%	12.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
All loans (non-covered and covered):
Amount of loans	$ 756,880	$ 768,559	$ 770,691
Percentage of Loans	29.00%	31.00%	31.00%
Real estate - mortgage - home equity loans / lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	$ 239,049	$ 232,601	$ 224,639
Percentage of Loans	9.00%	9.00%	9.00%
Real estate mortgage commercial and other [Member]
All loans (non-covered and covered):
Amount of loans	$ 1,026,328	$ 957,587	$ 944,432
Percentage of Loans	39.00%	38.00%	38.00%
Installment loans to individuals [Member]
All loans (non-covered and covered):
Amount of loans	$ 52,264	$ 47,666	$ 47,120
Percentage of Loans	2.00%	2.00%	2.00%

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