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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
All loans (non-covered and covered):
Amount of loans	$ 2,518,053	$ 2,395,228
Percentage of Loans	100.00%	100.00%
Unamortized net deferred loan costs	$ 873	$ 946
Loans, total	2,518,926	2,396,174
Commercial, financial and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	$ 202,671	$ 160,878
Percentage of Loans	8.00%	7.00%
Real Estate construction, land development and other land loans [Member]
All loans (non-covered and covered):
Amount of loans	$ 308,969	$ 288,148
Percentage of Loans	12.00%	12.00%
Real estate mortgage residential (1-4 family) first mortgages [Member]
All loans (non-covered and covered):
Amount of loans	$ 768,559	$ 789,871
Percentage of Loans	31.00%	33.00%
Real estate mortgage home equity loans/lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	$ 232,601	$ 223,500
Percentage of Loans	9.00%	9.00%
Real estate mortgage commercial and other [Member]
All loans (non-covered and covered):
Amount of loans	$ 957,587	$ 882,127
Percentage of Loans	38.00%	37.00%
Installment loans to individual [Member]
All loans (non-covered and covered):
Amount of loans	$ 47,666	$ 50,704
Percentage of Loans	2.00%	2.00%

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