Loans and Asset Quality Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
All loans (non-covered and covered):
Amount of loans	$ 2,433,734	$ 2,462,266	$ 2,429,694
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs	651	928	1,168
Loans, total	2,434,385	2,463,194	2,430,862
Commercial, financial and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	165,021	168,469	164,767
Percentage of Loans	7.00%	7.00%	7.00%
Real Estate construction, land development and other land loans [Member]
All loans (non-covered and covered):
Amount of loans	295,868	305,246	297,390
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	814,712	838,862	832,761
Percentage of Loans	33.00%	34.00%	34.00%
Real estate mortgage home equity loans/lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	227,381	227,907	231,446
Percentage of Loans	9.00%	9.00%	10.00%
Real estate mortgage commercial and other [Member]
All loans (non-covered and covered):
Amount of loans	868,599	855,249	834,554
Percentage of Loans	36.00%	35.00%	34.00%
Installment loans to individual [Member]
All loans (non-covered and covered):
Amount of loans	$ 62,153	$ 66,533	$ 68,776
Percentage of Loans	3.00%	3.00%	3.00%