Loans and Asset Quality Information (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Non-covered loans:
Total loans	$ 2,214,149	$ 2,092,819	$ 2,135,596
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs	1,024	1,324	1,478
Loans - non-covered	2,215,173	2,094,143	2,137,074
Commercial, financial and agricultural
Non-covered loans:
Total loans	161,552	155,273	154,956
Percentage of Loans	7.00%	7.00%	7.00%
Real Estate construction, land development and other land loans
Non-covered loans:
Total loans	261,457	251,569	273,985
Percentage of Loans	12.00%	12.00%	13.00%
Real estate mortgage residential (1-4 family) first mortgages
Non-covered loans:
Total loans	722,716	679,401	681,168
Percentage of Loans	33.00%	33.00%	32.00%
Real estate mortgage home equity loans/lines of credit
Non-covered loans:
Total loans	213,026	219,443	223,154
Percentage of Loans	10.00%	11.00%	10.00%
Real estate mortgage commercial and other
Non-covered loans:
Total loans	788,240	715,973	729,310
Percentage of Loans	35.00%	34.00%	34.00%
Installment loans to individual
Non-covered loans:
Total loans	$ 67,158	$ 71,160	$ 73,023
Percentage of Loans	3.00%	3.00%	4.00%