Loans and Asset Quality Information (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Non-covered loans:
Total loans	$ 2,131,360	$ 2,092,819	$ 2,093,184
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs	1,323	1,324	1,340
Loans - non-covered	2,132,683	2,094,143	2,094,524
Commercial, financial and agricultural
Non-covered loans:
Total loans	157,235	155,273	151,148
Percentage of Loans	7.00%	7.00%	7.00%
Real Estate construction, land development and other land loans
Non-covered loans:
Total loans	253,275	251,569	287,833
Percentage of Loans	12.00%	12.00%	14.00%
Real estate mortgage residential (1-4 family) first mortgages
Non-covered loans:
Total loans	700,429	679,401	659,946
Percentage of Loans	33.00%	33.00%	31.00%
Real estate mortgage home equity loans/lines of credit
Non-covered loans:
Total loans	217,567	219,443	233,915
Percentage of Loans	10.00%	11.00%	11.00%
Real estate mortgage commercial and other
Non-covered loans:
Total loans	736,314	715,973	685,734
Percentage of Loans	35.00%	34.00%	33.00%
Installment loans to individual
Non-covered loans:
Total loans	$ 66,540	$ 71,160	$ 74,608
Percentage of Loans	3.00%	3.00%	4.00%