Loans and Asset Quality Information (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Non-covered loans:
Total loans	$ 2,135,596	$ 2,067,182	$ 2,057,429
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs	1,478	1,280	1,295
Loans - non-covered	2,137,074	2,069,152	2,058,724
Commercial, financial and agricultural
Non-covered loans:
Total loans	154,956	152,627	150,252
Percentage of Loans	7.00%	8.00%	7.00%
Real Estate construction, land development & other land loans
Non-covered loans:
Total loans	273,985	290,983	298,650
Percentage of Loans	13.00%	14.00%	14.00%
Real estate mortgage residential (1-4 family) first mortgages
Non-covered loans:
Total loans	681,168	646,616	637,129
Percentage of Loans	32.00%	31.00%	31.00%
Real estate mortgage home equity loans/lines of credit
Non-covered loans:
Total loans	223,154	233,171	236,578
Percentage of Loans	10.00%	11.00%	12.00%
Real estate mortgage commercial and other
Non-covered loans:
Total loans	729,310	666,882	656,035
Percentage of Loans	34.00%	32.00%	32.00%
Installment loans to individual
Non-covered loans:
Total loans	$ 73,023	$ 77,593	$ 78,785
Percentage of Loans	4.00%	4.00%	4.00%