Loans and Asset Quality Information (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Non-covered loans:
Total loans	$ 2,189,415	$ 2,092,819	$ 2,113,530
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs	1,168	1,324	1,376
Loans - non-covered	2,190,583	2,094,143	2,114,906
Commercial, financial and agricultural
Non-covered loans:
Total loans	159,964	155,273	155,879
Percentage of Loans	7.00%	7.00%	7.00%
Real Estate construction, land development and other land loans
Non-covered loans:
Total loans	262,397	251,569	283,818
Percentage of Loans	12.00%	12.00%	13.00%
Real estate mortgage residential (1-4 family) first mortgages
Non-covered loans:
Total loans	712,802	679,401	669,088
Percentage of Loans	33.00%	33.00%	32.00%
Real estate mortgage home equity loans/lines of credit
Non-covered loans:
Total loans	214,473	219,443	229,415
Percentage of Loans	10.00%	11.00%	11.00%
Real estate mortgage commercial and other
Non-covered loans:
Total loans	771,711	715,973	702,717
Percentage of Loans	35.00%	34.00%	33.00%
Installment loans to individual
Non-covered loans:
Total loans	$ 68,068	$ 71,160	$ 72,613
Percentage of Loans	3.00%	3.00%	4.00%