Loans and Asset Quality Information (Schedule of Carrying Amount of Covered Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Covered loans:
Impaired Purchased Loans - Carrying Value	$ 1,520	$ 1,950
Impaired Purchased Loans - Unpaid Principal Balance	4,443	5,183
Nonimpaired Purchased Loans - Carrying Value	105,089	125,644
Nonimpaired Purchased Loans - Unpaid Principal Balance	121,240	145,698
Total Covered Loans - Carrying Value	106,609	127,594	$ 133,249
Total Covered Loans - Unpaid Principal Balance	125,683	150,881
Commercial, financial and agricultural [Member]
Covered loans:
Impaired Purchased Loans - Carrying Value	59	66
Impaired Purchased Loans - Unpaid Principal Balance	116	123
Nonimpaired Purchased Loans - Carrying Value	947	1,617
Nonimpaired Purchased Loans - Unpaid Principal Balance	975	1,661
Total Covered Loans - Carrying Value	1,006	1,683
Total Covered Loans - Unpaid Principal Balance	1,091	1,784
Real Estate construction, land development and other land loans [Member]
Covered loans:
Impaired Purchased Loans - Carrying Value	297	309
Impaired Purchased Loans - Unpaid Principal Balance	522	534
Nonimpaired Purchased Loans - Carrying Value	3,664	5,235
Nonimpaired Purchased Loans - Unpaid Principal Balance	3,912	6,471
Total Covered Loans - Carrying Value	3,961	5,544
Total Covered Loans - Unpaid Principal Balance	4,434	7,005
Real estate mortgage residential (1-4 family) first mortgages [Member]
Covered loans:
Impaired Purchased Loans - Carrying Value	109	362
Impaired Purchased Loans - Unpaid Principal Balance	636	1,298
Nonimpaired Purchased Loans - Carrying Value	78,151	89,408
Nonimpaired Purchased Loans - Unpaid Principal Balance	91,570	104,678
Total Covered Loans - Carrying Value	78,260	89,770
Total Covered Loans - Unpaid Principal Balance	92,206	105,976
Real estate mortgage home equity loans/lines of credit [Member]
Covered loans:
Impaired Purchased Loans - Carrying Value	8	12
Impaired Purchased Loans - Unpaid Principal Balance	15	19
Nonimpaired Purchased Loans - Carrying Value	11,196	12,791
Nonimpaired Purchased Loans - Unpaid Principal Balance	12,912	15,099
Total Covered Loans - Carrying Value	11,204	12,803
Total Covered Loans - Unpaid Principal Balance	12,927	15,118
Real estate mortgage commercial and other [Member]
Covered loans:
Impaired Purchased Loans - Carrying Value	1,047	1,201
Impaired Purchased Loans - Unpaid Principal Balance	3,154	3,209
Nonimpaired Purchased Loans - Carrying Value	11,131	16,593
Nonimpaired Purchased Loans - Unpaid Principal Balance	11,871	17,789
Total Covered Loans - Carrying Value	12,178	17,794
Total Covered Loans - Unpaid Principal Balance	$ 15,025	$ 20,998