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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - All Total Loans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Impaired loans
Impaired loans with no related allowance - Recorded Investment	$ 11,565	$ 18,561
Impaired loans with no related allowance - Unpaid Principal Balance	13,802	22,744
Impaired loans with no related allowance - Average Recorded Investment	13,461	23,770
Impaired loans with allowance - Recorded Investment	15,650	13,665
Impaired loans with allowance - Unpaid Principal Balance	15,893	13,951
Impaired loans with related allowance - Related Allowance	1,564	1,640
Impaired loans with related allowance - Average Recorded Investment	16,229	19,645
Commercial, financial, and agricultural [Member]
Impaired loans
Impaired loans with no related allowance - Recorded Investment	183	593
Impaired loans with no related allowance - Unpaid Principal Balance	425	706
Impaired loans with no related allowance - Average Recorded Investment	276	816
Impaired loans with allowance - Recorded Investment	396	51
Impaired loans with allowance - Unpaid Principal Balance	396	51
Impaired loans with related allowance - Related Allowance	215	7
Impaired loans with related allowance - Average Recorded Investment	214	202
Real estate - construction, land development & other land loans [Member]
Impaired loans
Impaired loans with no related allowance - Recorded Investment	2,743	3,221
Impaired loans with no related allowance - Unpaid Principal Balance	3,941	4,558
Impaired loans with no related allowance - Average Recorded Investment	2,846	3,641
Impaired loans with allowance - Recorded Investment	232	780
Impaired loans with allowance - Unpaid Principal Balance	241	798
Impaired loans with related allowance - Related Allowance	18	184
Impaired loans with related allowance - Average Recorded Investment	503	844
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
Impaired loans
Impaired loans with no related allowance - Recorded Investment	5,205	10,035
Impaired loans with no related allowance - Unpaid Principal Balance	5,728	12,220
Impaired loans with no related allowance - Average Recorded Investment	7,067	11,008
Impaired loans with allowance - Recorded Investment	9,595	10,772
Impaired loans with allowance - Unpaid Principal Balance	9,829	11,007
Impaired loans with related allowance - Related Allowance	1,099	1,339
Impaired loans with related allowance - Average Recorded Investment	10,077	13,314
Real estate - mortgage - home equity loans / lines of credit [Member]
Impaired loans
Impaired loans with no related allowance - Recorded Investment	368	114
Impaired loans with no related allowance - Unpaid Principal Balance	387	146
Impaired loans with no related allowance - Average Recorded Investment	129	139
Impaired loans with allowance - Recorded Investment		166
Impaired loans with allowance - Unpaid Principal Balance		166
Impaired loans with related allowance - Related Allowance		5
Impaired loans with related allowance - Average Recorded Investment	66	324
Real estate - mortgage - commercial and other [Member]
Impaired loans
Impaired loans with no related allowance - Recorded Investment	3,066	4,598
Impaired loans with no related allowance - Unpaid Principal Balance	3,321	5,112
Impaired loans with no related allowance - Average Recorded Investment	3,143	8,165
Impaired loans with allowance - Recorded Investment	5,427	1,896
Impaired loans with allowance - Unpaid Principal Balance	5,427	1,929
Impaired loans with related allowance - Related Allowance	232	105
Impaired loans with related allowance - Average Recorded Investment	5,369	4,912
Installment loans to individuals [Member]
Impaired loans
Impaired loans with no related allowance - Recorded Investment
Impaired loans with no related allowance - Unpaid Principal Balance		2
Impaired loans with no related allowance - Average Recorded Investment		1
Impaired loans with allowance - Recorded Investment
Impaired loans with allowance - Unpaid Principal Balance
Impaired loans with related allowance - Related Allowance
Impaired loans with related allowance - Average Recorded Investment		$ 49

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