Loans And The Allowance For Credit Losses (Loan Loss Experience And Changes In The Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 11,353	$ 10,754
Chargeoffs	(61)	(329)
Recoveries	70	178
Provision (credit)	950	750	(1,750)
Ending balance	12,312	11,353	10,754
Ending balance individually evaluated for impairment	569	227
Ending balance collectively evaluated for impairment	11,743	11,126
Financing receivables, Ending balance individually evaluated for impairment	3,022	2,511
Financing receivables, Ending balance collectively evaluated for impairment	1,079,901	1,025,115
Loans	1,082,923	1,027,626
Allowance for loan losses	11,562	10,619
Reserve for undisbursed lines of credit	750	734
Total allowance for credit losses	12,312	11,353	10,754
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,905	2,617
Chargeoffs	(9)	(80)
Recoveries	30	101
Provision (credit)	521	267
Ending balance	3,447	2,905
Ending balance individually evaluated for impairment	149	17
Ending balance collectively evaluated for impairment	3,298	2,888
Financing receivables, Ending balance individually evaluated for impairment	233	114
Financing receivables, Ending balance collectively evaluated for impairment	164,790	146,876
Loans	165,023	146,990
Allowance for loan losses	2,915	2,412
Reserve for undisbursed lines of credit	532	493
Total allowance for credit losses	3,447	2,905
Municipal Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	309	236
Chargeoffs	0	0
Recoveries	0	0
Provision (credit)	213	73
Ending balance	522	309
Ending balance individually evaluated for impairment	0	0
Ending balance collectively evaluated for impairment	522	309
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	84,689	101,705
Loans	84,689	101,705
Allowance for loan losses	494	307
Reserve for undisbursed lines of credit	28	2
Total allowance for credit losses	522	309
Real Estate Loans – Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,138	2,428
Chargeoffs	(20)	(83)
Recoveries	14	4
Provision (credit)	450	789
Ending balance	3,582	3,138
Ending balance individually evaluated for impairment	361	210
Ending balance collectively evaluated for impairment	3,221	2,928
Financing receivables, Ending balance individually evaluated for impairment	2,317	1,985
Financing receivables, Ending balance collectively evaluated for impairment	487,634	437,833
Loans	489,951	439,818
Allowance for loan losses	3,494	3,025
Reserve for undisbursed lines of credit	88	113
Total allowance for credit losses	3,582	3,138
Real Estate Loans – Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,484	5,143
Chargeoffs	(32)	(60)
Recoveries	1	44
Provision (credit)	46	(643)
Ending balance	4,499	4,484
Ending balance individually evaluated for impairment	59	0
Ending balance collectively evaluated for impairment	4,440	4,484
Financing receivables, Ending balance individually evaluated for impairment	472	412
Financing receivables, Ending balance collectively evaluated for impairment	327,150	313,503
Loans	327,622	313,915
Allowance for loan losses	4,444	4,442
Reserve for undisbursed lines of credit	55	42
Total allowance for credit losses	4,499	4,484
Real Estate Loans – Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	477	283
Chargeoffs	0	(96)
Recoveries	25	25
Provision (credit)	(268)	265
Ending balance	234	477
Ending balance individually evaluated for impairment	0	0
Ending balance collectively evaluated for impairment	234	477
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	10,561	18,993
Loans	10,561	18,993
Allowance for loan losses	187	393
Reserve for undisbursed lines of credit	47	84
Total allowance for credit losses	234	477
Installment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	23	24
Chargeoffs	0	(10)
Recoveries	0	4
Provision (credit)	(6)	5
Ending balance	17	23
Ending balance individually evaluated for impairment	0	0
Ending balance collectively evaluated for impairment	17	23
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	4,701	5,806
Loans	4,701	5,806
Allowance for loan losses	17	23
Reserve for undisbursed lines of credit	0	0
Total allowance for credit losses	17	23
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	17	23
Chargeoffs	0	0
Recoveries	0	0
Provision (credit)	(6)	(6)
Ending balance	11	17
Ending balance individually evaluated for impairment	0	0
Ending balance collectively evaluated for impairment	11	17
Financing receivables, Ending balance individually evaluated for impairment	0	0
Financing receivables, Ending balance collectively evaluated for impairment	376	399
Loans	376	399
Allowance for loan losses	11	17
Reserve for undisbursed lines of credit	0	0
Total allowance for credit losses	$ 11	$ 17