Loans And The Allowance For Credit Losses (Loan Loss Experience And Activity In The Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	$ 11,632	$ 10,756	$ 11,353	$ 10,754
Chargeoffs	(29)	(135)	(29)	(205)
Recoveries	14	30	43	102
Provision (credit)	200	250	450	250
Ending balance	11,817	10,901	11,817	10,901
Ending balance individually evaluated for impairment	204	209	204	209
Ending balance collectively evaluated for impairment	11,613	10,692	11,613	10,692
Financing receivables Ending balance individually evaluated for impairment	3,130	3,444	3,130	3,444
Financing receivables Ending balance collectively evaluated for impairment	1,022,535	939,906	1,022,535	939,906
Loans	1,025,665	943,350	1,025,665	943,350	1,027,626
Allowance for loan losses	11,203	10,438	11,203	10,438	10,619
Reserve for undisbursed lines of credit	614	463	614	463
Total allowance for credit losses	11,817	10,901	11,817	10,901
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	2,733	2,689	2,905	2,617
Chargeoffs	(9)	(34)	(9)	(77)
Recoveries	(2)	23	18	44
Provision (credit)	380	444	188	538
Ending balance	3,102	3,122	3,102	3,122
Ending balance individually evaluated for impairment	3	130	3	130
Ending balance collectively evaluated for impairment	3,099	2,992	3,099	2,992
Financing receivables Ending balance individually evaluated for impairment	69	428	69	428
Financing receivables Ending balance collectively evaluated for impairment	173,045	165,237	173,045	165,237
Loans	173,114	165,665	173,114	165,665	146,990
Allowance for loan losses	2,673	2,806	2,673	2,806
Reserve for undisbursed lines of credit	429	316	429	316
Total allowance for credit losses	3,102	3,122	3,102	3,122
Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	542	289	309	236
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Provision (credit)	(132)	(174)	101	(121)
Ending balance	410	115	410	115
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	410	115	410	115
Financing receivables Ending balance individually evaluated for impairment	0	0	0	0
Financing receivables Ending balance collectively evaluated for impairment	42,578	37,933	42,578	37,933
Loans	42,578	37,933	42,578	37,933	101,705
Allowance for loan losses	408	115	408	115
Reserve for undisbursed lines of credit	2	0	2	0
Total allowance for credit losses	410	115	410	115
Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	3,374	2,683	3,138	2,428
Chargeoffs	(20)	(41)	(20)	(49)
Recoveries	12	0	12	1
Provision (credit)	110	(79)	346	183
Ending balance	3,476	2,563	3,476	2,563
Ending balance individually evaluated for impairment	201	79	201	79
Ending balance collectively evaluated for impairment	3,275	2,484	3,275	2,484
Financing receivables Ending balance individually evaluated for impairment	2,479	2,199	2,479	2,199
Financing receivables Ending balance collectively evaluated for impairment	461,723	416,047	461,723	416,047
Loans	464,202	418,246	464,202	418,246
Allowance for loan losses	3,384	2,492	3,384	2,492
Reserve for undisbursed lines of credit	92	71	92	71
Total allowance for credit losses	3,476	2,563	3,476	2,563
Real Estate Loans – Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	4,684	4,708	4,484	5,143
Chargeoffs	0	(60)	0	(60)
Recoveries	(1)	0	0	43
Provision (credit)	(126)	208	73	(270)
Ending balance	4,557	4,856	4,557	4,856
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	4,557	4,856	4,557	4,856
Financing receivables Ending balance individually evaluated for impairment	582	656	582	656
Financing receivables Ending balance collectively evaluated for impairment	329,116	303,691	329,116	303,691
Loans	329,698	304,347	329,698	304,347
Allowance for loan losses	4,520	4,796	4,520	4,796
Reserve for undisbursed lines of credit	37	60	37	60
Total allowance for credit losses	4,557	4,856	4,557	4,856
Real Estate Loans – Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	280	248	477	283
Chargeoffs	0	0	0	(11)
Recoveries	5	6	13	11
Provision (credit)	(52)	(61)	(257)	(90)
Ending balance	233	193	233	193
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	233	193	233	193
Financing receivables Ending balance individually evaluated for impairment	0	158	0	158
Financing receivables Ending balance collectively evaluated for impairment	9,875	10,145	9,875	10,145
Loans	9,875	10,303	9,875	10,303
Allowance for loan losses	179	177	179	177
Reserve for undisbursed lines of credit	54	16	54	16
Total allowance for credit losses	233	193	233	193
Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	18	28	23	24
Chargeoffs	0	0	0	(8)
Recoveries	0	1	0	3
Provision (credit)	3	(4)	(2)	6
Ending balance	21	25	21	25
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	21	25	21	25
Financing receivables Ending balance individually evaluated for impairment	0	3	0	3
Financing receivables Ending balance collectively evaluated for impairment	5,842	6,316	5,842	6,316
Loans	5,842	6,319	5,842	6,319
Allowance for loan losses	21	25	21	25
Reserve for undisbursed lines of credit	0	0	0	0
Total allowance for credit losses	21	25	21	25
All Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	1	111	17	23
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Provision (credit)	17	(84)	1	4
Ending balance	18	27	18	27
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	18	27	18	27
Financing receivables Ending balance individually evaluated for impairment	0	0	0	0
Financing receivables Ending balance collectively evaluated for impairment	356	537	356	537
Loans	356	537	356	537
Allowance for loan losses	18	27	18	27
Reserve for undisbursed lines of credit	0	0	0	0
Total allowance for credit losses	$ 18	$ 27	$ 18	$ 27