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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	$ 11,817	$ 10,901	$ 11,353	$ 10,754
Chargeoffs	0	(103)	(29)	(308)
Recoveries	13	41	56	143
Provision (credit)	250	250	700	500
Ending balance	12,080	11,089	12,080	11,089
Ending balance individually evaluated for impairment	334	254	334	254
Ending balance collectively evaluated for impairment	11,746	10,835	11,746	10,835
Financing receivables Ending balance individually evaluated for impairment	2,740	3,192	2,740	3,192
Financing receivables Ending balance collectively evaluated for impairment	1,070,139	1,004,884	1,070,139	1,004,884
Loans	1,072,879	1,008,076	1,072,879	1,008,076	1,027,626
Allowance for loan losses	11,444	10,480	11,444	10,480	10,619
Reserve for undisbursed lines of credit	636	609	636	609
Total allowance for credit losses	12,080	11,089	12,080	11,089
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	3,102	3,122	2,905	2,617
Chargeoffs	0	(2)	(9)	(79)
Recoveries	3	32	21	76
Provision (credit)	136	(274)	324	264
Ending balance	3,241	2,878	3,241	2,878
Ending balance individually evaluated for impairment	4	39	4	39
Ending balance collectively evaluated for impairment	3,237	2,839	3,237	2,839
Financing receivables Ending balance individually evaluated for impairment	20	223	20	223
Financing receivables Ending balance collectively evaluated for impairment	169,430	155,820	169,430	155,820
Loans	169,450	156,043	169,450	156,043	146,990
Allowance for loan losses	2,795	2,448	2,795	2,448
Reserve for undisbursed lines of credit	446	430	446	430
Total allowance for credit losses	3,241	2,878	3,241	2,878
Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	410	115	309	236
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Provision (credit)	31	182	132	61
Ending balance	441	297	441	297
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	441	297	441	297
Financing receivables Ending balance individually evaluated for impairment	0	0	0	0
Financing receivables Ending balance collectively evaluated for impairment	82,048	97,015	82,048	97,015
Loans	82,048	97,015	82,048	97,015	101,705
Allowance for loan losses	435	295	435	295
Reserve for undisbursed lines of credit	6	2	6	2
Total allowance for credit losses	441	297	441	297
Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	3,476	2,563	3,138	2,428
Chargeoffs	0	(14)	(20)	(63)
Recoveries	1	2	13	3
Provision (credit)	85	678	431	861
Ending balance	3,562	3,229	3,562	3,229
Ending balance individually evaluated for impairment	270	215	270	215
Ending balance collectively evaluated for impairment	3,292	3,014	3,292	3,014
Financing receivables Ending balance individually evaluated for impairment	2,132	2,380	2,132	2,380
Financing receivables Ending balance collectively evaluated for impairment	475,189	423,240	475,189	423,240
Loans	477,321	425,620	477,321	425,620
Allowance for loan losses	3,472	3,131	3,472	3,131
Reserve for undisbursed lines of credit	90	98	90	98
Total allowance for credit losses	3,562	3,229	3,562	3,229
Real Estate Loans – Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	4,557	4,856	4,484	5,143
Chargeoffs	0	0	0	(60)
Recoveries	1	0	1	43
Provision (credit)	3	(507)	76	(777)
Ending balance	4,561	4,349	4,561	4,349
Ending balance individually evaluated for impairment	60	0	60	0
Ending balance collectively evaluated for impairment	4,501	4,349	4,501	4,349
Financing receivables Ending balance individually evaluated for impairment	581	588	581	588
Financing receivables Ending balance collectively evaluated for impairment	326,601	310,275	326,601	310,275
Loans	327,182	310,863	327,182	310,863
Allowance for loan losses	4,502	4,306	4,502	4,306
Reserve for undisbursed lines of credit	59	43	59	43
Total allowance for credit losses	4,561	4,349	4,561	4,349
Real Estate Loans – Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	233	193	477	283
Chargeoffs	0	(85)	0	(96)
Recoveries	8	7	21	18
Provision (credit)	(10)	175	(267)	85
Ending balance	231	290	231	290
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	231	290	231	290
Financing receivables Ending balance individually evaluated for impairment	0	0	0	0
Financing receivables Ending balance collectively evaluated for impairment	11,285	12,238	11,285	12,238
Loans	11,285	12,238	11,285	12,238
Allowance for loan losses	196	254	196	254
Reserve for undisbursed lines of credit	35	36	35	36
Total allowance for credit losses	231	290	231	290
Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	21	25	23	24
Chargeoffs	0	(2)	0	(10)
Recoveries	0	0	0	3
Provision (credit)	(2)	0	(4)	6
Ending balance	19	23	19	23
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	19	23	19	23
Financing receivables Ending balance individually evaluated for impairment	7	1	7	1
Financing receivables Ending balance collectively evaluated for impairment	5,252	5,857	5,252	5,857
Loans	5,259	5,858	5,259	5,858
Allowance for loan losses	19	23	19	23
Reserve for undisbursed lines of credit	0	0	0	0
Total allowance for credit losses	19	23	19	23
All Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Beginning balance	18	27	17	23
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Provision (credit)	7	(4)	8	0
Ending balance	25	23	25	23
Ending balance individually evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	25	23	25	23
Financing receivables Ending balance individually evaluated for impairment	0	0	0	0
Financing receivables Ending balance collectively evaluated for impairment	334	439	334	439
Loans	334	439	334	439
Allowance for loan losses	25	23	25	23
Reserve for undisbursed lines of credit	0	0	0	0
Total allowance for credit losses	$ 25	$ 23	$ 25	$ 23