Loans And Allowance For Loan Losses (Schedule Of Allowance For Loan Losses By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 8,354	$ 9,535	$ 8,221	$ 8,500	$ 8,500
Charged offs	(753)	(2,194)	(1,611)	(2,404)	(2,927)
Recoveries	25	62	141	207	253
Provision	427	750	1,302	1,850	(2,395)
Ending Balance	8,053	8,153	8,053	8,153	8,221
Amount for loans individually evaluated for impairment	302		302		335
Amount for loans collectively evaluated for impairment	7,751		7,751		7,886
Loans individually evaluated for impairment	6,713		6,713		8,102
Loans collectively evaluated for impairment	802,292		802,292		720,339
Commercial Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,044	3,699	3,900	4,260	4,260
Charged offs	(102)		(252)	(99)	(423)
Recoveries	1	6	9	7	8
Provision	100	277	386	(186)	(55)
Ending Balance	4,043	3,982	4,043	3,982	3,900
Amount for loans individually evaluated for impairment	102		102		100
Amount for loans collectively evaluated for impairment	3,941		3,941		3,800
Loans individually evaluated for impairment	2,929		2,929		2,676
Loans collectively evaluated for impairment	295,855		295,855		282,808
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,236	1,618	1,321	1,237	1,237
Charged offs	(2)	(42)	(42)	(48)	(123)
Recoveries	1	2	9	81	82
Provision	118	(81)	65	227	(125)
Ending Balance	1,353	1,497	1,353	1,497	1,321
Amount for loans individually evaluated for impairment	100		100		135
Amount for loans collectively evaluated for impairment	1,253		1,253		1,186
Loans individually evaluated for impairment	589		589		1,078
Loans collectively evaluated for impairment	78,034		78,034		61,372
Commercial Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	533	1,655	594	999	999
Charged offs	(300)	(1,993)	(300)	(1,993)	(1,943)
Recoveries					77
Provision	187	738	126	1,394	(1,461)
Ending Balance	420	400	420	400	594
Amount for loans individually evaluated for impairment	100		100		100
Amount for loans collectively evaluated for impairment	320		320		494
Loans individually evaluated for impairment	2,599		2,599		3,753
Loans collectively evaluated for impairment	22,507		22,507		26,307
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	323	347	332	223	223
Charged offs	(6)		(148)
Recoveries	1		81	45	45
Provision	(5)	(17)	48	62	(64)
Ending Balance	313	330	313	330	332
Amount for loans collectively evaluated for impairment	313		313		332
Loans individually evaluated for impairment	596		596		595
Loans collectively evaluated for impairment	25,610		25,610		25,985
Residential Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,466	1,436	1,436	1,322	1,322
Charged offs	(300)	(101)	(514)	(178)	(254)
Recoveries	14	40	14	40
Provision	119	(75)	363	116	(368)
Ending Balance	1,299	1,300	1,299	1,300	1,436
Amount for loans collectively evaluated for impairment	1,299		1,299		1,436
Loans collectively evaluated for impairment	292,122		292,122		239,799
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	293	304	286	73	73
Charged offs	(43)	(2)	(263)	(30)	(90)
Recoveries	8	14	28	34	41
Provision	4	(42)	211	197	(262)
Ending Balance	262	274	262	274	286
Amount for loans collectively evaluated for impairment	262		262		286
Loans collectively evaluated for impairment	19,678		19,678		22,906
Home Equity Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	344	330	266	276	276
Charged offs		(56)	(92)	(56)	(94)
Provision	(36)	(10)	134	44	(84)
Ending Balance	308	264	308	264	266
Amount for loans collectively evaluated for impairment	308		308		266
Loans collectively evaluated for impairment	53,044		53,044		51,462
Tax Exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	115	146	86	110	110
Provision	(60)	(40)	(31)	(4)	24
Ending Balance	55	106	55	106	86
Amount for loans collectively evaluated for impairment	55		55		86
Loans collectively evaluated for impairment	$ 15,442		$ 15,442		$ 9,700