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		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 8,321	$ 9,093	$ 8,221	$ 8,500	$ 8,500
Charged offs	(505)	(180)	(858)	(210)	(2,927)
Recoveries	78	22	116	145	253
Provision	460	600	875	1,100	2,395
Balance at end of period	8,354	9,535	8,354	9,535	8,221
Amount for loans individually evaluated for impairment	302		302		335
Amount for loans collectively evaluated for impairment	8,052		8,052		7,886
Loans individually evaluated for impairment	7,657		7,657		8,102
Loans collectively evaluated for impairment	768,768		768,768		720,339
Commercial Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	4,268	4,134	3,900	4,260	4,260
Charged offs	(125)	(99)	(150)	(99)	(423)
Recoveries	7		8	1	8
Provision	(106)	(336)	286	(463)	55
Balance at end of period	4,044	3,699	4,044	3,699	3,900
Amount for loans individually evaluated for impairment	102		102		100
Amount for loans collectively evaluated for impairment	3,942		3,942		3,800
Loans individually evaluated for impairment	2,588		2,588		2,676
Loans collectively evaluated for impairment	299,478		299,478		282,808
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,321	1,220	1,321	1,237	1,237
Charged offs	(23)	(1)	(40)	(6)	(123)
Recoveries	2	3	8	79	82
Provision	(64)	396	(53)	308	125
Balance at end of period	1,236	1,618	1,236	1,618	1,321
Amount for loans individually evaluated for impairment	100		100		135
Amount for loans collectively evaluated for impairment	1,136		1,136		1,186
Loans individually evaluated for impairment	636		636		1,078
Loans collectively evaluated for impairment	69,363		69,363		61,372
Commercial Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	485	1,181	594	999	999
Charged offs					(1,943)
Recoveries					77
Provision	48	474	(61)	656	1,461
Balance at end of period	533	1,655	533	1,655	594
Amount for loans individually evaluated for impairment	100		100		100
Amount for loans collectively evaluated for impairment	433		433		494
Loans individually evaluated for impairment	3,753		3,753		3,753
Loans collectively evaluated for impairment	21,353		21,353		26,307
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	336	249	332	223	223
Charged offs	(132)		(142)
Recoveries	55	11	80	45	45
Provision	64	87	53	79	64
Balance at end of period	323	347	323	347	332
Amount for loans collectively evaluated for impairment	323		323		332
Loans individually evaluated for impairment	680		680		595
Loans collectively evaluated for impairment	25,526		25,526		25,985
Residential Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,286	1,514	1,436	1,322	1,322
Charged offs	(32)	(59)	(214)	(77)	(254)
Provision	212	(19)	244	191	368
Balance at end of period	1,466	1,436	1,466	1,436	1,436
Amount for loans collectively evaluated for impairment	1,466		1,466		1,436
Loans collectively evaluated for impairment	267,921		267,921		239,799
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	318	364	286	73	73
Charged offs	(101)	(21)	(220)	(28)	(90)
Recoveries	14	8	20	20	41
Provision	62	(47)	207	239	262
Balance at end of period	293	304	293	304	286
Amount for loans collectively evaluated for impairment	293		293		286
Loans collectively evaluated for impairment	19,988		19,988		22,906
Home Equity Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	251	298	266	276	276
Charged offs	(92)		(92)		(94)
Provision	185	32	170	54	84
Balance at end of period	344	330	344	330	266
Amount for loans collectively evaluated for impairment	344		344		266
Loans collectively evaluated for impairment	52,104		52,104		51,462
Tax Exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	56	133	86	110	110
Provision	59	13	29	36	(24)
Balance at end of period	115	146	115	146	86
Amount for loans collectively evaluated for impairment	115		115		86
Loans collectively evaluated for impairment	$ 13,035		$ 13,035		$ 9,700