Loans And Allowance For Loan Losses (Schedule Of Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 9,891	$ 9,099	$ 9,439	$ 8,969	$ 8,969
Charged off	(120)	(585)	(383)	(1,543)	(1,619)
Recoveries	193	98	293	291	304
Provision	139	425	754	1,320	1,785
Ending Balance	10,103	9,037	10,103	9,037	9,439
Amount for loans individually evaluated for impairment	371	291	371	291	373
Amount for loans collectively evaluated for impairment	9,732	8,746	9,732	8,746	9,066
Loans individually evaluated for impairment	6,831	5,470	6,831	5,470	5,739
Loans collectively evaluated for impairment	1,081,579	970,433	1,081,579	970,433	984,227
Commercial Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,665	4,289	4,246	4,468	4,468
Charged off	(99)	(461)	(133)	(667)	(667)
Recoveries	22	58	35	97	98
Provision	321	600	761	588	347
Ending Balance	4,909	4,486	4,909	4,486	4,246
Amount for loans individually evaluated for impairment	40	39	40	39	43
Amount for loans collectively evaluated for impairment	4,869	4,447	4,869	4,447	4,203
Loans individually evaluated for impairment	3,967	1,988	3,967	1,988	2,223
Loans collectively evaluated for impairment	383,871	370,529	383,871	370,529	368,779
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,267	1,147	1,236	929	929
Charged off		(22)	(90)	(310)	(323)
Recoveries	151	31	155	33	36
Provision	(85)	(49)	32	455	594
Ending Balance	1,333	1,107	1,333	1,107	1,236
Amount for loans individually evaluated for impairment	174	176	174	176	175
Amount for loans collectively evaluated for impairment	1,159	931	1,159	931	1,061
Loans individually evaluated for impairment	355	437	355	437	426
Loans collectively evaluated for impairment	97,253	77,451	97,253	77,451	79,485
Commercial Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	195	145	184	145	145
Charged off
Recoveries
Provision	(53)	(12)	(42)	(12)	39
Ending Balance	142	133	142	133	184
Amount for loans individually evaluated for impairment	60	24	60	24	58
Amount for loans collectively evaluated for impairment	82	109	82	109	126
Loans individually evaluated for impairment	637	1,260	637	1,260	1,111
Loans collectively evaluated for impairment	15,232	23,894	15,232	23,894	23,815
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	383	372	307	277	277
Charged off		(54)		(72)	(72)
Recoveries	5	3	45	15	18
Provision	(34)	28	2	129	84
Ending Balance	354	349	354	349	307
Amount for loans collectively evaluated for impairment	354	349	354	349	307
Loans individually evaluated for impairment	122	108	122	108	106
Loans collectively evaluated for impairment	32,313	32,412	32,313	32,412	30,897
Residential Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,683	2,485	2,747	2,714	2,714
Charged off	(19)		(141)	(70)	(70)
Recoveries	8		36	129	129
Provision	8	(182)	38	(470)	(26)
Ending Balance	2,680	2,303	2,680	2,303	2,747
Amount for loans individually evaluated for impairment	87	52	87	52	97
Amount for loans collectively evaluated for impairment	2,593	2,251	2,593	2,251	2,650
Loans individually evaluated for impairment	1,718	1,650	1,718	1,650	1,847
Loans collectively evaluated for impairment	482,629	389,418	482,629	389,418	404,805
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	100	110	111	94	94
Charged off	(2)	(23)	(19)	(48)	(111)
Recoveries	4	6	17	17	22
Provision	16	11	9	41	106
Ending Balance	118	104	118	104	111
Amount for loans collectively evaluated for impairment	118	104	118	104	111
Loans individually evaluated for impairment	16	9	16	9	8
Loans collectively evaluated for impairment	6,548	10,138	6,548	10,138	9,690
Home Equity Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	547	472	561	271	271
Charged off		(25)		(376)	(376)
Recoveries	3		5		1
Provision	(35)	34	(51)	586	665
Ending Balance	515	481	515	481	561
Amount for loans individually evaluated for impairment	10		10
Amount for loans collectively evaluated for impairment	505	481	505	481	561
Loans individually evaluated for impairment	16	18	16	18	18
Loans collectively evaluated for impairment	47,624	51,272	47,624	51,272	51,512
Tax Exempt [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	51	79	47	71	71
Charged off
Recoveries
Provision	1	(5)	5	3	(24)
Ending Balance	52	74	52	74	47
Amount for loans collectively evaluated for impairment	52	74	52	74	47
Loans collectively evaluated for impairment	$ 16,109	$ 15,319	$ 16,109	$ 15,319	$ 15,244

A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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