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Allowance for Loan Losses (Allowance for Loan Losses By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 4,959	$ 5,080	$ 5,488
Charge-Offs	(607)	(456)	(1,483)
Recoveries	341	562	725
(Recovery of) Provision for loan losses	(188)	(227)	350
Ending Balance	4,505	4,959	5,080
Ending balance: Individually evaluated for impairment	385	576	643
Ending balance: collectively evaluated for impairment	4,120	4,383	4,437
Loans: Ending balance	516,942	495,573	469,820
Ending balance individually evaluated for impairment	13,380	14,003	17,037
Ending balance collectively evaluated for impairment	503,562	481,570	452,783
Construction And Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	775	951	1,032
Charge-Offs	0	(166)	(482)
Recoveries	144	75	26
(Recovery of) Provision for loan losses	(469)	(85)	375
Ending Balance	450	775	951
Ending balance: Individually evaluated for impairment	0	10	93
Ending balance: collectively evaluated for impairment	450	765	858
Loans: Ending balance	31,791	41,569	36,489
Ending balance individually evaluated for impairment	1,320	1,392	2,665
Ending balance collectively evaluated for impairment	30,471	40,177	33,824
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	2,322	1,977	2,225
Charge-Offs	(535)	(152)	(808)
Recoveries	124	142	63
(Recovery of) Provision for loan losses	81	355	497
Ending Balance	1,992	2,322	1,977
Ending balance: Individually evaluated for impairment	268	423	303
Ending balance: collectively evaluated for impairment	1,724	1,899	1,674
Loans: Ending balance	231,532	233,626	227,710
Ending balance individually evaluated for impairment	8,608	7,209	6,550
Ending balance collectively evaluated for impairment	222,924	226,417	221,160
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,268	1,347	1,337
Charge-Offs	0	(47)	(83)
Recoveries	8	115	381
(Recovery of) Provision for loan losses	246	(147)	(288)
Ending Balance	1,522	1,268	1,347
Ending balance: Individually evaluated for impairment	102	141	203
Ending balance: collectively evaluated for impairment	1,420	1,127	1,144
Loans: Ending balance	208,525	175,172	161,299
Ending balance individually evaluated for impairment	2,864	4,555	5,716
Ending balance collectively evaluated for impairment	205,661	170,617	155,583
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	211	464	555
Charge-Offs	0	0	0
Recoveries	11	181	164
(Recovery of) Provision for loan losses	13	(434)	(255)
Ending Balance	235	211	464
Ending balance: Individually evaluated for impairment	15	2	44
Ending balance: collectively evaluated for impairment	220	209	420
Loans: Ending balance	30,341	29,366	28,132
Ending balance individually evaluated for impairment	581	847	2,106
Ending balance collectively evaluated for impairment	29,760	28,519	26,026
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	109	103	102
Charge-Offs	(30)	(66)	(86)
Recoveries	49	33	87
(Recovery of) Provision for loan losses	(59)	39	0
Ending Balance	69	109	103
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	69	109	103
Loans: Ending balance	12,677	13,530	13,874
Ending balance individually evaluated for impairment	7	0	0
Ending balance collectively evaluated for impairment	12,670	13,530	13,874
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	53	42	82
Charge-Offs	(42)	(25)	(24)
Recoveries	5	16	4
(Recovery of) Provision for loan losses	6	20	(20)
Ending Balance	22	53	42
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	22	53	42
Loans: Ending balance	2,076	2,310	2,316
Ending balance individually evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	2,076	2,310	2,316
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	221	196	155
Charge-Offs	0	0	0
Recoveries	0	0	0
(Recovery of) Provision for loan losses	(6)	25	41
Ending Balance	215	221	196
Ending balance: Individually evaluated for impairment		0	0
Ending balance: collectively evaluated for impairment	215	221	196
Loans: Ending balance	0	0	0
Ending balance individually evaluated for impairment		$ 0	$ 0
Ending balance collectively evaluated for impairment	$ 0

X

- Definition

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

+ References

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)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

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)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

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

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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 (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: 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)
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