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Allowance for Loan Losses (Allowance for Loan Losses By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 4,505	$ 4,959	$ 5,080
Charge-Offs	(370)	(607)	(456)
Recoveries	901	341	562
(Recovery of) loan losses	(625)	(188)	(227)
Ending Balance	4,411	4,505	4,959
Ending balance: Individually evaluated for impairment	458	385	576
Ending balance: collectively evaluated for impairment	3,953	4,120	4,383
Loans: Ending balance	569,238	517,125	495,676
Ending balance individually evaluated for impairment	11,426	13,380	14,003
Ending balance collectively evaluated for impairment	557,812	503,745	481,673
Construction And Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	450	775	951
Charge-Offs	(19)	0	(166)
Recoveries	535	144	75
(Recovery of) loan losses	(634)	(469)	(85)
Ending Balance	332	450	775
Ending balance: Individually evaluated for impairment	0	0	10
Ending balance: collectively evaluated for impairment	332	450	765
Loans: Ending balance	52,354	31,791	41,569
Ending balance individually evaluated for impairment	315	1,320	1,392
Ending balance collectively evaluated for impairment	52,039	30,471	40,177
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,992	2,322	1,977
Charge-Offs	(55)	(535)	(152)
Recoveries	212	124	142
(Recovery of) loan losses	(395)	81	355
Ending Balance	1,754	1,992	2,322
Ending balance: Individually evaluated for impairment	195	268	423
Ending balance: collectively evaluated for impairment	1,559	1,724	1,899
Loans: Ending balance	227,305	231,532	233,626
Ending balance individually evaluated for impairment	8,315	8,608	7,209
Ending balance collectively evaluated for impairment	218,990	222,924	226,417
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,522	1,268	1,347
Charge-Offs	(1)	0	(47)
Recoveries	65	8	115
(Recovery of) loan losses	41	246	(147)
Ending Balance	1,627	1,522	1,268
Ending balance: Individually evaluated for impairment	59	102	141
Ending balance: collectively evaluated for impairment	1,568	1,420	1,127
Loans: Ending balance	239,915	208,525	175,172
Ending balance individually evaluated for impairment	1,904	2,864	4,555
Ending balance collectively evaluated for impairment	238,011	205,661	170,617
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	235	211	464
Charge-Offs	(187)	0	0
Recoveries	44	11	181
(Recovery of) loan losses	478	13	(434)
Ending Balance	570	235	211
Ending balance: Individually evaluated for impairment	195	15	2
Ending balance: collectively evaluated for impairment	375	220	209
Loans: Ending balance	37,427	30,341	29,366
Ending balance individually evaluated for impairment	858	581	847
Ending balance collectively evaluated for impairment	36,569	29,760	28,519
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	69	109	103
Charge-Offs	(59)	(30)	(66)
Recoveries	40	49	33
(Recovery of) loan losses	19	(59)	39
Ending Balance	69	69	109
Ending balance: Individually evaluated for impairment	9	0	0
Ending balance: collectively evaluated for impairment	60	69	109
Loans: Ending balance	10,187	12,677	13,530
Ending balance individually evaluated for impairment	34	7	0
Ending balance collectively evaluated for impairment	10,153	12,670	13,530
All Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	22	53	42
Charge-Offs	(49)	(42)	(25)
Recoveries	5	5	16
(Recovery of) loan losses	51	6	20
Ending Balance	29	22	53
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	29	22	53
Loans: Ending balance	2,050	2,259	2,413
Ending balance individually evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	2,050	2,259	2,413
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	215	221	196
Charge-Offs	0	0	0
Recoveries	0	0	0
(Recovery of) loan losses	(185)	(6)	25
Ending Balance	30	215	221
Ending balance: Individually evaluated for impairment		0	0
Ending balance: collectively evaluated for impairment	30	215	221
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=84173941&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=84173941&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=84173941&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=84173941&loc=SL6953423-111524

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- Definition

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=84173941&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=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

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=82891408&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)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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