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Allowance for Loan Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 4,750	$ 4,965	$ 4,757	$ 4,643
Financing Receivable, Allowance for Credit Losses, Charge-offs	(18)	(489)	(115)	(573)
Financing Receivable, Allowance for Credit Losses, Recoveries	53	194	143	500
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	35	(295)	28	(73)
Provision for loan losses	0	0	0	100
Financing Receivable, Allowance for Credit Losses	4,785	4,670	4,785	4,670
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	600	677	653	540
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	(449)	(52)	(449)
Financing Receivable, Allowance for Credit Losses, Recoveries	13	39	59	45
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	13	(410)	7	(404)
Provision for loan losses	(69)	237	(116)	368
Financing Receivable, Allowance for Credit Losses	544	504	544	504
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	787	874	734	812
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	133	0	347
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	0	133	0	347
Provision for loan losses	49	(156)	102	(308)
Financing Receivable, Allowance for Credit Losses	836	851	836	851
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	2,197	2,121	2,126	2,071
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0	(39)	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	0	0	(39)	0
Provision for loan losses	44	(60)	154	(10)
Financing Receivable, Allowance for Credit Losses	2,241	2,061	2,241	2,061
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,017	1,119	1,071	1,107
Financing Receivable, Allowance for Credit Losses, Charge-offs	(11)	(30)	(15)	(108)
Financing Receivable, Allowance for Credit Losses, Recoveries	19	20	52	97
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	8	(10)	37	(11)
Provision for loan losses	(28)	(32)	(111)	(19)
Financing Receivable, Allowance for Credit Losses	997	1,077	997	1,077
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	149	174	173	113
Financing Receivable, Allowance for Credit Losses, Charge-offs	(7)	(10)	(9)	(16)
Financing Receivable, Allowance for Credit Losses, Recoveries	21	2	32	11
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	14	(8)	23	(5)
Provision for loan losses	4	11	(29)	69
Financing Receivable, Allowance for Credit Losses	$ 167	$ 177	$ 167	$ 177

X

- References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- 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

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

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.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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