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Loans and Allowance - Risk Ratings of Loans by Categories of Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Total	$ 271,612	$ 265,058
Non-accrual	3,270	3,751	$ 3,780
Troubled debt restructures	$ 263	$ 312
Number of TDRs accounts | contract	2	3
Non-performing TDRs
Financing Receivable, Recorded Investment [Line Items]
Troubled debt restructures	$ 46	$ 84
Number of TDRs accounts | contract	1	2
Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 269,217	$ 259,128
Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	1,776	5,436
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	554	340
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	65	154
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total	16,112	14,739
Non-accrual	185	403	623
Troubled debt restructures	$ 46	$ 84
Number of TDRs accounts | contract	1	2
Consumer | Non-performing TDRs
Financing Receivable, Recorded Investment [Line Items]
Troubled debt restructures	$ 46	$ 84
Number of TDRs accounts | contract	1	2
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 16,008	$ 14,597
Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	77	29
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	3	64
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	24	49
Residential Real estate
Financing Receivable, Recorded Investment [Line Items]
Total	81,926	93,468
Non-accrual	2,124	2,508	2,508
Residential Real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	81,346	93,045
Residential Real estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	344	423
Residential Real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	236
Indirect
Financing Receivable, Recorded Investment [Line Items]
Total	85,186	71,656
Non-accrual	88	193	349
Indirect | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	83,803	70,188
Indirect | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	1,027	1,087
Indirect | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	315	276
Indirect | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	41	105
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total	11,257	12,351
Non-accrual	48
Troubled debt restructures	$ 217	$ 229
Number of TDRs accounts | contract	1	1
Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 11,256	$ 12,255
Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	1	95
Construction
Financing Receivable, Recorded Investment [Line Items]
Total	3,536	4,397
Non-accrual	318
Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	3,536	4,397
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total	73,595	68,447
Non-accrual	507	647	$ 300
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	73,268	64,646
Commercial Real Estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	$ 327	$ 3,801

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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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=82891408&loc=d3e4428-111522

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