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Loan Credit Quality Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	$ 443,362	$ 419,974
Financing Receivable, Recorded Investment, Special Mention	2,192	3,319
Financing Receivable Recorded Investment, Substandard Accruing	5,651	5,843
Financing Receivable, Recorded Investment, Nonaccrual Status	2,972	2,370
Loans and Leases Receivable, Gross, Carrying Amount	454,177	431,506
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	58,842	49,558
Financing Receivable, Recorded Investment, Special Mention	94	22
Financing Receivable Recorded Investment, Substandard Accruing	119	233
Financing Receivable, Recorded Investment, Nonaccrual Status	31	37
Loans and Leases Receivable, Gross, Carrying Amount	59,086	49,850
Construction And Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	39,049	41,165
Financing Receivable, Recorded Investment, Special Mention	90	113
Financing Receivable Recorded Investment, Substandard Accruing	468	340
Financing Receivable, Recorded Investment, Nonaccrual Status	0	32
Loans and Leases Receivable, Gross, Carrying Amount	39,607	41,650
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	43,615	48,788
Financing Receivable, Recorded Investment, Special Mention	240	414
Financing Receivable Recorded Investment, Substandard Accruing	337	405
Financing Receivable, Recorded Investment, Nonaccrual Status	0	138
Loans and Leases Receivable, Gross, Carrying Amount	44,192	49,745
Commercial Real Estate Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	52,167	46,998
Financing Receivable, Recorded Investment, Special Mention	0	0
Financing Receivable Recorded Investment, Substandard Accruing	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Loans and Leases Receivable, Gross, Carrying Amount	52,167	46,998
Commercial Real Estate Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	139,695	121,326
Financing Receivable, Recorded Investment, Special Mention	395	32
Financing Receivable Recorded Investment, Substandard Accruing	396	449
Financing Receivable, Recorded Investment, Nonaccrual Status	2,188	1,889
Loans and Leases Receivable, Gross, Carrying Amount	142,674	123,696
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	235,477	217,112
Financing Receivable, Recorded Investment, Special Mention	635	446
Financing Receivable Recorded Investment, Substandard Accruing	733	854
Financing Receivable, Recorded Investment, Nonaccrual Status	2,188	2,027
Loans and Leases Receivable, Gross, Carrying Amount	239,033	220,439
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	54,101	59,450
Financing Receivable, Recorded Investment, Special Mention	1,254	2,613
Financing Receivable Recorded Investment, Substandard Accruing	3,586	3,278
Financing Receivable, Recorded Investment, Nonaccrual Status	599	223
Loans and Leases Receivable, Gross, Carrying Amount	59,540	65,564
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	46,463	44,109
Financing Receivable, Recorded Investment, Special Mention	53	105
Financing Receivable Recorded Investment, Substandard Accruing	667	1,048
Financing Receivable, Recorded Investment, Nonaccrual Status	140	29
Loans and Leases Receivable, Gross, Carrying Amount	47,323	45,291
Residential Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	100,564	103,559
Financing Receivable, Recorded Investment, Special Mention	1,307	2,718
Financing Receivable Recorded Investment, Substandard Accruing	4,253	4,326
Financing Receivable, Recorded Investment, Nonaccrual Status	739	252
Loans and Leases Receivable, Gross, Carrying Amount	106,863	110,855
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	9,430	8,580
Financing Receivable, Recorded Investment, Special Mention	66	20
Financing Receivable Recorded Investment, Substandard Accruing	78	90
Financing Receivable, Recorded Investment, Nonaccrual Status	14	22
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,588	$ 8,712

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
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-Section 45
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