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Loan Credit Quality Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	$ 432,835	$ 443,362
Financing Receivable, Recorded Investment, Special Mention	2,890	2,192
Financing Receivable Recorded Investment, Substandard Accruing	5,349	5,651
Financing Receivable, Recorded Investment, Nonaccrual Status	3,239	2,972
Loans and Leases Receivable, Gross, Carrying Amount	444,313	454,177	$ 431,193
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	57,169	58,842
Financing Receivable, Recorded Investment, Special Mention	362	94
Financing Receivable Recorded Investment, Substandard Accruing	112	119
Financing Receivable, Recorded Investment, Nonaccrual Status	234	31
Loans and Leases Receivable, Gross, Carrying Amount	57,877	59,086	50,228
Construction And Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	35,371	39,049
Financing Receivable, Recorded Investment, Special Mention	89	90
Financing Receivable Recorded Investment, Substandard Accruing	450	468
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Loans and Leases Receivable, Gross, Carrying Amount	35,910	39,607	45,098
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	42,970	43,615
Financing Receivable, Recorded Investment, Special Mention	161	240
Financing Receivable Recorded Investment, Substandard Accruing	336	337
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Loans and Leases Receivable, Gross, Carrying Amount	43,467	44,192
Commercial Real Estate Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	40,060	52,167
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	40,060	52,167
Commercial Real Estate Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	147,598	139,695
Financing Receivable, Recorded Investment, Special Mention	368	395
Financing Receivable Recorded Investment, Substandard Accruing	389	396
Financing Receivable, Recorded Investment, Nonaccrual Status	2,463	2,188
Loans and Leases Receivable, Gross, Carrying Amount	150,818	142,674
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	230,628	235,477
Financing Receivable, Recorded Investment, Special Mention	529	635
Financing Receivable Recorded Investment, Substandard Accruing	725	733
Financing Receivable, Recorded Investment, Nonaccrual Status	2,463	2,188
Loans and Leases Receivable, Gross, Carrying Amount	234,345	239,033	218,739
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	53,454	54,101
Financing Receivable, Recorded Investment, Special Mention	1,786	1,254
Financing Receivable Recorded Investment, Substandard Accruing	3,344	3,586
Financing Receivable, Recorded Investment, Nonaccrual Status	530	599
Loans and Leases Receivable, Gross, Carrying Amount	59,114	59,540
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	46,682	46,463
Financing Receivable, Recorded Investment, Special Mention	52	53
Financing Receivable Recorded Investment, Substandard Accruing	648	667
Financing Receivable, Recorded Investment, Nonaccrual Status	0	140
Loans and Leases Receivable, Gross, Carrying Amount	47,382	47,323
Residential Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	100,136	100,564
Financing Receivable, Recorded Investment, Special Mention	1,838	1,307
Financing Receivable Recorded Investment, Substandard Accruing	3,992	4,253
Financing Receivable, Recorded Investment, Nonaccrual Status	530	739
Loans and Leases Receivable, Gross, Carrying Amount	106,496	106,863	108,096
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	9,531	9,430
Financing Receivable, Recorded Investment, Special Mention	72	66
Financing Receivable Recorded Investment, Substandard Accruing	70	78
Financing Receivable, Recorded Investment, Nonaccrual Status	12	14
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,685	$ 9,588	$ 9,032

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+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 45
-Paragraph 2
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