Loan Credit Quality Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	$ 446,557	$ 443,362
Financing Receivable, Recorded Investment, Special Mention	4,028	2,192
Financing Receivable Recorded Investment, Substandard Accruing	5,565	5,651
Financing Receivable, Recorded Investment, Nonaccrual Status	1,104	2,972
Loans and Leases Receivable, Gross, Carrying Amount	457,254	454,177	$ 437,920
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	52,197	58,842
Financing Receivable, Recorded Investment, Special Mention	506	94
Financing Receivable Recorded Investment, Substandard Accruing	218	119
Financing Receivable, Recorded Investment, Nonaccrual Status	0	31
Loans and Leases Receivable, Gross, Carrying Amount	52,921	59,086	50,974
Construction And Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	41,892	39,049
Financing Receivable, Recorded Investment, Special Mention	90	90
Financing Receivable Recorded Investment, Substandard Accruing	657	468
Financing Receivable, Recorded Investment, Nonaccrual Status	36	0
Loans and Leases Receivable, Gross, Carrying Amount	42,675	39,607	46,386
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	44,548	43,615
Financing Receivable, Recorded Investment, Special Mention	391	240
Financing Receivable Recorded Investment, Substandard Accruing	327	337
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Loans and Leases Receivable, Gross, Carrying Amount	45,266	44,192
Commercial Real Estate Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	40,497	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	40,497	52,167
Commercial Real Estate Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	158,644	139,695
Financing Receivable, Recorded Investment, Special Mention	629	395
Financing Receivable Recorded Investment, Substandard Accruing	383	396
Financing Receivable, Recorded Investment, Nonaccrual Status	710	2,188
Loans and Leases Receivable, Gross, Carrying Amount	160,366	142,674
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	243,689	235,477
Financing Receivable, Recorded Investment, Special Mention	1,020	635
Financing Receivable Recorded Investment, Substandard Accruing	710	733
Financing Receivable, Recorded Investment, Nonaccrual Status	710	2,188
Loans and Leases Receivable, Gross, Carrying Amount	246,129	239,033	220,863
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	52,988	54,101
Financing Receivable, Recorded Investment, Special Mention	2,051	1,254
Financing Receivable Recorded Investment, Substandard Accruing	3,290	3,586
Financing Receivable, Recorded Investment, Nonaccrual Status	347	599
Loans and Leases Receivable, Gross, Carrying Amount	58,676	59,540
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	46,082	46,463
Financing Receivable, Recorded Investment, Special Mention	308	53
Financing Receivable Recorded Investment, Substandard Accruing	639	667
Financing Receivable, Recorded Investment, Nonaccrual Status	0	140
Loans and Leases Receivable, Gross, Carrying Amount	47,029	47,323
Residential Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	99,070	100,564
Financing Receivable, Recorded Investment, Special Mention	2,359	1,307
Financing Receivable Recorded Investment, Substandard Accruing	3,929	4,253
Financing Receivable, Recorded Investment, Nonaccrual Status	347	739
Loans and Leases Receivable, Gross, Carrying Amount	105,705	106,863	110,288
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Pass	9,709	9,430
Financing Receivable, Recorded Investment, Special Mention	53	66
Financing Receivable Recorded Investment, Substandard Accruing	51	78
Financing Receivable, Recorded Investment, Nonaccrual Status	11	14
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,824	$ 9,588	$ 9,409