Loans Past Due Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	$ 455,012	$ 450,082
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	1,138	1,123
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	456,150	451,205
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	52,813	59,047
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	108	8
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	52,921	59,055
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	42,501	39,607
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	138	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	42,639	39,607
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	45,266	44,192
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	45,266	44,192
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	40,497	52,167
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	40,497	52,167
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	159,656	140,486
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	159,656	140,486
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	245,419	236,845
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	245,419	236,845
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	57,740	58,195
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	589	746
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	58,329	58,941
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	46,733	46,871
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	296	312
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	47,029	47,183
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	104,473	105,066
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	885	1,058
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	105,358	106,124
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, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	9,806	9,517
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	7	57
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	9,813	9,574
Financing Receivable, Recorded Investment, Nonaccrual Status	11	14
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,824	$ 9,588	$ 9,409