Loans - Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 3,281	$ 1,987
90 Days Past Due and Still Accruing	197	72
Non- Accrual Loans	1,111	1,090
Current	1,356,782	1,355,489
Total Loans	1,360,063	1,357,476	[1]
Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,039	103
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	37	83
Current	288,262	285,869
Total Loans	289,301	285,972
Commercial real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	752,892	753,040
Commercial real estate | Construction and land development
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	26	27
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	26	27
Current	93,733	97,213
Total Loans	93,759	97,240
Commercial real estate | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	526	239
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	221	197
Current	658,607	655,561
Total Loans	659,133	655,800
Residential
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	312,644	313,371
Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,418	1,344
90 Days Past Due and Still Accruing	197	72
Non- Accrual Loans	750	659
Current	211,247	208,094
Total Loans	212,665	209,438
Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	251	250
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	76	124
Current	99,728	103,683
Total Loans	99,979	103,933
Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	21	24
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	1	0
Current	5,205	5,069
Total Loans	5,226	5,093
30- 59 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,792	665
30- 59 Days Past Due | Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,002	20
30- 59 Days Past Due | Commercial real estate | Construction and land development
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	0	0
30- 59 Days Past Due | Commercial real estate | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	305	42
30- 59 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	382	456
30- 59 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	84	126
30- 59 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	19	21
60-89 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	181	160
60-89 Days Past Due | Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	0	0
60-89 Days Past Due | Commercial real estate | Construction and land development
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	0	0
60-89 Days Past Due | Commercial real estate | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	0	0
60-89 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	89	157
60-89 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	91	0
60-89 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 1	$ 3

[1] Derived from audited consolidated financial statements.