Loans - Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 5,760	$ 5,438
90 Days Plus Past Due and Still Accruing	1,611	587
Non- Accrual Loans	2,117	2,965
Current	1,282,933	1,159,383
Total Loans	1,288,693	1,164,821	[1]
Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	341	69
90 Days Plus Past Due and Still Accruing	140	0
Non- Accrual Loans	25	19
Current	236,077	208,648
Total Loans	236,418	208,717
Commercial real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	722,415	625,218
Commercial real estate | Construction and land development
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	551	136
90 Days Plus Past Due and Still Accruing	241	0
Non- Accrual Loans	61	64
Current	131,771	114,122
Total Loans	132,322	114,258
Commercial real estate | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,515	1,239
90 Days Plus Past Due and Still Accruing	278	339
Non- Accrual Loans	811	773
Current	588,578	509,721
Total Loans	590,093	510,960
Residential
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	324,885	325,855
Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	3,038	3,447
90 Days Plus Past Due and Still Accruing	952	248
Non- Accrual Loans	1,012	1,802
Current	208,267	211,657
Total Loans	211,305	215,104
Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	280	518
90 Days Plus Past Due and Still Accruing	0	0
Non- Accrual Loans	201	289
Current	113,300	110,233
Total Loans	113,580	110,751
Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	35	29
90 Days Plus Past Due and Still Accruing	0	0
Non- Accrual Loans	7	18
Current	4,940	5,002
Total Loans	4,975	5,031
30- 59 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,776	1,625
30- 59 Days Past Due | Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	67	50
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	249	60
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	426	0
30- 59 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	942	1,280
30- 59 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	71	229
30- 59 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	21	6
60-89 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	256	261
60-89 Days Past Due | Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	109	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	12
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	127
60-89 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	132	117
60-89 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	8	0
60-89 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 7	$ 5

[1] Derived from audited consolidated financial statements.