Loans - Receivables Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 5,438	$ 7,176
90 Days Past Due and Still Accruing	587	91
Non- Accrual Loans	2,965	5,114
Current	1,159,383	998,349
Total Loans	1,164,821	1,005,525
Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	69	227
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	19	90
Current	208,648	177,254
Total Loans	208,717	177,481
Commercial real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	625,218	503,154
Commercial real estate | Construction and land development
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	136	258
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	64	258
Current	114,122	72,710
Total Loans	114,258	72,968
Commercial real estate | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,239	2,814
90 Days Past Due and Still Accruing	339	0
Non- Accrual Loans	773	2,497
Current	509,721	427,372
Total Loans	510,960	430,186
Residential
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	325,855	318,883
Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	3,447	3,042
90 Days Past Due and Still Accruing	248	84
Non- Accrual Loans	1,802	1,647
Current	211,657	217,392
Total Loans	215,104	220,434
Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	518	772
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	289	620
Current	110,233	97,677
Total Loans	110,751	98,449
Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	29	63
90 Days Past Due and Still Accruing	0	7
Non- Accrual Loans	18	2
Current	5,002	5,944
Total Loans	5,031	6,007
30- 59 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,625	1,378
30- 59 Days Past Due | Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	50	137
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	60	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	0	135
30- 59 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,280	913
30- 59 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	229	140
30- 59 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	6	53
60-89 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	261	593
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	12	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	127	182
60-89 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	117	398
60-89 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	0	12
60-89 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 5	$ 1