Loans - Receivables Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 1,987	$ 3,274
90 Days Past Due and Still Accruing	72	359
Non- Accrual Loans	1,090	2,201
Current	1,355,489	1,332,851
Total Loans	1,357,476	1,336,125
Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	103	182
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	83	90
Current	285,869	251,484
Total Loans	285,972	251,666
Commercial real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	753,040	760,848
Commercial real estate | Construction and land development
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	27	36
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	27	36
Current	97,213	123,111
Total Loans	97,240	123,147
Commercial real estate | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	239	855
90 Days Past Due and Still Accruing	0	280
Non- Accrual Loans	197	489
Current	655,561	636,846
Total Loans	655,800	637,701
Residential
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Loans	313,371	319,183
Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	1,344	1,775
90 Days Past Due and Still Accruing	72	79
Non- Accrual Loans	659	1,343
Current	208,094	207,551
Total Loans	209,438	209,326
Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	250	400
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	124	243
Current	103,683	109,457
Total Loans	103,933	109,857
Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	24	26
90 Days Past Due and Still Accruing	0	0
Non- Accrual Loans	0	0
Current	5,069	4,402
Total Loans	5,093	4,428
30- 59 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	665	622
30- 59 Days Past Due | Commercial
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	20	92
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	42	86
30- 59 Days Past Due | Residential | Real estate
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	456	282
30- 59 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	126	141
30- 59 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	21	21
60-89 Days Past Due
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	160	92
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	157	71
60-89 Days Past Due | Residential | Home equity
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	0	16
60-89 Days Past Due | Consumer
Analysis by portfolio segment of the entity's past due loans [Abstract]
Total Past Due	$ 3	$ 5