Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of principal business segments | Segment			3
Revenue benchmark no single customer equals of exceeds			10.00%
Revenues [Abstract]
Interest and dividend income	$ 9,594	$ 8,061	$ 18,393	$ 15,786
Total operating income	13,241	12,152	25,395	23,040
Expenses [Abstract]
Interest expense	1,168	673	2,222	1,261
Provision for loan losses	575	1,000	1,100	1,650	$ 4,160
Salaries and employee benefits	5,935	5,449	11,412	10,546
Other expenses	4,506	3,821	8,658	7,430
Total operating expenses	12,184	10,943	23,392	20,887
Income before income taxes	1,057	1,209	2,003	2,153
Income tax expense (benefit)	65	48	69	50
Net income	992	1,161	1,934	2,103
Capital expenditures	128	195	317	444
Total assets	1,032,130	952,518	1,032,130	952,518	$ 981,826
Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	916	951	1,899	1,917
Other Income [Member]
Revenues [Abstract]
Noninterest revenue	2,731	3,140	5,103	5,337
Operating Segments [Member] | Bank [Member]
Revenues [Abstract]
Interest and dividend income	9,571	8,043	18,348	15,751
Total operating income	12,026	10,946	22,930	20,609
Expenses [Abstract]
Interest expense	1,135	672	2,189	1,260
Provision for loan losses	575	1,000	1,100	1,650
Salaries and employee benefits	5,076	4,654	9,702	8,909
Other expenses	3,782	3,471	7,421	6,796
Total operating expenses	10,568	9,797	20,412	18,615
Income before income taxes	1,458	1,149	2,518	1,994
Income tax expense (benefit)	76	27	51	(5)
Net income	1,382	1,122	2,467	1,999
Capital expenditures	127	195	316	444
Total assets	1,026,571	946,734	1,026,571	946,734
Operating Segments [Member] | Bank [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	0	0	0	0
Operating Segments [Member] | Bank [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	2,455	2,903	4,582	4,858
Operating Segments [Member] | Trust [Member]
Revenues [Abstract]
Interest and dividend income	22	17	43	34
Total operating income	1,199	1,220	2,463	2,461
Expenses [Abstract]
Interest expense	0	0	0	0
Provision for loan losses	0	0	0	0
Salaries and employee benefits	749	684	1,494	1,411
Other expenses	271	249	535	514
Total operating expenses	1,020	933	2,029	1,925
Income before income taxes	179	287	434	536
Income tax expense (benefit)	38	98	92	183
Net income	141	189	342	353
Capital expenditures	1	0	1	0
Total assets	6,110	5,956	6,110	5,956
Operating Segments [Member] | Trust [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	916	951	1,899	1,917
Operating Segments [Member] | Trust [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	261	252	521	510
Operating Segments [Member] | Unconsolidated Parent [Member]
Revenues [Abstract]
Interest and dividend income	1,524	1,311	2,812	2,352
Total operating income	1,604	1,361	2,942	2,452
Expenses [Abstract]
Interest expense	33	0	33	0
Provision for loan losses	0	0	0	0
Salaries and employee benefits	110	111	216	226
Other expenses	518	166	833	251
Total operating expenses	661	277	1,082	477
Income before income taxes	943	1,084	1,860	1,975
Income tax expense (benefit)	(49)	(77)	(74)	(128)
Net income	992	1,161	1,934	2,103
Capital expenditures	0	0	0	0
Total assets	102,239	96,942	102,239	96,942
Operating Segments [Member] | Unconsolidated Parent [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	0	0	0	0
Operating Segments [Member] | Unconsolidated Parent [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	80	50	130	100
Eliminations [Member]
Revenues [Abstract]
Interest and dividend income	(1,523)	(1,310)	(2,810)	(2,351)
Total operating income	(1,588)	(1,375)	(2,940)	(2,482)
Expenses [Abstract]
Interest expense	0	1	0	1
Provision for loan losses	0	0	0	0
Salaries and employee benefits	0	0	0	0
Other expenses	(65)	(65)	(131)	(131)
Total operating expenses	(65)	(64)	(131)	(130)
Income before income taxes	(1,523)	(1,311)	(2,809)	(2,352)
Income tax expense (benefit)	0	0	0	0
Net income	(1,523)	(1,311)	(2,809)	(2,352)
Capital expenditures	0	0	0	0
Total assets	(102,790)	(97,114)	(102,790)	(97,114)
Eliminations [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	0	0	0	0
Eliminations [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	$ (65)	$ (65)	$ (130)	$ (131)