Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of principal business segments | Segment			3
Revenues [Abstract]
Interest and dividend income	$ 10,208	$ 9,803	$ 30,217	$ 28,189
Total operating income	13,945	13,187	40,943	38,146
Expenses [Abstract]
Interest expense	1,656	1,299	4,775	3,521
Provision for loan losses	0	749	1,013	1,849	$ 2,861
Salaries and employee benefits	5,991	5,608	17,617	17,020
Other expenses	3,705	3,819	10,878	12,041
Total operating expenses	11,352	11,475	34,283	34,431
Income before income taxes	2,593	1,712	6,660	3,715
Income tax expense (benefit)	361	115	775	184
Net income	2,232	1,597	5,885	3,531
Capital expenditures	616	122	1,295	439
Total assets	1,050,595	1,025,440	1,050,595	1,025,440	$ 1,038,183
Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	949	904	2,837	2,803
Other Income [Member]
Revenues [Abstract]
Noninterest revenue	2,788	2,480	7,889	7,154
Operating Segments [Member] | Bank [Member]
Revenues [Abstract]
Interest and dividend income	10,177	9,777	30,124	28,118
Total operating income	12,750	12,046	37,238	34,540
Expenses [Abstract]
Interest expense	1,629	1,266	4,686	3,455
Provision for loan losses	0	749	1,013	1,849
Salaries and employee benefits	5,099	4,753	14,972	14,455
Other expenses	3,432	3,485	10,039	10,470
Total operating expenses	10,160	10,253	30,710	30,229
Income before income taxes	2,590	1,793	6,528	4,311
Income tax expense (benefit)	359	122	744	173
Net income	2,231	1,671	5,784	4,138
Capital expenditures	614	123	1,269	439
Total assets	1,044,249	1,019,780	1,044,249	1,019,780
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	2,573	2,269	7,114	6,422
Operating Segments [Member] | Trust [Member]
Revenues [Abstract]
Interest and dividend income	32	26	94	69
Total operating income	1,210	1,157	3,751	3,620
Expenses [Abstract]
Interest expense	0	0	0	0
Provision for loan losses	0	0	0	0
Salaries and employee benefits	777	748	2,300	2,242
Other expenses	253	287	760	822
Total operating expenses	1,030	1,035	3,060	3,064
Income before income taxes	180	122	691	556
Income tax expense (benefit)	39	26	148	118
Net income	141	96	543	438
Capital expenditures	2	(1)	26	0
Total assets	6,531	6,084	6,531	6,084
Operating Segments [Member] | Trust [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	949	904	2,837	2,803
Operating Segments [Member] | Trust [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	229	227	820	748
Operating Segments [Member] | Unconsolidated Parent [Member]
Revenues [Abstract]
Interest and dividend income	2,371	1,766	6,326	4,578
Total operating income	2,422	1,816	6,477	4,758
Expenses [Abstract]
Interest expense	27	33	89	66
Provision for loan losses	0	0	0	0
Salaries and employee benefits	115	107	345	323
Other expenses	85	112	275	945
Total operating expenses	227	252	709	1,334
Income before income taxes	2,195	1,564	5,768	3,424
Income tax expense (benefit)	(37)	(33)	(117)	(107)
Net income	2,232	1,597	5,885	3,531
Capital expenditures	0	0	0	0
Total assets	111,188	102,459	111,188	102,459
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	51	50	151	180
Eliminations [Member]
Revenues [Abstract]
Interest and dividend income	(2,372)	(1,766)	(6,327)	(4,576)
Total operating income	(2,437)	(1,832)	(6,523)	(4,772)
Expenses [Abstract]
Interest expense	0	0	0	0
Provision for loan losses	0	0	0	0
Salaries and employee benefits	0	0	0	0
Other expenses	(65)	(65)	(196)	(196)
Total operating expenses	(65)	(65)	(196)	(196)
Income before income taxes	(2,372)	(1,767)	(6,327)	(4,576)
Income tax expense (benefit)	0	0	0	0
Net income	(2,372)	(1,767)	(6,327)	(4,576)
Capital expenditures	0	0	0	0
Total assets	(111,373)	(102,883)	(111,373)	(102,883)
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)	$ (66)	$ (196)	$ (196)