Segment Reporting (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Segment Area	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Revenues [Abstract]
Interest and dividend income	$ 9,876	$ 8,799
Total operating income	13,292	11,941
Expenses [Abstract]
Interest expense	1,517	1,054
Provision for loan losses	226	525	$ 2,861
Salaries and employee benefits	5,699	5,477
Other expenses	3,592	3,939
Total operating expenses	11,034	10,995
Income before income taxes	2,258	946
Income tax expense (benefit)	231	4
Net income	2,027	942
Capital expenditures	498	189
Total assets	$ 1,026,880	993,773	$ 1,038,183
Number of principal business segments | Segment	3
Number of geographical areas in which an entity operates | Area	1
Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	$ 959	983
Other Income [Member]
Revenues [Abstract]
Noninterest revenue	2,457	2,159
Operating Segments [Member] | Bank [Member]
Revenues [Abstract]
Interest and dividend income	9,847	8,778
Total operating income	12,035	10,692
Expenses [Abstract]
Interest expense	1,486	1,054
Provision for loan losses	226	525
Salaries and employee benefits	4,818	4,625
Other expenses	3,348	3,426
Total operating expenses	9,878	9,630
Income before income taxes	2,157	1,062
Income tax expense (benefit)	209	(25)
Net income	1,948	1,087
Capital expenditures	498	189
Total assets	1,021,007	987,507
Operating Segments [Member] | Bank [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	0	0
Operating Segments [Member] | Bank [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	2,188	1,914
Operating Segments [Member] | Trust [Member]
Revenues [Abstract]
Interest and dividend income	29	21
Total operating income	1,272	1,264
Expenses [Abstract]
Interest expense	0	0
Provision for loan losses	0	0
Salaries and employee benefits	767	745
Other expenses	249	264
Total operating expenses	1,016	1,009
Income before income taxes	256	255
Income tax expense (benefit)	55	54
Net income	201	201
Capital expenditures	0	0
Total assets	6,310	6,098
Operating Segments [Member] | Trust [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	959	983
Operating Segments [Member] | Trust [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	284	260
Operating Segments [Member] | Unconsolidated Parent [Member]
Revenues [Abstract]
Interest and dividend income	725	1,288
Total operating income	775	1,338
Expenses [Abstract]
Interest expense	31	0
Provision for loan losses	0	0
Salaries and employee benefits	114	107
Other expenses	60	314
Total operating expenses	205	421
Income before income taxes	570	917
Income tax expense (benefit)	(33)	(25)
Net income	603	942
Capital expenditures	0	0
Total assets	107,427	94,998
Operating Segments [Member] | Unconsolidated Parent [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	0	0
Operating Segments [Member] | Unconsolidated Parent [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	50	50
Eliminations [Member]
Revenues [Abstract]
Interest and dividend income	(725)	(1,288)
Total operating income	(790)	(1,353)
Expenses [Abstract]
Interest expense	0	0
Provision for loan losses	0	0
Salaries and employee benefits	0	0
Other expenses	(65)	(65)
Total operating expenses	(65)	(65)
Income before income taxes	(725)	(1,288)
Income tax expense (benefit)	0	0
Net income	(725)	(1,288)
Capital expenditures	0	0
Total assets	(107,864)	(94,830)
Eliminations [Member] | Income from Fiduciary Activities [Member]
Revenues [Abstract]
Noninterest revenue	0	0
Eliminations [Member] | Other Income [Member]
Revenues [Abstract]
Noninterest revenue	$ (65)	$ (65)