Condensed Financial Information (Parent Company Only) Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Expenses
Administrative and other									$ 7,160	$ 6,664
Applicable income tax benefit									1,830	1,273
Net income	$ 2,759	$ 2,738	$ 2,530	$ 2,621	$ (436)	$ 2,311	$ 2,450	$ 2,747	10,648	7,072
Parent Company [Member]
Revenues
Dividends - bank subsidiary - Union									5,925	5,625
Other income									24	254
Total revenues									5,949	5,879
Expenses
Interest									16	18
Administrative and other									536	419
Total expenses									552	437
Income before applicable income tax benefit and equity in undistributed net income of subsidiary									5,397	5,442
Applicable income tax benefit									(113)	(89)
Income before equity in undistributed net income of subsidiary									5,510	5,531
Equity in undistributed net income - Union									5,138	1,541
Net income									$ 10,648	$ 7,072