Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2020
Entity File Number	001-15985
Entity Registrant Name	UNION BANKSHARES, INC.
Entity Incorporation, State or Country Code	VT
Entity Tax Identification Number	03-0283552
Entity Address, Address Line One	20 LOWER MAIN STREET, P.O. BOX 667
Entity Address, City or Town	MORRISVILLE
Entity Address, State or Province	VT
Entity Address, Postal Zip Code	05661
City Area Code	802
Local Phone Number	888-6600
Title of 12(b) Security	Common Stock, $2.00 par value
Trading Symbol	UNB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		4,475,314
Entity Central Index Key	0000706863
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false