| Cover | Dec. 18, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 18, 2024 |
| Entity Registrant Name | UNION BANKSHARES, INC. |
| Entity Central Index Key | 0000706863 |
| Entity Incorporation, State or Country Code | VT |
| Entity File Number | 001-15985 |
| Entity Tax Identification Number | 03-0283552 |
| Entity Address, Address Line One | 20 Lower Main St., P.O. Box 667 |
| Entity Address, City or Town | Morrisville |
| Entity Address, State or Province | VT |
| Entity Address, Postal Zip Code | 05661-0667 |
| City Area Code | 802 |
| Local Phone Number | 888-6600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
