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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
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 P.O. BOX 667    
Entity Address, Address Line Two 20 LOWER MAIN STREET    
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    
Title of 12(b) Security Common Stock, $2.00 par value    
Trading Symbol UNB    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 86,135,210
Entity Common Stock, Shares Outstanding   4,538,596  
Documents Incorporated by Reference
Specifically designated portions of the following document are incorporated by reference in the indicated Part of this Annual Report on Form 10-K:
    
Entity Central Index Key 0000706863    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false