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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Feb. 28, 2022
Jun. 30, 2021
Document and Entity Information [Abstract]        
Document Type 10-K      
Document Annual Report true      
Document Period End Date Dec. 31, 2021      
Document Transition Report false      
Current Fiscal Year End Date --12-31      
Entity File Number 0-14237      
Entity Registrant Name First United Corporation      
Entity Incorporation, State or Country Code MD      
Entity Tax Identification Number 52-1380770      
Entity Address, Address Line One 19 South Second Street      
Entity Address, City or Town Oakland      
Entity Address, State or Province MD      
Entity Address, Postal Zip Code 21550-0009      
City Area Code 800      
Local Phone Number 470-4356      
Title of 12(b) Security Common Stock      
Trading Symbol FUNC      
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      
ICFR Auditor Attestation Flag false      
Entity Shell Company false      
Entity Public Float       $ 103,340,012
Entity Common Stock, Shares Outstanding     6,623,758  
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2021      
Entity Central Index Key 0000763907      
Amendment Flag false      
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for the 2022 Annual Meeting of Shareholders to be filed with the SEC pursuant to Regulation 14A are incorporated by reference into Part III of this Annual Report on Form 10-K.

      
Auditor Name Crowe LLP Baker Tilly US, LLP    
Auditor Firm ID 173 23    
Auditor Location Washington, D.C. Pittsburgh, Pennsylvania