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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Oct. 31, 2021
Document and Entity Information [Abstract]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Sep. 30, 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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   6,617,941
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Entity Central Index Key 0000763907  
Amendment Flag true  
Amendment Description This Amendment No. 1 on Form 10-Q/A is being filed for the purpose of amending the number of outstanding shares of the common stock of First United Corporation (the “Corporation”) stated on the cover page to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, which was filed with the Securities and Exchange Commission (the “SEC”) on November 9, 2021 (the “Original Report”).  Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by the Corporation’s principal executive officer and principal financial officer are filed or furnished with this Amendment No. 1 as Exhibits 31.1, 31.2, and 32.1, so Item 6 of Part II of the Original Report is also amended hereby.