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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Feb. 29, 2024
Jun. 30, 2023
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
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     $ 85,737,171
Entity Common Stock, Shares Outstanding   6,643,161  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Entity Central Index Key 0000763907    
Amendment Flag false    
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for the 2024 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    
Auditor Firm ID 173    
Auditor Location Washington, D.C.    
Document Financial Statement Error Correction [Flag] false