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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 29, 2020
Jun. 30, 2019
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity File Number 0-14237    
Entity Registrant Name FIRST UNITED CORP/MD/    
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 Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 129,336,923
Entity Common Stock, Shares Outstanding   7,112,189  
Documents Incorporated by Reference

None

   
Entity Central Index Key 0000763907    
Amendment Flag false