Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 28, 2021	Jun. 30, 2020
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
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			$ 85,527,660
Entity Common Stock, Shares Outstanding		6,995,867
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Central Index Key	0000763907
Amendment Flag	false
Documents Incorporated by Reference	Portions of the registrant's definitive proxy statement for the 2021 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.