Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Mar. 01, 2024	Jun. 30, 2023
Document And Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Fiscal Period Focus	FY
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-35021
Entity Registrant Name	EVANS BANCORP, INC.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	16-1332767
Entity Address, Address Line One	6460 Main Street
Entity Address, City or Town	Williamsville
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14221
City Area Code	716
Local Phone Number	926-2000
Title of 12(b) Security	Common Stock, $0.50 par value
Trading Symbol	EVBN
Security Exchange Name	NYSEAMER
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
Document Financial Statement Error Correction	false
Entity Common Stock, Shares Outstanding		5,508,593
Entity Public Float			$ 132
Documents Incorporated by Reference [Text Block]	Portions of the registrant's Proxy Statement relating to the registrant's 2024 Annual Meeting of Shareholders, to be held on May 7, 2024, which will be subsequently filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Report relates, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.
Amendment Flag	false
Entity Central Index Key	0000842518
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Auditor Name	Crowe LLP
Auditor Firm ID	173
Auditor Location	Grand Rapids, Michigan