Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
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 St.
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	NYSE
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 Common Stock, Shares Outstanding		5,384,139
Amendment Flag	false
Entity Central Index Key	0000842518
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020