Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 10, 2022
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	000-51821
Entity Registrant Name	LAKE SHORE BANCORP, INC.
Entity Incorporation, State or Country Code	X1
Entity Tax Identification Number	20-4729288
Entity Address, Address Line One	31 East Fourth Street
Entity Address, City or Town	Dunkirk
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14048
City Area Code	716
Local Phone Number	366-4070
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	LSBK
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		5,707,387
Entity Central Index Key	0001341318