v3.25.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Aug. 08, 2025
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-42754  
Entity Registrant Name LAKE SHORE BANCORP, INC.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 39-3058424  
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   7,825,501
Entity Central Index Key 0002059653