v3.26.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Securities Act File Number 000-56690  
Entity Registrant Name EWSB BANCORP, INC  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 33-2899738  
Entity Address, State or Province WI  
Entity Address, Address Line One 109 West Second Street  
Entity Address, City or Town Kaukauna  
Entity Address, Postal Zip Code 54130  
City Area Code 920  
Local Phone Number 766-4646  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock  
Trading Symbol EWSB  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   1,014,220
Entity Central Index Key 0002013792  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Amendment Flag false