v3.25.2
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Document Information [Line Items]    
Entity Central Index Key 0001478454  
Entity Registrant Name Eagle Bancorp Montana, Inc.  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2025  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 1-34682  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-1449820  
Entity Address, Address Line One 1400 Prospect Avenue  
Entity Address, City or Town Helena  
Entity Address, State or Province MT  
Entity Address, Postal Zip Code 59601  
City Area Code 406  
Local Phone Number 442-3080  
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   7,952,177