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Cover Page - USD ($)
 12 Months Ended
Jun. 30, 2024
Sep. 05, 2024
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Trading Symbol IROQ  
Entity Registrant Name IF BANCORP, INC.  
Entity Central Index Key 0001514743  
Current Fiscal Year End Date --06-30  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   3,353,026
Entity Public Float $ 38,977,000  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Security Exchange Name NASDAQ  
Entity Address, State or Province IL  
Entity Address, Address Line One 201 East Cherry Street  
Entity Address, City or Town Watseka  
City Area Code 815  
Local Phone Number 432-2476  
Entity Tax Identification Number 45-1834449  
Entity Incorporation, State or Country Code MD  
Entity File Number 001-35226  
Entity Address, Postal Zip Code 60970  
Auditor Name FORVIS MAZARS, LLP  
Auditor Firm ID 686  
Auditor Location Decatur, Illinois  
Document Financial Statement Error Correction [Flag] false  
ICFR Auditor Attestation Flag false