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Cover - USD ($)
 12 Months Ended
Jun. 30, 2025
Sep. 04, 2025
Dec. 31, 2024
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jun. 30, 2025    
Document Fiscal Year Focus 2025    
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   3,351,526  
Entity Public Float     $ 56,138,000
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    
Document Financial Statement Error Correction [Flag] false    
ICFR Auditor Attestation Flag false    
Amendment Description This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K for the fiscal year ended June 30, 2025, originally filed on September 11, 2025 (the “Original Filing”), by IF Bancorp, Inc., a Maryland corporation (“IF Bancorp” or the “Company”). The Company is filing this Amendment to present the information required by Part III of Form 10-K as the Company will not file a definitive annual proxy statement within 120 days of the end of its fiscal year ended June 30, 2025. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment also contains new certifications by the principal executive officer and the principal financial officer as required by Section 302 of the Sarbanes-Oxley Act of 2002. Accordingly, Item 15(a)(3) of Part IV is amended to include the currently dated certifications as exhibits. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. Except as described above or as expressly noted in this Amendment, no other changes have been made to the Original Filing. The Original Filing continues to speak as of and for the periods covered in the Original Filing, and the Company has not updated the disclosures contained therein to reflect any subsequent events.