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Document and Entity Information
May 25, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 25, 2022
Entity Registrant Name IF BANCORP, INC.
Entity Incorporation, State or Country Code MD
Entity File Number 001-35226
Entity Tax Identification Number 45-1834449
Entity Address, Address Line One 201 East Cherry Street
Entity Address, City or Town Watseka
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60970
City Area Code 815
Local Phone Number 432-2476
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001514743
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol IROQ
Security Exchange Name NASDAQ