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Cover Page - shares
 6 Months Ended
Dec. 31, 2020
Feb. 04, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Dec. 31, 2020  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Trading Symbol IROQ  
Entity Registrant Name IF Bancorp, Inc.  
Entity Central Index Key 0001514743  
Current Fiscal Year End Date --06-30  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   3,240,376
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  
Security Exchange Name NASDAQ  
Entity Address, State or Province IL