XML 12 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Cover Page - USD ($)
 12 Months Ended
Jun. 30, 2021
Sep. 03, 2021
Dec. 31, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jun. 30, 2021    
Document Fiscal Year Focus 2021    
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   3,240,376  
Entity Public Float     $ 50,800,894
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