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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Sep. 24, 2019
Dec. 31, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name Kentucky First Federal Bancorp    
Entity Central Index Key 0001297341    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Document Type 10-K    
Document Period End Date Jun. 30, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Ex Transition Period false    
Entity Interactive Data Current Yes    
Entity File Number 0-51176    
Entity Incorporation State Country Code KY    
Entity Public Float     $ 28,600
Entity Common Stock, Shares Outstanding   8,370,715