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Document And Entity Information - shares
 6 Months Ended
Dec. 31, 2016
Feb. 09, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2016  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Entity Registrant Name Kentucky First Federal Bancorp  
Entity Central Index Key 0001297341  
Current Fiscal Year End Date --06-30  
Entity Filer Category Smaller Reporting Company  
Trading Symbol KFFB  
Entity Common Stock, Shares Outstanding   8,483,501