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Deposits (Details Textual) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Deposits (Textual) |  |
Certificate of deposit accounts with balances equal to or in exceeding of $250,000 totaling | $ 7.9 | $ 4.7

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- References No definition available. + Details
Name: | kffb_DepositsTextualAbstract
Namespace Prefix: | kffb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References No definition available. + Details
Name: | kffb_TimeDeposits250000OrMore
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant