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Loans Receivable (Details) - Schedule of purchased loans - USD ($) $ in Thousands | Mar. 31, 2023 | Jun. 30, 2022
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Schedule Of Purchased Loans Abstract |  |
One- to four-family residential real estate | $ 366 | $ 400

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- Definition A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land). + References No definition available. + Details
Name: | kffb_OneToFourfamilyResidentialRealEstate
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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