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Loans Receivable (Details) - Schedule of Purchased Loans $ in Thousands | Jun. 30, 2023 USD ($)
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Schedule of Purchased Loans [Abstract] |
One- to four-family residential real estate | $ 196

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

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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