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Loans Receivable (Details) - Schedule of Purchased Loans - USD ($) $ in Thousands | Dec. 31, 2023 | Jun. 30, 2023
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Residential Real Estate [Member] | One- To Four-Family [Member] |  |
Schedule of Purchased Loans [Abstract] |  |
Carrying amount of loans | $ 185 | $ 196

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- Definition Carrying amount of loans. + References No definition available. + Details
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Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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- Details
Name: | us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=kffb_OneToFourFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |