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Loans Receivable (Details) - Schedule of Purchased Loans - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024
One- to four-family residential real estate [Member]
Schedule of Purchased Loans [Abstract]
Carrying amount of loans	$ 142	$ 175

X

- Definition

Carrying amount of loans.

+ References

No definition available.

+ Details

Name:	kffb_LoansAndLeasesReceivablesImpairedInterestLostOnNonaccrualLoans
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=kffb_OneToFourfamilyResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: