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Loans (Details) - Schedule of Purchased Loans - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
One-to four-family [Member] | Residential Real Estate [Member]
Schedule of Purchased Loans [Line Items]
One- to four-family	$ 175	$ 196

X

- 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

X

- References

No definition available.

+ Details

Name:	kffb_LoansDetailsScheduleofPurchasedLoansLineItems
Namespace Prefix:	kffb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=kffb_ResidentialRealEstateOneToFourFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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