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Loans Receivable - Schedule of Purchased Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025
One- to four-family residential real estate [Member]
Schedule of Purchased Loans [Line Items]
Carrying amount of loans	$ 133	$ 134

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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