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Loans - Schedule of Accretable Yield, or Income Expected to be Collected (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, after Allowance for Credit Loss [Abstract]
Balance at beginning of period	$ 260	$ 294
Accretion of income	(33)	(34)
Balance at end of period	$ 227	$ 260

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- Definition

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

Name:	kffb_CertainLoanAcquiredInTransferAccretableYield
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	kffb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritieAccretableYieldAccretion
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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