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Loan Commitments (Details) - USD ($)	Jun. 30, 2025	Jun. 30, 2024
Loan Commitments [Abstract]
unfunded commitments	$ 59,000	$ 60,000

X

- Definition

The amount of unfunded commitments.

+ References

No definition available.

+ Details

Name:	kffb_UnfundedCommitments
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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