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v3.25.2

Loan Commitments (Details) - USD ($) | Jun. 30, 2025 | Jun. 30, 2024
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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