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Loans - Schedule of Accretable Yield, or Income Expected to be Collected (Details) - USD ($) $ in Thousands | 12 Months Ended
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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