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Investment Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Pledged securities	$ 1.8	$ 1.8

X

- Definition

The amount of pledged securities.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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