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Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Jun. 30, 2023
Investment Securities [Abstract]
Pledged securities	$ 0.0	$ 5.9
Overnight deposits	$ 0.0	$ 1.5
Debt securities unrealized loss position percent	100.00%	100.00%

X

- Definition

Percentage of debt securities unrealized loss position.

+ References

No definition available.

+ Details

Name:	kffb_DebtSecuritiesUnrealizedLossPositionPercentage
Namespace Prefix:	kffb_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of overnight deposits.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

Name:	us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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