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Other Comprehensive Income (Loss) (Details) - Schedule of Accumulated Other Comprehensive Income Balances, Net of Tax $ in Thousands	3 Months Ended
	Sep. 30, 2023 USD ($)
Schedule of Accumulated Other Comprehensive Income Balances Net of Tax [Abstract]
Balance at beginning of period	$ (427)
Current year change	(138)
Ending balance	$ (565)

X

- Definition

Current year change.

+ References

No definition available.

+ Details

Name:	kffb_CurrentYearChange
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	kffb_ScheduleOfAccumulatedOtherComprehensiveIncomeBalancesNetOfTaxAbstract
Namespace Prefix:	kffb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B

+ Details

Name:	us-gaap_UnrecognizedTaxBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant