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Formal Written Agreement (Details)	Aug. 13, 2024
Formal Written Agreement [Line Items]
Total capital ratio of least	12.00%
Leverage ratio of least	9.00%
Minimum [Member]
Formal Written Agreement [Line Items]
Capital ratio least	9.00%
Maximum [Member]
Formal Written Agreement [Line Items]
Capital ratio least	11.00%

X

- Definition

The percentage of banking regulation supplementary leverages ratio capital adequacy minimum.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of banking regulation tier one leverages capital ratio undercapitalized minimum.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

The percentage of tier one leverage capital required for capital adequacy to average asset.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: