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Earnings Per Share (Details Textual) - shares	9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share (Textual)
Stock option shares outstanding

X

- Definition

Earnings Per Share (Textual).

+ References

No definition available.

+ Details

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

X

- Definition

Stock option shares outstanding.

+ References

No definition available.

+ Details

Name:	kffb_StockOptionSharesOutstanding
Namespace Prefix:	kffb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration