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Loans Receivable (Details) - Schedule of purchased credit impaired loans - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Jun. 30, 2021
Schedule of purchased credit impaired loans [Abstract]
One- to four-family residential real estate	$ 434	$ 595

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- References

No definition available.

+ Details

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

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- Definition

The cash outflow from the acquisition of residential property intended to generate income for the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration