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Loans Receivable (Details) - Schedule of purchased credit impaired loans - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022
Schedule of Purchased Credit Impaired Loans [Abstract]
One- to four-family residential real estate	$ 391	$ 400

X

- References

No definition available.

+ Details

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

X

- 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

+ Details

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