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Investment Securities (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025
Investment Securities [Line Items]
Pedged securities	$ 0	$ 0
Pledged overnight deposits totaled	$ 271,415,000	$ 277,563,000
Debt securities unrealized loss position percent	70.70%	88.80%
Pledged Overnight [Member]
Investment Securities [Line Items]
Pledged overnight deposits totaled	$ 0	$ 0

X

- Definition

Percentage of debt securities unrealized loss position.

+ References

No definition available.

+ Details

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

X

- Definition

Represent the amount of pledged securities.

+ References

No definition available.

+ Details

Name:	kffb_PledgedSecurities
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Details

Name:	us-gaap_PledgedStatusAxis=kffb_PledgedOvernightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: