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Investment Securities (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Jun. 30, 2018
Investment Securities (Textual)
Pledged securities	$ 2,000	$ 2,100
Amortized cost	544
Available-for-sale Securities, Estimated fair value	$ 547	$ 48
Maturity date	Mar. 31, 2020
Agency bond [Member]
Investment Securities (Textual)
Amortized cost	$ 501
Available-for-sale Securities, Estimated fair value	$ 503

X

- Definition

Maturity date for investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	kffb_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	kffb_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

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X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

+ Details

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X

- Details

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