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Federal Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 1997
Federal Income Taxes (Textual)
Effective income tax rate reconciliation special bad debt deduction		8.00%
Retained earnings for which federal income taxes have not been provided	$ 5.2
Amount of unrecognized deferred tax liability relating to the cumulative bad debt deduction	$ 1.1

X

- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction for bad debt.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Value represents retained earnings not recognized for federal income taxes.

+ References

No definition available.

+ Details

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Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to bad debt reserve for tax purposes of a qualified lender.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 740
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479915&loc=d3e66715-112838

+ Details

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