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Loans Receivable (Details 5) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Modifications [Line Items]
Terms extended and additional funds advanced	$ 32	$ 324	$ 325
Chapter 7 bankruptcy without reaffirmation			32
Troubled Debt Restructurings Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Terms extended and additional funds advanced	32	324	325
Chapter 7 bankruptcy without reaffirmation			32
Troubled Debt Restructurings Not Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Terms extended and additional funds advanced
Chapter 7 bankruptcy without reaffirmation

X

- Definition

Represents financing receivable terms extended and additional funds advanced.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of bankruptcy claim filed with bankruptcy court.

+ References

No definition available.

+ Details

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

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
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: