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Loans Receivable (Details 5) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Modifications [Line Items]
Residential real estate: Terms extended	$ 249	$ 314
Troubled Debt Restructurings Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Residential real estate: Terms extended	249	314
Troubled Debt Restructurings Not Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Residential real estate: Terms extended

X

- Definition

Represents financing receivable terms extended during the period.

+ References

No definition available.

+ Details

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

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: