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Loans Receivable (Details 5) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Residential real estate:
Terms extended and additional funds advanced	$ 120
Terms extended		$ 249
Troubled Debt Restructurings Performing to Modified Terms [Member]
Residential real estate:
Terms extended and additional funds advanced	120
Terms extended		249
Troubled Debt Restructurings Not Performing to Modified Terms [Member]
Residential real estate:
Terms extended and additional funds advanced
Terms extended

X

- Definition

Represents financing receivable terms extended and additional funds advanced.

+ References

No definition available.

+ Details

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

X

- Definition

Terms extended.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_RealEstateAbstract
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: