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Loan Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Unused commitment, Revolving, open-end lines secured by real estate [Member] | Fixed [Member]
Outstanding loan commitments
Unused commitment, Revolving, open-end lines secured by real estate [Member] | Variable [Member]
Outstanding loan commitments	9,443	8,847
Unused commitment, Commitments to fund real estate construction loans [Member] | Fixed [Member]
Outstanding loan commitments	692	1,609
Unused commitment, Commitments to fund real estate construction loans [Member] | Variable [Member]
Outstanding loan commitments	2,365	3,311
Other unused commitment, Commercial and industrial loans [Member] | Fixed [Member]
Outstanding loan commitments	1,121	1,082
Other unused commitment, Commercial and industrial loans [Member] | Variable [Member]
Outstanding loan commitments
Other unused commitment, Other [Member] | Fixed [Member]
Outstanding loan commitments	907	1,102
Other unused commitment, Other [Member] | Variable [Member]
Outstanding loan commitments	1,266	1,908
Other unused commitment, Letters of credit [Member] | Fixed [Member]
Outstanding loan commitments
Other unused commitment, Letters of credit [Member] | Variable [Member]
Outstanding loan commitments

X

- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

Name:	us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	kffb_UnusedCommitmentsAxis=kffb_UnusedCommitmentsRevolvingOpenendLinesSecuredByRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	kffb_CommitmentAxis=kffb_FixedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	kffb_CommitmentAxis=kffb_VariableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	kffb_UnusedCommitmentsAxis=kffb_UnusedCommitmentsCommitmentsToFundRealEstateConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	kffb_UnusedCommitmentsAxis=kffb_OtherUnusedCommitmentsCommercialAndIndustrialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	kffb_UnusedCommitmentsAxis=kffb_OtherUnusedCommitmentsOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	kffb_UnusedCommitmentsAxis=kffb_OtherUnusedCommitmentsLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: