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Loan Commitments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
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Unused commitment, Revolving, open-end lines secured by real estate [Member] | Fixed [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments |  |
Unused commitment, Revolving, open-end lines secured by real estate [Member] | Variable [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments | 9,512 | 9,443
Commitments to fund real estate construction loans [Member] | Fixed [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments | 1,104 | 692
Commitments to fund real estate construction loans [Member] | Variable [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments | 2,294 | 2,365
Other unused commitment, Commercial and industrial loans [Member] | Fixed [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments |  | 1,121
Other unused commitment, Commercial and industrial loans [Member] | Variable [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments | 1,331 |
Other unused commitment, Other [Member] | Fixed [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments | 801 | 907
Other unused commitment, Other [Member] | Variable [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments | 1,448 | 1,266
Letters of credit [Member] | Fixed [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments |  |
Letters of credit [Member] | Variable [Member] |  |
Loss Contingencies [Line Items] |  |
Outstanding loan commitments |  |

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- 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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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

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

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

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

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

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- Details
Name: | kffb_UnusedCommitmentsAxis=kffb_OtherUnusedCommitmentsLettersOfCreditMember
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Balance Type: |
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