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Loans Receivable (Details) - Schedule of types troubled debt restructuring loan modifications - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Residential real estate: |  |
Terms extended |  | $ 677
Terms extended and additional funds advanced |  | 119
Chapter 7 bankruptcy | $ 143 | 21
Troubled Debt Restructurings Performing to Modified Terms [Member] |  |
Residential real estate: |  |
Terms extended |  | 677
Terms extended and additional funds advanced |  | 119
Chapter 7 bankruptcy | 143 | 21
Troubled Debt Restructurings Not Performing to Modified Terms [Member] |  |
Residential real estate: |  |
Terms extended |  |
Terms extended and additional funds advanced |  |
Chapter 7 bankruptcy |  |

X
- Definition Represents financing receivable chapter 7 bankruptcy. + References No definition available. + Details
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Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents financing receivable terms extended. + References No definition available. + Details
Name: | kffb_FinancingReceivableTermsExtended
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
- References No definition available. + Details
Name: | kffb_ResidentialRealEstateAbstract00000000000
Namespace Prefix: | kffb_
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: |