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v3.20.1

Loans Receivable (Details 5) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Residential real estate: |  |
Terms extended | $ 677 | $ 324
Terms extended and additional funds advanced | 119 |
Chapter 7 bankruptcy | 21 |
Troubled Debt Restructurings Performing to Modified Terms [Member] |  |
Residential real estate: |  |
Terms extended | 677 | 324
Terms extended and additional funds advanced | 119 |
Chapter 7 bankruptcy | 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 Chapter 7 bankruptcy. + References No definition available. + Details
Name: | kffb_ChapterBankruptcy
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
- 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: |