XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.23.3

Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2023 | Jun. 30, 2023
Fair Value [Member] |  |
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis [Line Items] |  |
Agency mortgage-backed: residential | $ 11,230 | $ 12,080
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis [Line Items] |  |
Agency mortgage-backed: residential |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis [Line Items] |  |
Agency mortgage-backed: residential | 11,230 | 12,080
Significant Unobservable Inputs (Level 3) [Member] |  |
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis [Line Items] |  |
Agency mortgage-backed: residential |  |

X
- Definition Agency mortgage-backed: residential. + References No definition available. + Details
Name: | kffb_AgencyMortgagebackedResidential
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | kffb_DisclosuresAboutFairValueofAssetsandLiabilitiesDetailsScheduleofFinancialAssetsMeasuredatFairValueonaRecurringBasisLineItems
Namespace Prefix: | kffb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |