XML 73 R56.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans (Details) - Schedule of Purchased Loans - USD ($) $ in Thousands | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
One-to four-family [Member] | Residential Real Estate [Member] |  |
Schedule of Purchased Loans [Line Items] |  |
One- to four-family | $ 175 | $ 196

X
- Definition Carrying amount of loans. + References No definition available. + Details
Name: | kffb_LoansAndLeasesReceivablesImpairedInterestLostOnNonaccrualLoans
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=kffb_ResidentialRealEstateOneToFourFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |