XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans Receivable (Details) - Schedule of Purchased Loans - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | ---
One- to four-family residential real estate [Member] |  |
Schedule of Purchased Loans [Abstract] |  |
Carrying amount of loans | $ 142 | $ 175

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_LoansReceivableDetailsScheduleofPurchasedLoansLineItems
Namespace Prefix: | kffb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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