XML 33 R23.htm IDEA: XBRL DOCUMENT
v3.22.1

Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Jun. 30, 2021
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
Pledged securities | $ 1.5 | $ 1.8

X
- Definition The amount of pledged securities. + References No definition available. + Details
Name: | kffb_PledgedSecurities
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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