XML 72 R57.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Deposits (Details) - USD ($) | Jun. 30, 2022 | Jun. 30, 2021
--- | --- | ---
Deposits (Details) [Line Items] |  |
Certificate of deposits | $ 250,000 |
Deposit totaling |  | $ 13,100,000
Deposit Account [Member] |  |
Deposits (Details) [Line Items] |  |
Deposit totaling |  | $ 11,200,000

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

X
- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DepositAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DepositsAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_DepositAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |