XML 54 R37.htm IDEA: XBRL DOCUMENT
v3.21.2

Summary of Significant Accounting Policies (Details) - Schedule of fair value measurements of assets and liabilities measured at fair value on a recurring basis - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Agency mortgage-backed: residential [Member] |  |
Fair Value | $ 33 | $ 38
Agency Bonds [Member] |  |
Fair Value |  | 503
Quotes Prices in Active Markets for Identical Assets (Level 1) [Member] | Agency mortgage-backed: residential [Member] |  |
Fair Value |  |
Quotes Prices in Active Markets for Identical Assets (Level 1) [Member] | Agency Bonds [Member] |  |
Fair Value |  |
Significant Other Observable Inputs (Level 2) [Member] | Agency mortgage-backed: residential [Member] |  |
Fair Value | 33 | 38
Significant Other Observable Inputs (Level 2) [Member] | Agency Bonds [Member] |  |
Fair Value |  | 503
Significant Unobservable Inputs (Level 3) [Member] | Agency mortgage-backed: residential [Member] |  |
Fair Value |  |
Significant Unobservable Inputs (Level 3) [Member] | Agency Bonds [Member] |  |
Fair Value |  |

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=kffb_AgencyMortgagebackedResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=kffb_AgencyBondsMember
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: |