XML 46 R36.htm IDEA: XBRL DOCUMENT v3.22.0.1

Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of financial assets measured at fair value on a recurring basis - Agency mortgage-backed: residential [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 30, 2021
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of financial assets measured at fair value on a recurring basis [Line Items]
Fair value	$ 30	$ 33
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of financial assets measured at fair value on a recurring basis [Line Items]
Fair value
Significant Other Observable Inputs (Level 2) [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of financial assets measured at fair value on a recurring basis [Line Items]
Fair value	30	33
Significant Unobservable Inputs (Level 3) [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of financial assets measured at fair value on a recurring basis [Line Items]
Fair value

X

- References

No definition available.

+ Details

Name:	kffb_DisclosuresAboutFairValueofAssetsandLiabilitiesDetailsScheduleoffinancialassetsmeasuredatfairvalueonarecurringbasisLineItems
Namespace Prefix:	kffb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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=us-gaap_ResidentialMortgageBackedSecuritiesMember
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: