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Loans Receivable (Details Textual) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019
Loans Receivable (Textual) |  |  |
Net of a purchase credit discount | $ 351 |  | $ 351
Loans receivable, description | One- to four-family loans in process of foreclosure totaled $654,000 and $1.2 million at March 31, 2020 and June 30, 2019, respectively |  |
Troubled Debt Restructuring [Member] |  |  |
Loans Receivable (Textual) |  |  |
Loans classified as TDRs | $ 1,800 |  | $ 1,600
Bankruptcy proceedings, percentage | 22.50% |  |
Secondary mortgage loan |  | $ 219 |
Additional loan |  | 30 |
TDRs |  |  |

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- Definition Represent additional loan. + References No definition available. + Details
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Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of Financial instruments for TDRs + References No definition available. + Details
Name: | kffb_FinancingReceivableModificationsPostModificationRecordedInvestment
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loans receivable, description. + References No definition available. + Details
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Namespace Prefix: | kffb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | kffb_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Represents the percentage of bankruptcy proceedings to borrower. + References No definition available. + Details
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Namespace Prefix: | kffb_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Represent secondary mortgage loan. + References No definition available. + Details
Name: | kffb_SecondaryMortgageLoan
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5275-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |