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Loans receivable (Details Textual) - USD ($) | 6 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016
Financing Receivable, Modifications [Line Items] |  |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment | $ 388,000 | $ 464,000
Percentage Of Bankruptcy Proceedings To Borrower | 25.00% |
Financing Receivable, Modifications, Recorded Investment | $ 1,900,000 | $ 1,800,000

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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
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=66008989&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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant