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Loans receivable (Details 6) - Residential Real Estate [Member] - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Extension of loan term | $ 98 |
Financing Receivable, Rate Reduction |  | $ 3
Performing Financing Receivable [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Extension of loan term | 98 |
Financing Receivable, Rate Reduction |  | 3
Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Extension of loan term | $ 0 |
Financing Receivable, Rate Reduction |  | $ 0

X
- Definition Represents financing receivable loan extension during the period. + References No definition available. + Details
Name: | kffb_FinancingReceivableExtensionOfLoanTerm
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents financing receivable rate reduction during the period. + References No definition available. + Details
Name: | kffb_FinancingReceivableRateReduction
Namespace Prefix: | kffb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | kffb_ResidentialRealEstateFamilyAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |