XML 54 R37.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Foreclosed and Repossessed Assets [Member] | 1-4 family [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 5 | $ 103
Valuation Technique(s) | Sales comparison approach | Sales comparison approach
Unobservable Input(s) | Adjustments for differences between comparable sales | Adjustments for differences between comparable sales
Range (Weighted Average) | 0.00% | (9.50%)
Foreclosed and Repossessed Assets [Member] | 1-4 family [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Range (Weighted Average) | 0.00% | 45.80%
Foreclosed and Repossessed Assets [Member] | 1-4 family [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Range (Weighted Average) | 0.00% | (3.60%)
Foreclosed and Repossessed Assets [Member] | Land [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value |  | $ 79
Valuation Technique(s) |  | Sales comparison approach
Unobservable Input(s) |  | Adjustments for differences between comparable sales
Range (Weighted Average) |  | (5.00%)
Foreclosed and Repossessed Assets [Member] | Land [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Range (Weighted Average) |  | 6.60%
Foreclosed and Repossessed Assets [Member] | Land [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Range (Weighted Average) |  | 3.50%
Loans [Member] | 1-4 family [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 513 |
Valuation Technique(s) | Sales comparison approach |
Unobservable Input(s) | Adjustments for differences between comparable sales |
Range (Weighted Average) | (27.80%) |
Loans [Member] | 1-4 family [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Range (Weighted Average) | (38.50%) |
Loans [Member] | 1-4 family [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Range (Weighted Average) | 20.70% |

X
- Definition Weighted average expected volatility of stock price. + References No definition available. + Details
Name: | kffb_FairValueAssumptionWeightedAverageVolatilityRate
Namespace Prefix: | kffb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References No definition available. + Details
Name: | kffb_FairValueMeasurementValuationTechniques
Namespace Prefix: | kffb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of where the gains (losses) for the period arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) are included in other comprehensive income. + 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 (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInOtherComprehensiveIncomeLossDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=kffb_RepossessedAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kffb_ResidentialRealEstateFamilyAxis=kffb_ResidentialRealEstateOneToFourFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kffb_ResidentialRealEstateFamilyAxis=kffb_ResidentialRealEstateLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=us-gaap_LoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |