XML 92 R81.htm IDEA: XBRL DOCUMENT
v3.19.1

Fair Value of Financial Instruments - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | $ 741,888 | $ 756,966
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 4,240 | 4,469
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 3,392 | 3,562
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Non-Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 791 | 794
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Commercial Business [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 57 | 113
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 4,240 | 4,469
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | $ 3,392 | $ 3,562
Valuation Techniques | [1] | Market valuation of underlying collateral |
Unobservable Input | [2] | Adjustments to reflect current conditions/selling costs |
Weighted Average |  | 9.35% | 12.34%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Non-Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | $ 791 | $ 794
Valuation Techniques | [1] | Market valuation of underlying collateral |
Unobservable Input | [2] | Adjustments to reflect current conditions/selling costs |
Weighted Average |  | 12.29% | 14.07%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Commercial Business [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | $ 57 | $ 113
Valuation Techniques | [1] | Market valuation of underlying collateral |
Unobservable Input | [2] | Adjustments to reflect current conditions/selling costs |
Weighted Average |  | 7.48% | 14.54%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Minimum [Member] | Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Range |  | 6.00% | 6.00%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Minimum [Member] | Non-Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Range |  | 12.00% | 14.00%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Minimum [Member] | Commercial Business [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Range |  | 0.00% | 10.00%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Maximum [Member] | Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Range |  | 21.00% | 26.00%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Maximum [Member] | Non-Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Range |  | 13.00% | 15.00%
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Maximum [Member] | Commercial Business [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Range |  | 10.00% | 24.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | $ 209 |
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 209 |
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Market Valuation of Underlying Collateral [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | 209 |
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Market Valuation of Underlying Collateral [Member] | Residential Mortgage [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Assets, Fair Value |  | $ 209 |
Valuation Techniques | [3] | Market valuation of underlying collateral |
Unobservable Input | [2] | Adjustments to reflect current conditions/selling costs |
Range |  | 5.00% |
Weighted Average |  | 5.00% |
[1] | The fair value of impaired loans is generally determined based on an independent appraisal of the fair value of a loan’s underlying collateral.
[2] | The fair value basis of impaired loans and other real estate owned is adjusted to reflect management estimates of selling costs including, but not necessarily limited to, real estate brokerage commissions and title transfer fees
[3] | The fair value basis of other real estate owned is generally determined based upon the lower of an independent appraisal of the property’s fair value or the applicable listing price or contracted sales price.

X
- Definition Percentage of collateral or property market value. + References No definition available. + Details
Name: | krny_PercentageOfCollateralOrPropertyMarketValue
Namespace Prefix: | krny_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average percentage of collateral or property market value. + References No definition available. + Details
Name: | krny_WeightedAveragePercentageOfCollateralOrPropertyMarketValue
Namespace Prefix: | krny_
Data Type: | num:percentItemType
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=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 the sensitivity of the fair value measurements to changes in unobservable inputs and the inter-relationships between those inputs as well as how those inter-relationships might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsSensitivityAnalysisDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the valuation processes in place for fair value measurements categorized within Level 3 of the fair value hierarchy. + 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 (f) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsValuationProcessesDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=krny_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=krny_NonResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=krny_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |