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Commitments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Commitments [Line Items] |  |
Commitments to originate loans | $ 280,900 | $ 251,200
Credit Risk Contract |  |
Commitments [Line Items] |  |
Pipeline of loans held-for-sale | 16,000 | 11,700
Standby Letters of Credit |  |
Commitments [Line Items] |  |
Other commitment | $ 160 | $ 115

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- Definition Commitments. + References No definition available. + Details
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Namespace Prefix: | krny_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments to originate loans. + References No definition available. + Details
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Namespace Prefix: | krny_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |