XML 104 R55.htm IDEA: XBRL DOCUMENT
v3.19.3

Securities Held to Maturity - Schedule Of Held To Maturity Securities Pledged (Detail) - Securities Held to Maturity [Member] - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Held to maturity securities pledged | $ 37,888 | $ 260,022
FHLB of New York [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held to maturity securities pledged |  | 136,696
Secure Public Funds On Deposit [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held to maturity securities pledged |  | 7,023
Federal Reserve ("FRB") [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held to maturity securities pledged | $ 37,888 | 103,419
Depositor Sweep Accounts [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held to maturity securities pledged |  | $ 12,884

X
- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
Name: | us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
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_ScheduleOfHeldToMaturitySecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_HeldtomaturitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=krny_SecurePublicFundsOnDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=krny_FederalReserveBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=krny_DepositorSweepAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |