XML 68 R57.htm IDEA: XBRL DOCUMENT
v3.19.1

Impairment of Securities - Schedule of Temporary Impairment Losses, Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 Months | $ 22,730 | $ 476,641
Less than 12 Months: Fair Value | 186 | 7,824
Less than 12 Months: Unrecognized Losses | 195,910 | 78,832
12 Months or More: Fair Value | $ 2,293 | $ 2,548
Number of securities | 185 | 371
Total: Fair Value | $ 218,640 | $ 555,473
Total: Unrecognized Losses | 2,479 | 10,372
Debt Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Total: Unrecognized Losses | 371 | 2,149
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 Months | 2,235 | 86,678
Less than 12 Months: Fair Value | 3 | 1,662
Less than 12 Months: Unrecognized Losses | 35,556 | 3,151
12 Months or More: Fair Value | $ 177 | $ 203
Number of securities | 79 | 190
Total: Fair Value | $ 37,791 | $ 89,829
Total: Unrecognized Losses | 180 | 1,865
Debt Securities [Member] | Subordinated Debt [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 Months | 20,212 | 41,010
Less than 12 Months: Fair Value | 182 | $ 284
Less than 12 Months: Unrecognized Losses | 4,991 |
12 Months or More: Fair Value | $ 9 |
Number of securities | 6 | 7
Total: Fair Value | $ 25,203 | $ 41,010
Total: Unrecognized Losses | 191 | 284
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 Months |  | 42,712
Less than 12 Months: Fair Value |  | 753
Less than 12 Months: Unrecognized Losses | 10,088 | 12,730
12 Months or More: Fair Value | $ 298 | $ 595
Number of securities | 6 | 8
Total: Fair Value | $ 10,088 | $ 55,442
Total: Unrecognized Losses | 298 | 1,348
Residential Pass-Through Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 Months | 283 | 133,859
Less than 12 Months: Fair Value | 1 | 2,258
Less than 12 Months: Unrecognized Losses | 101,874 | 61,760
12 Months or More: Fair Value | $ 1,624 | $ 1,747
Number of securities | 86 | 131
Total: Fair Value | $ 102,157 | $ 195,619
Total: Unrecognized Losses | 1,625 | 4,005
Commercial Pass-Through Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 Months |  | 172,382
Less than 12 Months: Fair Value |  | 2,867
Less than 12 Months: Unrecognized Losses | 43,401 | 1,191
12 Months or More: Fair Value | $ 185 | $ 3
Number of securities | 8 | 35
Total: Fair Value | $ 43,401 | $ 173,573
Total: Unrecognized Losses | $ 185 | $ 2,870

X
- Definition Held to maturity number of securities. + References No definition available. + Details
Name: | krny_HeldToMaturityNumberOfSecurities
Namespace Prefix: | krny_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
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_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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