3.19.2 html 597 783 1 true 138 0 false 11 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Statements of Financial Condition Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfFinancialCondition Consolidated Statements of Financial Condition Statements 2 false false R3.htm 100020 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfFinancialConditionParenthetical Consolidated Statements of Financial Condition (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Consolidated Statements of Income Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 4 false false R5.htm 100040 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 100050 - Statement - Consolidated Statements of Changes in Stockholders' Equity Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfChangesInStockholdersEquity Consolidated Statements of Changes in Stockholders' Equity Statements 6 false false R7.htm 100060 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfChangesInStockholdersEquityParenthetical Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) Statements 7 false false R8.htm 100070 - Statement - Consolidated Statements of Cash Flows Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 100080 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 100090 - Disclosure - Recent Accounting Pronouncements Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureRecentAccountingPronouncements Recent Accounting Pronouncements Notes 10 false false R11.htm 100100 - Disclosure - Acquisition of Clifton Bancorp Inc. Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureAcquisitionOfCliftonBancorpInc Acquisition of Clifton Bancorp Inc. Notes 11 false false R12.htm 100110 - Disclosure - Securities Available for Sale Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSale Securities Available for Sale Notes 12 false false R13.htm 100120 - Disclosure - Securities Held to Maturity Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturity Securities Held to Maturity Notes 13 false false R14.htm 100130 - Disclosure - Impairment of Securities Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureImpairmentOfSecurities Impairment of Securities Notes 14 false false R15.htm 100140 - Disclosure - Loans Receivable Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoansReceivable Loans Receivable Notes 15 false false R16.htm 100150 - Disclosure - Loan Quality and Allowance for Loan Losses Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLosses Loan Quality and Allowance for Loan Losses Notes 16 false false R17.htm 100160 - Disclosure - Premises and Equipment Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosurePremisesAndEquipment Premises and Equipment Notes 17 false false R18.htm 100170 - Disclosure - Goodwill and Other Intangible Assets Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets Notes 18 false false R19.htm 100180 - Disclosure - Deposits Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDeposits Deposits Notes 19 false false R20.htm 100190 - Disclosure - Borrowings Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBorrowings Borrowings Notes 20 false false R21.htm 100200 - Disclosure - Derivative Instruments and Hedging Activities Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities Derivative Instruments and Hedging Activities Notes 21 false false R22.htm 100210 - Disclosure - Benefit Plans Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlans Benefit Plans Notes 22 false false R23.htm 100220 - Disclosure - Stockholders' Equity Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureStockholdersEquity Stockholders' Equity Notes 23 false false R24.htm 100230 - Disclosure - Income Taxes Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxes Income Taxes Notes 24 false false R25.htm 100240 - Disclosure - Commitments Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitments Commitments Notes 25 false false R26.htm 100250 - Disclosure - Fair Value of Financial Instruments Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstruments Fair Value of Financial Instruments Notes 26 false false R27.htm 100260 - Disclosure - Comprehensive Income Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureComprehensiveIncome Comprehensive Income Notes 27 false false R28.htm 100270 - Disclosure - Revenue Recognition Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureRevenueRecognition Revenue Recognition Notes 28 false false R29.htm 100280 - Disclosure - Parent Only Financial Information Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureParentOnlyFinancialInformation Parent Only Financial Information Notes 29 false false R30.htm 100290 - Disclosure - Net Income per Common Share (EPS) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureNetIncomePerCommonShareEPS Net Income per Common Share (EPS) Notes 30 false false R31.htm 100300 - Disclosure - Quarterly Results of Operations Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureQuarterlyResultsOfOperations Quarterly Results of Operations Notes 31 false false R32.htm 100310 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 32 false false R33.htm 100320 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 33 false false R34.htm 100330 - Disclosure - Acquisition of Clifton Bancorp Inc. (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureAcquisitionOfCliftonBancorpIncTables Acquisition of Clifton Bancorp Inc. (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureAcquisitionOfCliftonBancorpInc 34 false false R35.htm 100340 - Disclosure - Securities Available for Sale (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSaleTables Securities Available for Sale (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSale 35 false false R36.htm 100350 - Disclosure - Securities Held to Maturity (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturityTables Securities Held to Maturity (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturity 36 false false R37.htm 100360 - Disclosure - Impairment of Securities (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureImpairmentOfSecuritiesTables Impairment of Securities (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureImpairmentOfSecurities 37 false false R38.htm 100370 - Disclosure - Loans Receivable (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoansReceivableTables Loans Receivable (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoansReceivable 38 false false R39.htm 100380 - Disclosure - Loan Quality and Allowance for Loan Losses (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesTables Loan Quality and Allowance for Loan Losses (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLosses 39 false false R40.htm 100390 - Disclosure - Premises and Equipment (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosurePremisesAndEquipmentTables Premises and Equipment (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosurePremisesAndEquipment 40 false false R41.htm 100400 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets 41 false false R42.htm 100410 - Disclosure - Deposits (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDepositsTables Deposits (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDeposits 42 false false R43.htm 100420 - Disclosure - Borrowings (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBorrowingsTables Borrowings (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBorrowings 43 false false R44.htm 100430 - Disclosure - Derivative Instruments and Hedging Activities (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables Derivative Instruments and Hedging Activities (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities 44 false false R45.htm 100440 - Disclosure - Benefit Plans (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansTables Benefit Plans (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlans 45 false false R46.htm 100450 - Disclosure - Stockholders' Equity (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureStockholdersEquityTables Stockholders' Equity (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureStockholdersEquity 46 false false R47.htm 100460 - Disclosure - Income Taxes (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxes 47 false false R48.htm 100470 - Disclosure - Commitments (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitmentsTables Commitments (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitments 48 false false R49.htm 100480 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstruments 49 false false R50.htm 100490 - Disclosure - Comprehensive Income (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureComprehensiveIncomeTables Comprehensive Income (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureComprehensiveIncome 50 false false R51.htm 100500 - Disclosure - Revenue Recognition (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables Revenue Recognition (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureRevenueRecognition 51 false false R52.htm 100510 - Disclosure - Parent Only Financial Information (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureParentOnlyFinancialInformationTables Parent Only Financial Information (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureParentOnlyFinancialInformation 52 false false R53.htm 100520 - Disclosure - Net Income Per Common Share (EPS) (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureNetIncomePerCommonShareEPSTables Net Income Per Common Share (EPS) (Tables) Tables 53 false false R54.htm 100530 - Disclosure - Quarterly Results of Operations (Tables) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureQuarterlyResultsOfOperationsTables Quarterly Results of Operations (Tables) Tables http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureQuarterlyResultsOfOperations 54 false false R55.htm 100540 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 55 false false R56.htm 100550 - Disclosure - Summary of Significant Accounting Policies - Property, Plant and Equipment Useful Lives (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentUsefulLivesDetail Summary of Significant Accounting Policies - Property, Plant and Equipment Useful Lives (Detail) Details 56 false false R57.htm 100560 - Disclosure - Recent Accounting Pronouncements - Additional Information (Details) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureRecentAccountingPronouncementsAdditionalInformationDetails Recent Accounting Pronouncements - Additional Information (Details) Details 57 false false R58.htm 100570 - Disclosure - Acquisition of Clifton Bancorp Inc. - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureAcquisitionOfCliftonBancorpIncAdditionalInformationDetail Acquisition of Clifton Bancorp Inc. - Additional Information (Detail) Details 58 false false R59.htm 100580 - Disclosure - Acquisition of Clifton Bancorp Inc. - Summary of Assets Acquired and Liabilities Assumed Through Merger at Fair Value (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureAcquisitionOfCliftonBancorpIncSummaryOfAssetsAcquiredAndLiabilitiesAssumedThroughMergerAtFairValueDetail Acquisition of Clifton Bancorp Inc. - Summary of Assets Acquired and Liabilities Assumed Through Merger at Fair Value (Detail) Details 59 false false R60.htm 100590 - Disclosure - Acquisition of Clifton Bancorp Inc. - Summary of Unaudited Supplemental Pro Forma Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureAcquisitionOfCliftonBancorpIncSummaryOfUnauditedSupplementalProFormaInformationDetail Acquisition of Clifton Bancorp Inc. - Summary of Unaudited Supplemental Pro Forma Information (Detail) Details 60 false false R61.htm 100600 - Disclosure - Securities Available for Sale - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSaleAmortizedCostGrossUnrealizedGainsAndLossesAndFairValuesOfSecuritiesDetail Securities Available for Sale - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) Details 61 false false R62.htm 100610 - Disclosure - Securities Available for Sale - Stratification by Contractual Maturity of Securities (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSaleStratificationByContractualMaturityOfSecuritiesDetail Securities Available for Sale - Stratification by Contractual Maturity of Securities (Detail) Details 62 false false R63.htm 100620 - Disclosure - Securities Available for Sale - Sales of Securities Available for Sale (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSaleSalesOfSecuritiesAvailableForSaleDetail Securities Available for Sale - Sales of Securities Available for Sale (Detail) Details 63 false false R64.htm 100630 - Disclosure - Securities Available for Sale - Schedule Of Available For Sale Securities Pledged (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesAvailableForSaleScheduleOfAvailableForSaleSecuritiesPledgedDetail Securities Available for Sale - Schedule Of Available For Sale Securities Pledged (Detail) Details 64 false false R65.htm 100640 - Disclosure - Securities Held to Maturity - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturityAmortizedCostGrossUnrealizedGainsAndLossesAndFairValuesOfSecuritiesDetail Securities Held to Maturity - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values of Securities (Detail) Details 65 false false R66.htm 100650 - Disclosure - Securities Held to Maturity - Stratification by Contractual Maturity of Securities (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturityStratificationByContractualMaturityOfSecuritiesDetail Securities Held to Maturity - Stratification by Contractual Maturity of Securities (Detail) Details 66 false false R67.htm 100660 - Disclosure - Securities Held to Maturity - Schedule Of Sale Of Securities Held Maturity (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturityScheduleOfSaleOfSecuritiesHeldMaturityDetail Securities Held to Maturity - Schedule Of Sale Of Securities Held Maturity (Detail) Details 67 false false R68.htm 100670 - Disclosure - Securities Held to Maturity - Schedule Of Sale Of Securities Held Maturity (Parenthetical) (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturityScheduleOfSaleOfSecuritiesHeldMaturityParentheticalDetail Securities Held to Maturity - Schedule Of Sale Of Securities Held Maturity (Parenthetical) (Detail) Details 68 false false R69.htm 100680 - Disclosure - Securities Held to Maturity - Schedule Of Held To Maturity Securities Pledged (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureSecuritiesHeldToMaturityScheduleOfHeldToMaturitySecuritiesPledgedDetail Securities Held to Maturity - Schedule Of Held To Maturity Securities Pledged (Detail) Details 69 false false R70.htm 100690 - Disclosure - Impairment of Securities - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureImpairmentOfSecuritiesScheduleOfFairValuesAndGrossUnrealizedAndUnrecognizedLossesOnInvestmentsDetail Impairment of Securities - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Detail) Details 70 false false R71.htm 100700 - Disclosure - Impairment of Securities - Schedule of Temporary Impairment Losses, Investments (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureImpairmentOfSecuritiesScheduleOfTemporaryImpairmentLossesInvestmentsDetail Impairment of Securities - Schedule of Temporary Impairment Losses, Investments (Detail) Details 71 false false R72.htm 100710 - Disclosure - Loans Receivable - Schedule of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoansReceivableScheduleOfLoansReceivableDetail Loans Receivable - Schedule of Loans Receivable (Detail) Details 72 false false R73.htm 100720 - Disclosure - Loans Receivable - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoansReceivableAdditionalInformationDetail Loans Receivable - Additional Information (Detail) Details 73 false false R74.htm 100730 - Disclosure - Loan Quality and Allowance for Loan Losses - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesAdditionalInformationDetail Loan Quality and Allowance for Loan Losses - Additional Information (Detail) Details 74 false false R75.htm 100740 - Disclosure - Loan Quality and Allowance for Loan Losses - Allowance for Loan Losses and Balance of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesAllowanceForLoanLossesAndBalanceOfLoansReceivableDetail Loan Quality and Allowance for Loan Losses - Allowance for Loan Losses and Balance of Loans Receivable (Detail) Details 75 false false R76.htm 100750 - Disclosure - Loan Quality and Allowance for Loan Losses - Credit-Rating Classification of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesCreditRatingClassificationOfLoansReceivableDetail Loan Quality and Allowance for Loan Losses - Credit-Rating Classification of Loans Receivable (Detail) Details 76 false false R77.htm 100760 - Disclosure - Loan Quality and Allowance for Loan Losses - Contractual Payment Status of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesContractualPaymentStatusOfLoansReceivableDetail Loan Quality and Allowance for Loan Losses - Contractual Payment Status of Loans Receivable (Detail) Details 77 false false R78.htm 100770 - Disclosure - Loan Quality and Allowance for Loan Losses - Performance Status of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesPerformanceStatusOfLoansReceivableDetail Loan Quality and Allowance for Loan Losses - Performance Status of Loans Receivable (Detail) Details 78 false false R79.htm 100780 - Disclosure - Loan Quality and Allowance for Loan Losses - Impairment Status of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesImpairmentStatusOfLoansReceivableDetail Loan Quality and Allowance for Loan Losses - Impairment Status of Loans Receivable (Detail) Details 79 false false R80.htm 100790 - Disclosure - Loan Quality and Allowance for Loan Losses - Troubled Debt Restructurings of Loans Receivable (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureLoanQualityAndAllowanceForLoanLossesTroubledDebtRestructuringsOfLoansReceivableDetail Loan Quality and Allowance for Loan Losses - Troubled Debt Restructurings of Loans Receivable (Detail) Details 80 false false R81.htm 100800 - Disclosure - Premises and Equipment - Property, Plant and Equipment (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosurePremisesAndEquipmentPropertyPlantAndEquipmentDetail Premises and Equipment - Property, Plant and Equipment (Detail) Details 81 false false R82.htm 100810 - Disclosure - Premises and Equipment - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosurePremisesAndEquipmentAdditionalInformationDetail Premises and Equipment - Additional Information (Detail) Details 82 false false R83.htm 100820 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Intangible Assets and Goodwill (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsScheduleOfIntangibleAssetsAndGoodwillDetail Goodwill and Other Intangible Assets - Schedule of Intangible Assets and Goodwill (Detail) Details 83 false false R84.htm 100830 - Disclosure - Goodwill and Other Intangible Assets - Scheduled Amortization of Core Deposit Intangibles (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsScheduledAmortizationOfCoreDepositIntangiblesDetail Goodwill and Other Intangible Assets - Scheduled Amortization of Core Deposit Intangibles (Detail) Details 84 false false R85.htm 100840 - Disclosure - Deposits - Schedule of Deposits (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDepositsScheduleOfDepositsDetail Deposits - Schedule of Deposits (Detail) Details 85 false false R86.htm 100850 - Disclosure - Deposits - Schedule of Brokered Deposits (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDepositsScheduleOfBrokeredDepositsDetail Deposits - Schedule of Brokered Deposits (Detail) Details 86 false false R87.htm 100860 - Disclosure - Deposits - Certificates of Deposit By Maturity (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDepositsCertificatesOfDepositByMaturityDetail Deposits - Certificates of Deposit By Maturity (Detail) Details 87 false false R88.htm 100870 - Disclosure - Deposits - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDepositsAdditionalInformationDetail Deposits - Additional Information (Detail) Details 88 false false R89.htm 100880 - Disclosure - Borrowings - Schedule of Fixed Rate Advances from FHLB (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBorrowingsScheduleOfFixedRateAdvancesFromFHLBDetail Borrowings - Schedule of Fixed Rate Advances from FHLB (Detail) Details 89 false false R90.htm 100890 - Disclosure - Borrowings - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetail Borrowings - Additional Information (Detail) Details 90 false false R91.htm 100900 - Disclosure - Derivative Instruments and Hedging Activities - Fair Values of Derivative Financial Instruments as well as Their Classification on Statement of Financial Condition (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesFairValuesOfDerivativeFinancialInstrumentsAsWellAsTheirClassificationOnStatementOfFinancialConditionDetail Derivative Instruments and Hedging Activities - Fair Values of Derivative Financial Instruments as well as Their Classification on Statement of Financial Condition (Detail) Details 91 false false R92.htm 100910 - Disclosure - Derivative Instruments and Hedging Activities - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesAdditionalInformationDetail Derivative Instruments and Hedging Activities - Additional Information (Detail) Details 92 false false R93.htm 100920 - Disclosure - Derivative Instruments and Hedging Activities - Pre-tax Effects of Derivative Instruments on Consolidated Statements of Income (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesPreTaxEffectsOfDerivativeInstrumentsOnConsolidatedStatementsOfIncomeDetail Derivative Instruments and Hedging Activities - Pre-tax Effects of Derivative Instruments on Consolidated Statements of Income (Detail) Details 93 false false R94.htm 100930 - Disclosure - Derivative Instruments and Hedging Activities - Offsetting Derivatives (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesOffsettingDerivativesDetail Derivative Instruments and Hedging Activities - Offsetting Derivatives (Detail) Details 94 false false R95.htm 100940 - Disclosure - Benefit Plans - Schedule of Net Periodic Benefit Expense (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfNetPeriodicBenefitExpenseDetail Benefit Plans - Schedule of Net Periodic Benefit Expense (Detail) Details 95 false false R96.htm 100950 - Disclosure - Benefit Plans - Schedule of Impact of Retrospective Application to Consolidated Statement of Income (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfImpactOfRetrospectiveApplicationToConsolidatedStatementOfIncomeDetail Benefit Plans - Schedule of Impact of Retrospective Application to Consolidated Statement of Income (Detail) Details 96 false false R97.htm 100960 - Disclosure - Benefit Plans - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansAdditionalInformationDetail Benefit Plans - Additional Information (Detail) Details 97 false false R98.htm 100970 - Disclosure - Benefit Plans - Schedule of Employee Stock Ownership Plan (ESOP) Disclosures (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresDetail Benefit Plans - Schedule of Employee Stock Ownership Plan (ESOP) Disclosures (Detail) Details 98 false false R99.htm 100980 - Disclosure - Benefit Plans - Schedule of Net Funded Status (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfNetFundedStatusDetail Benefit Plans - Schedule of Net Funded Status (Detail) Details 99 false false R100.htm 101000 - Disclosure - Benefit Plans - Schedule of Net Benefit Costs (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfNetBenefitCostsDetail Benefit Plans - Schedule of Net Benefit Costs (Detail) Details 100 false false R101.htm 101010 - Disclosure - Benefit Plans - Schedule of Expected Benefit Payments (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfExpectedBenefitPaymentsDetail Benefit Plans - Schedule of Expected Benefit Payments (Detail) Details 101 false false R102.htm 101020 - Disclosure - Benefit Plans - Schedule of Fair Value Measurements of ABRIP's Assets (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfFairValueMeasurementsOfABRIPSAssetsDetail Benefit Plans - Schedule of Fair Value Measurements of ABRIP's Assets (Detail) Details 102 false false R103.htm 101030 - Disclosure - Benefit Plans - Schedule of Assumptions to Estimate the Fair Value of the Options Granted (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansScheduleOfAssumptionsToEstimateFairValueOfOptionsGrantedDetail Benefit Plans - Schedule of Assumptions to Estimate the Fair Value of the Options Granted (Detail) Details 103 false false R104.htm 101040 - Disclosure - Benefit Plans - Summary of the Company's Stock Option Activity (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansSummaryOfCompanySStockOptionActivityDetail Benefit Plans - Summary of the Company's Stock Option Activity (Detail) Details 104 false false R105.htm 101050 - Disclosure - Benefit Plans - Summary of the Status of the Company's Non-vested Restricted Share Awards (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureBenefitPlansSummaryOfStatusOfCompanySNonVestedRestrictedShareAwardsDetail Benefit Plans - Summary of the Status of the Company's Non-vested Restricted Share Awards (Detail) Details 105 false false R106.htm 101060 - Disclosure - Stockholders' Equity - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetail Stockholders' Equity - Additional Information (Detail) Details 106 false false R107.htm 101070 - Disclosure - Stockholders' Equity - Summary of Bank's Regulatory Capital Levels (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureStockholdersEquitySummaryOfBankSRegulatoryCapitalLevelsDetail Stockholders' Equity - Summary of Bank's Regulatory Capital Levels (Detail) Details 107 false false R108.htm 101080 - Disclosure - Stockholders' Equity - Summary of Company's Regulatory Capital Levels (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureStockholdersEquitySummaryOfCompanySRegulatoryCapitalLevelsDetail Stockholders' Equity - Summary of Company's Regulatory Capital Levels (Detail) Details 108 false false R109.htm 101090 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 109 false false R110.htm 101100 - Disclosure - Income Taxes - Schedule of Components of Income Taxes (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxesScheduleOfComponentsOfIncomeTaxesDetail Income Taxes - Schedule of Components of Income Taxes (Detail) Details 110 false false R111.htm 101110 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetail Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) Details 111 false false R112.htm 101120 - Disclosure - Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredIncomeTaxAssetsAndLiabilitiesDetail Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Detail) Details 112 false false R113.htm 101130 - Disclosure - Commitments - Schedule of Future Minimum Rental Payments under Operating Leases (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumRentalPaymentsUnderOperatingLeasesDetail Commitments - Schedule of Future Minimum Rental Payments under Operating Leases (Detail) Details 113 false false R114.htm 101140 - Disclosure - Commitments - Schedule of Composition of Total Rental Expense for Operating Leases (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitmentsScheduleOfCompositionOfTotalRentalExpenseForOperatingLeasesDetail Commitments - Schedule of Composition of Total Rental Expense for Operating Leases (Detail) Details 114 false false R115.htm 101150 - Disclosure - Commitments - Schedule of Outstanding Loan Commitments (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitmentsScheduleOfOutstandingLoanCommitmentsDetail Commitments - Schedule of Outstanding Loan Commitments (Detail) Details 115 false false R116.htm 101160 - Disclosure - Commitments - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetail Commitments - Additional Information (Detail) Details 116 false false R117.htm 101170 - Disclosure - Fair Value of Financial Instruments - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetail Fair Value of Financial Instruments - Additional Information (Detail) Details 117 false false R118.htm 101180 - Disclosure - Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) Details 118 false false R119.htm 101190 - Disclosure - Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasisDetail Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Detail) Details 119 false false R120.htm 101200 - Disclosure - Fair Value of Financial Instruments - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfQuantitativeInformationAboutLevel3FairValueMeasurementsDetail Fair Value of Financial Instruments - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Detail) Details 120 false false R121.htm 101210 - Disclosure - Fair Value of Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentsDetail Fair Value of Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) Details 121 false false R122.htm 101220 - Disclosure - Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureComprehensiveIncomeScheduleOfAccumulatedOtherComprehensiveIncomeLossDetail Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) Details 122 false false R123.htm 101230 - Disclosure - Comprehensive Income - Schedule of Comprehensive Income (Loss) (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureComprehensiveIncomeScheduleOfComprehensiveIncomeLossDetail Comprehensive Income - Schedule of Comprehensive Income (Loss) (Detail) Details 123 false false R124.htm 101240 - Disclosure - Revenue Recognition - Non Interest Income (Details) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureRevenueRecognitionNonInterestIncomeDetails Revenue Recognition - Non Interest Income (Details) Details 124 false false R125.htm 101250 - Disclosure - Parent Only Financial Information - Condensed Statements of Financial Condition (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureParentOnlyFinancialInformationCondensedStatementsOfFinancialConditionDetail Parent Only Financial Information - Condensed Statements of Financial Condition (Detail) Details 125 false false R126.htm 101260 - Disclosure - Parent Only Financial Information - Condensed Statements of Income and Comprehensive Income (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureParentOnlyFinancialInformationCondensedStatementsOfIncomeAndComprehensiveIncomeDetail Parent Only Financial Information - Condensed Statements of Income and Comprehensive Income (Detail) Details 126 false false R127.htm 101270 - Disclosure - Parent Only Financial Information - Condensed Statements of Cash Flows (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureParentOnlyFinancialInformationCondensedStatementsOfCashFlowsDetail Parent Only Financial Information - Condensed Statements of Cash Flows (Detail) Details 127 false false R128.htm 101280 - Disclosure - Net Income per Common Share (EPS) - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Computations (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureNetIncomePerCommonShareEPSReconciliationOfNumeratorsAndDenominatorsOfBasicAndDilutedEarningsPerShareComputationsDetail Net Income per Common Share (EPS) - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Computations (Detail) Details http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureNetIncomePerCommonShareEPS 128 false false R129.htm 101290 - Disclosure - Net Income per Common Share (EPS) - Additional Information (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureNetIncomePerCommonShareEPSAdditionalInformationDetail Net Income per Common Share (EPS) - Additional Information (Detail) Details http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureNetIncomePerCommonShareEPS 129 false false R130.htm 101300 - Disclosure - Quarterly Results of Operations - Summary of Quarterly Results of Operations (Detail) Sheet http://www.kearnyfederalsavings.com/20190630/taxonomy/role/DisclosureQuarterlyResultsOfOperationsSummaryOfQuarterlyResultsOfOperationsDetail Quarterly Results of Operations - Summary of Quarterly Results of Operations (Detail) Details 130 false false All Reports Book All Reports krny-20190630.xml krny-20190630.xsd krny-20190630_cal.xml krny-20190630_def.xml krny-20190630_lab.xml krny-20190630_pre.xml http://xbrl.sec.gov/dei/2018-01-31 http://xbrl.sec.gov/invest/2013-01-31 http://fasb.org/srt/2018-01-31 http://fasb.org/us-gaap/2018-01-31 true true