Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities:
Net Income	$ 67,547,000	$ 63,233,000	$ 44,965,000
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	5,971,000	5,862,000	4,647,000
Net accretion of premiums, discounts and loan fees and costs	(5,669,000)	(13,214,000)	(9,457,000)
Deferred income taxes and valuation allowance	5,023,000	4,154,000	665,000
Bargain purchase gain	0	(3,053,000)	0
Amortization of intangible assets	685,000	980,000	1,165,000
Amortization (accretion) of benefit plans' unrecognized net loss (gain)	1,003,000	320,000	(328,000)
(Reversal of) provision for credit losses	(7,518,000)	(1,121,000)	4,197,000
(Gain) loss on sale and write-down of other real estate owned	(5,000)	0	28,000
Loans originated for sale	(179,727,000)	(281,086,000)	(290,800,000)
Proceeds from sale of mortgage loans held-for-sale	196,796,000	290,530,000	285,436,000
Gain on sale of mortgage loans held-for-sale, net	(2,415,000)	(5,147,000)	(3,159,000)
Realized loss (gain) on sale/call of securities available for sale	559,000	(767,000)	(2,250,000)
Realized loss on debt extinguishment	0	796,000	2,156,000
Realized gain on sale of loans receivable	(124,000)	(427,000)	(27,000)
Realized (gain) loss on disposition of premises and equipment	(363,000)	(971,000)	383,000
Loss on write-down of premises	0	1,938,000	0
Increase in cash surrender value of bank owned life insurance	(6,167,000)	(6,267,000)	(6,225,000)
ESOP and stock-based compensation expense	6,340,000	7,742,000	8,233,000
(Increase) decrease in interest receivable	(1,104,000)	(288,000)	1,987,000
Decrease (increase) in other assets	7,922,000	(4,454,000)	(35,290,000)
Increase (decrease) in interest payable	853,000	(638,000)	(4,887,000)
Increase (decrease) in other liabilities	(8,306,000)	17,295,000	17,885,000
Net Cash Provided by Operating Activities	81,301,000	75,417,000	19,324,000
Purchases of:
Investment securities available for sale	(229,145,000)	(918,668,000)	(487,898,000)
Investment securities held to maturity	(86,406,000)	(12,321,000)	0
Proceeds from:
Repayments/calls/maturities of investment securities available for sale	330,152,000	517,511,000	213,052,000
Repayments/calls/maturities of investment securities held to maturity	6,116,000	6,595,000	6,175,000
Sale of investment securities available for sale	100,336,000	98,084,000	164,299,000
Purchase of loans	(123,389,000)	(81,707,000)	(73,262,000)
Net (increase) decrease in loans receivable	(467,236,000)	232,660,000	264,109,000
Proceeds from sale of loans receivable	1,450,000	44,801,000	497,000
Purchase of interest rate caps	0	0	(1,476,000)
Proceeds from sale of other real estate owned	708,000	0	0
Additions to premises and equipment	(2,920,000)	(5,458,000)	(5,960,000)
Proceeds from death benefit of bank owned life insurance	300,000	0	0
Proceeds from cash settlement of premises and equipment	612,000	4,852,000	395,000
Purchase of FHLB stock	(30,382,000)	(37,000)	(4,500,000)
Redemption of FHLB stock	19,853,000	25,421,000	10,036,000
Net cash acquired in acquisition	0	4,296,000	0
Net Cash (Used in) Provided by Investing Activities	(479,951,000)	(83,971,000)	85,467,000
Cash Flows from Financing Activities:
Net increase in deposits	377,606,000	596,583,000	283,726,000
Repayment of term FHLB advances	(4,100,000,000)	(2,847,796,000)	(3,508,146,000)
Proceeds from term FHLB advances	4,085,000,000	2,345,000,000	3,390,000,000
Net increase (decrease) in other short-term borrowings	230,000,000	(48,635,000)	(33,035,000)
Net increase (decrease) in advance payments by borrowers for taxes	994,000	(1,611,000)	(318,000)
Repurchase and cancellation of common stock of Kearny Financial Corp.	(129,520,000)	(119,021,000)	(69,782,000)
Cancellation of shares repurchased on vesting to pay taxes	(977,000)	(803,000)	(1,083,000)
Exercise of stock options		373,000
Cash Dividends paid	(30,693,000)	(28,648,000)	(24,121,000)
Net Cash Used In Financing Activities	432,410,000	(104,558,000)	37,241,000
Net Increase (Decrease) in Cash and Cash Equivalents	33,760,000	(113,112,000)	142,032,000
Cash and Cash Equivalents - Beginning	67,855,000	180,967,000	38,935,000
Cash and Cash Equivalents - Ending	101,615,000	67,855,000	180,967,000
Cash paid during the year for:
Income taxes, net of refunds	15,552,000	19,734,000	11,812,000
Interest	28,816,000	50,488,000	88,740,000
Non-cash investing and financing activities:
Transfers from loans receivable to loans held-for-sale	27,036,000	43,579,000
Acquisition of other real estate owned in settlement of loans	$ 703,000		206,000
Fair value of assets acquired, net of cash and cash equivalents acquired		567,816,000
Fair value of liabilities assumed		$ 523,926,000
ASU 2019-04 [Member]
Non-cash investing and financing activities:
Debt securities transferred from held to maturity to available for sale			537,732,000
ASU 2016-02 [Member]
Non-cash investing and financing activities:
Operating lease right-of-use assets			17,243,000
Operating lease liabilities			$ 17,758,000