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LOANS RECEIVABLE - Schedule of Loans Receivable (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($) property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 5,775,090	$ 5,850,476
Unaccreted yield adjustments	(16,754)	(21,055)
Loans receivable	5,758,336	5,829,421
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	3,987,517	4,103,819
Commercial | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,645,195	2,761,775
Commercial | Nonresidential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	965,539	968,574
Real estate acquired through foreclosure		$ 13,000
Real estate acquired through foreclosure, number of properties | property		1
Commercial | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	147,326	$ 146,861
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	229,457	226,609
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,741,644	1,700,559
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	45,929	46,098
Consumer | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	42,731	43,549
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 3,198	$ 2,549

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Real Estate Acquired Through Foreclosure, Number Of Properties

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Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-4

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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