LOANS RECEIVABLE - Schedule of Loans Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 5,976,368	$ 5,436,576
Unaccreted yield adjustments	(10,043)	(18,731)
Loans receivable	5,966,325	5,417,845
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	4,216,057	3,745,866
Commercial Portfolio Segment | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,835,852	2,409,090
Commercial Portfolio Segment | Nonresidential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,002,643	1,019,838
Commercial Portfolio Segment | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	162,038	176,807
Commercial Portfolio Segment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	215,524	140,131
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,713,343	1,645,816
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	46,968	44,894
Consumer Loans | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	44,376	42,028
Consumer Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 2,592	$ 2,866