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LOANS RECEIVABLE - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 5,781,244 |  | $ 5,781,244 |  | $ 5,814,539
Unaccreted yield adjustments | (2,063) |  | (2,063) |  | (1,602)
Loans receivable | 5,779,181 |  | 5,779,181 |  | 5,812,937
Originated more than five years before current fiscal year, charge-offs |  |  | 2,072 |  | 1,136
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 400 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | 718 | $ 372 | 2,472 | $ 1,081 | 1,136
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | 0 |  | 0
Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 3,976,465 |  | 3,976,465 |  | 4,012,678
Commercial | Multi-family mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,555,001 |  | 2,555,001 |  | 2,709,654
Originated more than five years before current fiscal year, charge-offs |  |  | 1,195 |  | 0
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | 540 | 0 | 1,195 | 0 | 0
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | 0 |  | 0
Commercial | Nonresidential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,012,422 |  | 1,012,422 |  | 986,556
Originated more than five years before current fiscal year, charge-offs |  |  | 5 |  | 830
Originated current fiscal year, charge-offs |  |  | 0 |  |
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  |
Originated two years before current fiscal year, charge-offs |  |  | 0 |  |
Originated three years before current fiscal year, charge-offs |  |  | 0 |  |
Total period writeoff | 0 | 332 | 5 | 830 | 830
Originated four years before current fiscal year, charge-offs |  |  | 0 |  |
Revolving loans, charge-offs |  |  | 0 |  |
Commercial | Commercial business |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 201,277 |  | 201,277 |  | 138,755
Originated more than five years before current fiscal year, charge-offs |  |  | 814 |  | 295
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 400 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | 178 | 40 | 1,214 | 242 | 295
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | 0 |  | 0
Commercial | Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 207,765 |  | 207,765 |  | 177,713
Originated more than five years before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | 0 | 0 | 0 | 0 | 0
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | 0 |  | 0
Residential |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,741,023 |  | 1,741,023 |  | 1,748,591
Originated more than five years before current fiscal year, charge-offs |  |  | 47 |  | 2
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | 0 | 0 | 47 | 2 | 2
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | 0 |  | 0
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 63,756 |  | 63,756 |  | 53,270
Consumer | Home equity loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 61,379 |  | 61,379 |  | 50,737
Originated more than five years before current fiscal year, charge-offs |  |  | 11 |  | 2
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | 0 | 0 | 11 | 2 | 2
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | 0 |  | 0
Consumer | Other consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,377 |  | 2,377 |  | 2,533
Originated more than five years before current fiscal year, charge-offs |  |  | 0 |  | 7
Originated current fiscal year, charge-offs |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated two years before current fiscal year, charge-offs |  |  | 0 |  | 0
Originated three years before current fiscal year, charge-offs |  |  | 0 |  | 0
Total period writeoff | $ 0 | $ 0 | 0 | $ 5 | 7
Originated four years before current fiscal year, charge-offs |  |  | 0 |  | 0
Revolving loans, charge-offs |  |  | $ 0 |  | $ 0

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