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LOANS RECEIVABLE - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 5,800,300 |  | $ 5,800,300 |  | $ 5,748,750
Unaccreted yield adjustments | (8,542) |  | (8,542) |  | (15,963)
Loans receivable | 5,791,758 |  | 5,791,758 |  | 5,732,787
Originated more than five years before current fiscal year, writeoff |  |  | 709 |  | 6,421
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 580 | $ 4,238 | 709 | $ 6,460 | 10,276
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 3,391
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 464
Revolving loans, writeoff |  |  | 0 |  | 0
Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 3,985,261 |  | 3,985,261 |  | 3,945,910
Commercial | Multi-family mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,722,623 |  | 2,722,623 |  | 2,645,851
Originated more than five years before current fiscal year, writeoff |  |  | 0 |  | 398
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 0 | 354 | 0 | 354 | 398
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 0
Revolving loans, writeoff |  |  | 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 | 950,194 |  | 950,194 |  | 948,075
Originated more than five years before current fiscal year, writeoff |  |  | 498 |  | 5,975
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 498 | 3,689 | 498 | 5,722 | 5,975
Originated current fiscal year, writeoff |  |  | 0 |  |
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  |
Originated two years before current fiscal year, writeoff |  |  | 0 |  |
Originated three years before current fiscal year, writeoff |  |  | 0 |  |
Originated four years before current fiscal year, writeoff |  |  | 0 |  |
Revolving loans, writeoff |  |  | 0 |  |
Commercial | Commercial business |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 135,740 |  | 135,740 |  | 142,747
Originated more than five years before current fiscal year, writeoff |  |  | 202 |  | 11
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 75 | 158 | 202 | 347 | 3,866
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 3,391
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 464
Revolving loans, writeoff |  |  | 0 |  | 0
Commercial | Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 176,704 |  | 176,704 |  | 209,237
Originated more than five years before current fiscal year, writeoff |  |  | 0 |  | 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 0 | 0 | 0 | 0 | 0
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 0
Revolving loans, writeoff |  |  | 0 |  | 0
Residential |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,765,160 |  | 1,765,160 |  | 1,756,051
Originated more than five years before current fiscal year, writeoff |  |  | 2 |  | 37
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 0 | 37 | 2 | 37 | 37
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 0
Revolving loans, writeoff |  |  | 0 |  | 0
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 49,879 |  | 49,879 |  | 46,789
Consumer | Home equity loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 47,101 |  | 47,101 |  | 44,104
Originated more than five years before current fiscal year, writeoff |  |  | 2 |  | 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 2 | 0 | 2 | 0 | 0
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 0
Revolving loans, writeoff |  |  | 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 | 2,778 |  | 2,778 |  | 2,685
Originated more than five years before current fiscal year, writeoff |  |  | 5 |  | 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | $ 5 | $ 0 | 5 | $ 0 | 0
Originated current fiscal year, writeoff |  |  | 0 |  | 0
Originated fiscal year before current fiscal year, writeoff |  |  | 0 |  | 0
Originated two years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated three years before current fiscal year, writeoff |  |  | 0 |  | 0
Originated four years before current fiscal year, writeoff |  |  | 0 |  | 0
Revolving loans, writeoff |  |  | $ 0 |  | $ 0

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