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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | $ 44,923 | $ 44,939 | $ 46,872 | $ 48,734
Loans individually analyzed | 39,800 |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,786,205 | 5,748,750 |  |
Unaccreted yield adjustments | (1,959) | (15,963) |  |
Loans receivable | 5,784,246 | 5,732,787 |  |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 3,970,269 | 3,945,910 |  |
Commercial | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 24,368 | 24,125 | 25,590 | 26,362
Financing receivable, before allowance for credit loss, fee and loan in process | 2,646,187 | 2,645,851 |  |
Commercial | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 6,913 | 6,125 | 7,437 | 8,953
Financing receivable, before allowance for credit loss, fee and loan in process | 950,771 | 948,075 |  |
Commercial | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,705 | 1,573 | 1,413 | 1,440
Financing receivable, before allowance for credit loss, fee and loan in process | 145,984 | 142,747 |  |
Commercial | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,503 | 1,230 | 1,317 | 1,336
Financing receivable, before allowance for credit loss, fee and loan in process | 227,327 | 209,237 |  |
Residential |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 9,985 | 11,461 | 10,703 | 10,237
Financing receivable, before allowance for credit loss, fee and loan in process | 1,768,230 | 1,756,051 |  |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 47,706 | 46,789 |  |
Consumer | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 357 | 349 | 342 | 338
Financing receivable, before allowance for credit loss, fee and loan in process | 44,741 | 44,104 |  |
Consumer | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 92 | 76 | $ 70 | $ 68
Financing receivable, before allowance for credit loss, fee and loan in process | 2,965 | 2,685 |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 57 | 9 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 121 | 132 |  |
Loans individually analyzed | 2,155 | 1,584 |  |
Loans collectively evaluated | 13,406 | 14,105 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 28 | 31 |  |
Loans individually analyzed | 613 | 284 |  |
Loans collectively evaluated | 1,741 | 2,145 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 7 | 6 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 2,811 | 2,794 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 13 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 5,735 | 5,735 |  |
Receivables Acquired with Deteriorated Credit Quality | Residential |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 57 | 9 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 73 | 95 |  |
Loans individually analyzed | 1,519 | 1,276 |  |
Loans collectively evaluated | 3,119 | 3,431 |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 23 | 24 |  |
Loans collectively evaluated | 0 | 0 |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 698 | 853 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 44,047 | 43,945 |  |
Loans individually analyzed | 37,694 | 38,293 |  |
Loans collectively evaluated | 5,732,950 | 5,694,768 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 24,368 | 24,125 |  |
Loans individually analyzed | 21,980 | 22,591 |  |
Loans collectively evaluated | 2,624,207 | 2,623,260 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 493 | 517 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 6,392 | 5,577 |  |
Loans individually analyzed | 8,545 | 9,539 |  |
Loans collectively evaluated | 939,872 | 936,107 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 124 | 228 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,574 | 1,339 |  |
Loans individually analyzed | 579 | 714 |  |
Loans collectively evaluated | 142,594 | 139,239 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,490 | 1,230 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 221,592 | 203,502 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 81 | 108 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 9,774 | 11,249 |  |
Loans individually analyzed | 6,571 | 5,429 |  |
Loans collectively evaluated | 1,757,021 | 1,745,915 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 357 | 349 |  |
Loans individually analyzed | 19 | 20 |  |
Loans collectively evaluated | 44,699 | 44,060 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 92 | 76 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | $ 2,965 | $ 2,685 |  |

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