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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 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 | $ 44,455 | $ 44,457 | $ 44,939 | $ 44,930 | $ 44,867 | $ 48,734
Loans individually analyzed | 37,700 |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,850,449 |  | 5,748,750 |  |  |
Unaccreted yield adjustments | (4,274) |  | (15,963) |  |  |
Loans receivable | 5,846,175 |  | 5,732,787 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,036,426 |  | 3,945,910 |  |  |
Commercial | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 24,660 | 24,880 | 24,125 | 24,196 | 24,462 | 26,362
Financing receivable, before allowance for credit loss, fee and loan in process | 2,733,406 |  | 2,645,851 |  |  |
Commercial | Nonresidential mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 6,676 | 6,479 | 6,125 | 6,050 | 5,888 | 8,953
Financing receivable, before allowance for credit loss, fee and loan in process | 988,074 |  | 948,075 |  |  |
Commercial | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,517 | 1,563 | 1,573 | 1,545 | 1,293 | 1,440
Financing receivable, before allowance for credit loss, fee and loan in process | 140,224 |  | 142,747 |  |  |
Commercial | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,123 | 1,157 | 1,230 | 1,350 | 1,171 | 1,336
Financing receivable, before allowance for credit loss, fee and loan in process | 174,722 |  | 209,237 |  |  |
Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 9,958 | 9,855 | 11,461 | 11,375 | 11,653 | 10,237
Financing receivable, before allowance for credit loss, fee and loan in process | 1,761,465 |  | 1,756,051 |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 52,558 |  | 46,789 |  |  |
Consumer | Home equity loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 417 | 421 | 349 | 330 | 330 | 338
Financing receivable, before allowance for credit loss, fee and loan in process | 49,699 |  | 44,104 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 104 | $ 102 | 76 | $ 84 | $ 70 | $ 68
Financing receivable, before allowance for credit loss, fee and loan in process | 2,859 |  | 2,685 |  |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 12 |  | 9 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 147 |  | 132 |  |  |
Loans individually analyzed | 901 |  | 1,584 |  |  |
Loans collectively evaluated | 12,407 |  | 14,105 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 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] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 23 |  | 31 |  |  |
Loans individually analyzed | 250 |  | 284 |  |  |
Loans collectively evaluated | 1,618 |  | 2,145 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 35 |  | 6 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 1,459 |  | 2,794 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1 |  | 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] |  |  |  |  |  |
Related Allowance | 12 |  | 9 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 88 |  | 95 |  |  |
Loans individually analyzed | 629 |  | 1,276 |  |  |
Loans collectively evaluated | 3,595 |  | 3,431 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer | Home equity loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 |  | 0 |  |  |
Loans individually analyzed | 22 |  | 24 |  |  |
Loans collectively evaluated | 0 |  | 0 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 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] |  |  |  |  |  |
Related Allowance | 98 |  | 853 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 44,198 |  | 43,945 |  |  |
Loans individually analyzed | 36,779 |  | 38,293 |  |  |
Loans collectively evaluated | 5,800,362 |  | 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] |  |  |  |  |  |
Related Allowance | 8 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 24,652 |  | 24,125 |  |  |
Loans individually analyzed | 24,787 |  | 22,591 |  |  |
Loans collectively evaluated | 2,708,619 |  | 2,623,260 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Nonresidential mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 0 |  | 517 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 6,653 |  | 5,577 |  |  |
Loans individually analyzed | 5,543 |  | 9,539 |  |  |
Loans collectively evaluated | 980,663 |  | 936,107 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 50 |  | 228 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,432 |  | 1,339 |  |  |
Loans individually analyzed | 1,799 |  | 714 |  |  |
Loans collectively evaluated | 136,966 |  | 139,239 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,122 |  | 1,230 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 168,987 |  | 203,502 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 40 |  | 108 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 9,818 |  | 11,249 |  |  |
Loans individually analyzed | 4,547 |  | 5,429 |  |  |
Loans collectively evaluated | 1,752,694 |  | 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] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 417 |  | 349 |  |  |
Loans individually analyzed | 103 |  | 20 |  |  |
Loans collectively evaluated | 49,574 |  | 44,060 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related Allowance | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 104 |  | 76 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | $ 2,859 |  | $ 2,685 |  |  |

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