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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | $ 44,867 | $ 46,872 | $ 48,734 | $ 48,877 | $ 47,613 | $ 47,058
Loans individually analyzed | 28,100 |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,756,938 |  | 5,850,476 |  |  |
Unaccreted yield adjustments | (11,309) |  | (21,055) |  |  |
Loans receivable | 5,745,629 |  | 5,829,421 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 3,964,628 |  | 4,103,819 |  |  |
Commercial | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 24,462 | 25,590 | 26,362 | 27,498 | 26,246 | 25,321
Financing receivable, before allowance for credit loss, fee and loan in process | 2,651,274 |  | 2,761,775 |  |  |
Commercial | Nonresidential mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 5,888 | 7,437 | 8,953 | 8,593 | 9,152 | 10,590
Financing receivable, before allowance for credit loss, fee and loan in process | 947,287 |  | 968,574 |  |  |
Commercial | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,293 | 1,413 | 1,440 | 1,819 | 1,972 | 1,792
Financing receivable, before allowance for credit loss, fee and loan in process | 144,134 |  | 146,861 |  |  |
Commercial | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,171 | 1,317 | 1,336 | 1,201 | 1,120 | 1,486
Financing receivable, before allowance for credit loss, fee and loan in process | 221,933 |  | 226,609 |  |  |
Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 11,653 | 10,703 | 10,237 | 9,355 | 8,801 | 7,540
Financing receivable, before allowance for credit loss, fee and loan in process | 1,746,065 |  | 1,700,559 |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 46,245 |  | 46,098 |  |  |
Consumer | Home equity loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 330 | 342 | 338 | 339 | 244 | 245
Financing receivable, before allowance for credit loss, fee and loan in process | 43,517 |  | 43,549 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 70 | $ 70 | 68 | $ 72 | $ 78 | $ 84
Financing receivable, before allowance for credit loss, fee and loan in process | 2,728 |  | 2,549 |  |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 3 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 165 |  | 211 |  |  |
Loans individually analyzed | 1,790 |  | 928 |  |  |
Loans collectively evaluated | 16,210 |  | 17,967 |  |  |
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 | 38 |  | 70 |  |  |
Loans individually analyzed | 313 |  | 333 |  |  |
Loans collectively evaluated | 2,269 |  | 3,562 |  |  |
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 | 42 |  | 9 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 4,774 |  | 4,237 |  |  |
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 | 0 |  | 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 | 0 |  | 3 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 85 |  | 132 |  |  |
Loans individually analyzed | 1,452 |  | 570 |  |  |
Loans collectively evaluated | 3,432 |  | 4,433 |  |  |
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 | 25 |  | 25 |  |  |
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 | 154 |  | 3,417 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 44,548 |  | 45,103 |  |  |
Loans individually analyzed | 26,299 |  | 41,699 |  |  |
Loans collectively evaluated | 5,712,639 |  | 5,789,882 |  |  |
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 | 35 |  | 326 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 24,427 |  | 26,036 |  |  |
Loans individually analyzed | 15,988 |  | 19,114 |  |  |
Loans collectively evaluated | 2,635,286 |  | 2,742,661 |  |  |
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 | 0 |  | 3,001 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 5,850 |  | 5,882 |  |  |
Loans individually analyzed | 4,022 |  | 16,207 |  |  |
Loans collectively evaluated | 940,683 |  | 948,472 |  |  |
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 | 106 |  | 20 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,145 |  | 1,411 |  |  |
Loans individually analyzed | 815 |  | 252 |  |  |
Loans collectively evaluated | 138,545 |  | 142,372 |  |  |
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 | 1,171 |  | 1,336 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 216,198 |  | 220,874 |  |  |
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 | 13 |  | 70 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 11,555 |  | 10,032 |  |  |
Loans individually analyzed | 5,452 |  | 6,101 |  |  |
Loans collectively evaluated | 1,735,729 |  | 1,689,455 |  |  |
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 | 330 |  | 338 |  |  |
Loans individually analyzed | 22 |  | 25 |  |  |
Loans collectively evaluated | 43,470 |  | 43,499 |  |  |
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 | 70 |  | 68 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | $ 2,728 |  | $ 2,549 |  |  |

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