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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | 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 | $ 46,872 | $ 48,734 | $ 47,613 | $ 47,058
Loans individually analyzed | 37,900 |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,760,475 | 5,850,476 |  |
Unaccreted yield adjustments | (24,426) | (21,055) |  |
Loans receivable | 5,736,049 | 5,829,421 |  |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,025,884 | 4,103,819 |  |
Commercial | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 25,590 | 26,362 | 26,246 | 25,321
Financing receivable, before allowance for credit loss, fee and loan in process | 2,699,151 | 2,761,775 |  |
Commercial | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 7,437 | 8,953 | 9,152 | 10,590
Financing receivable, before allowance for credit loss, fee and loan in process | 946,801 | 968,574 |  |
Commercial | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,413 | 1,440 | 1,972 | 1,792
Financing receivable, before allowance for credit loss, fee and loan in process | 149,229 | 146,861 |  |
Commercial | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,317 | 1,336 | 1,120 | 1,486
Financing receivable, before allowance for credit loss, fee and loan in process | 230,703 | 226,609 |  |
Residential |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 10,703 | 10,237 | 8,801 | 7,540
Financing receivable, before allowance for credit loss, fee and loan in process | 1,689,051 | 1,700,559 |  |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 45,540 | 46,098 |  |
Consumer | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 342 | 338 | 244 | 245
Financing receivable, before allowance for credit loss, fee and loan in process | 42,896 | 43,549 |  |
Consumer | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 70 | 68 | $ 78 | $ 84
Financing receivable, before allowance for credit loss, fee and loan in process | 2,644 | 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 | 225 | 211 |  |
Loans individually analyzed | 1,504 | 928 |  |
Loans collectively evaluated | 17,850 | 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 | 64 | 70 |  |
Loans individually analyzed | 323 | 333 |  |
Loans collectively evaluated | 3,492 | 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 | 62 | 9 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 4,852 | 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 | 99 | 132 |  |
Loans individually analyzed | 1,156 | 570 |  |
Loans collectively evaluated | 3,771 | 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 | 1,851 | 3,417 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 44,796 | 45,103 |  |
Loans individually analyzed | 36,408 | 41,699 |  |
Loans collectively evaluated | 5,704,713 | 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 | 342 | 326 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 25,248 | 26,036 |  |
Loans individually analyzed | 16,266 | 19,114 |  |
Loans collectively evaluated | 2,682,885 | 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 | 1,407 | 3,001 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 5,966 | 5,882 |  |
Loans individually analyzed | 14,598 | 16,207 |  |
Loans collectively evaluated | 928,388 | 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 | 36 | 20 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,315 | 1,411 |  |
Loans individually analyzed | 437 | 252 |  |
Loans collectively evaluated | 143,940 | 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 | 1,317 | 1,336 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 224,968 | 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 | 66 | 70 |  |
Loans acquired with deteriorated credit quality collectively evaluated | 10,538 | 10,032 |  |
Loans individually analyzed | 5,085 | 6,101 |  |
Loans collectively evaluated | 1,679,039 | 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 | 342 | 338 |  |
Loans individually analyzed | 22 | 25 |  |
Loans collectively evaluated | 42,849 | 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 | $ 2,644 | $ 2,549 |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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