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LOANS RECEIVABLE - Contractual Payment Status of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Jun. 30, 2025
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 5,781,244 | $ 5,814,539
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 49,235 | 43,411
30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,101 | 2,452
60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,236 | 8,656
90 Days and Over |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 42,898 | 32,303
Current |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,732,009 | 5,771,128
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 3,976,465 | 4,012,678
Commercial | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,555,001 | 2,709,654
Commercial | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,012,422 | 986,556
Commercial | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 201,277 | 138,755
Commercial | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 207,765 | 177,713
Commercial | Total Past Due | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 32,343 | 27,488
Commercial | Total Past Due | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 6,274 | 5,863
Commercial | Total Past Due | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 296 | 1,701
Commercial | Total Past Due | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,755 | 0
Commercial | 30-59 Days | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Commercial | 30-59 Days | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 896 | 926
Commercial | 30-59 Days | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 37 | 0
Commercial | 30-59 Days | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Commercial | 60-89 Days | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,521 | 5,270
Commercial | 60-89 Days | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 461 | 0
Commercial | 60-89 Days | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 400
Commercial | 60-89 Days | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Commercial | 90 Days and Over | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 30,822 | 22,218
Commercial | 90 Days and Over | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,917 | 4,937
Commercial | 90 Days and Over | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 259 | 1,301
Commercial | 90 Days and Over | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,755 | 0
Commercial | Current | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,522,658 | 2,682,166
Commercial | Current | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,006,148 | 980,693
Commercial | Current | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 200,981 | 137,054
Commercial | Current | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 205,010 | 177,713
Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,741,023 | 1,748,591
Residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 7,144 | 7,883
Residential | 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,964 | 1,350
Residential | 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 141 | 2,890
Residential | 90 Days and Over |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,039 | 3,643
Residential | Current |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,733,879 | 1,740,708
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 63,756 | 53,270
Consumer | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 61,379 | 50,737
Consumer | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,377 | 2,533
Consumer | Total Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 423 | 476
Consumer | Total Past Due | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Consumer | 30-59 Days | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 204 | 176
Consumer | 30-59 Days | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Consumer | 60-89 Days | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 113 | 96
Consumer | 60-89 Days | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Consumer | 90 Days and Over | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 106 | 204
Consumer | 90 Days and Over | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Consumer | Current | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 60,956 | 50,261
Consumer | Current | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 2,377 | $ 2,533

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