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Loans Receivable - Contractual Payment Status of Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Jun. 30, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 6,001,107 | $ 5,436,576
Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 21,598 | 41,756
30-59 days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,193 | 8,825
60-89 days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,779 | 3,401
90 days and over |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 15,626 | 29,530
Not Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,979,509 | 5,394,820
Commercial Loan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,233,255 | 3,745,866
Commercial Loan | Multi-family mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,851,721 | 2,409,090
Commercial Loan | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,017,341 | 1,019,838
Commercial Loan | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 177,530 | 176,807
Commercial Loan | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 186,663 | 140,131
Commercial Loan | 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 | 7,663 | 13,992
Commercial Loan | Past Due | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 5,900 | 22,158
Commercial Loan | Past Due | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 469 | 310
Commercial Loan | Past Due | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 0 | 0
Commercial Loan | 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 | 3,148
Commercial Loan | 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 | 204 | 4,026
Commercial Loan | 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 | 204 | 98
Commercial Loan | 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 Loan | 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 | 0 | 3,056
Commercial Loan | 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 | 0 | 0
Commercial Loan | 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 | 57
Commercial Loan | 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 Loan | 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 | 7,663 | 7,788
Commercial Loan | 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 | 5,696 | 18,132
Commercial Loan | 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 | 265 | 155
Commercial Loan | 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 | 0 | 0
Commercial Loan | Not 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 | 2,844,058 | 2,395,098
Commercial Loan | Not Past Due | Nonresidential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,011,441 | 997,680
Commercial Loan | Not Past Due | Commercial business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 177,061 | 176,497
Commercial Loan | Not Past Due | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 186,663 | 140,131
One-to Four-Family Residential Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,719,514 | 1,645,816
One-to Four-Family Residential Mortgage | Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 7,388 | 5,233
One-to Four-Family Residential Mortgage | 30-59 days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 3,634 | 1,525
One-to Four-Family Residential Mortgage | 60-89 days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,775 | 253
One-to Four-Family Residential Mortgage | 90 days and over |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,979 | 3,455
One-to Four-Family Residential Mortgage | Not Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,712,126 | 1,640,583
Consumer Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 48,338 | 44,894
Consumer Loans | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 45,690 | 42,028
Consumer Loans | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,648 | 2,866
Consumer Loans | 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 | 178 | 63
Consumer Loans | 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 Loans | 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 | 151 | 28
Consumer Loans | 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 Loans | 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 | 4 | 35
Consumer Loans | 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 Loans | 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 | 23 | 0
Consumer Loans | 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 Loans | Not 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 | 45,512 | 41,965
Consumer Loans | Not Past Due | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 2,648 | $ 2,866

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