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Loans Receivable - Schedule of Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Jun. 30, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 6,001,107 | $ 5,436,576
Unaccreted yield adjustments | (16,974) | (18,731)
Loans receivable | 5,984,133 | 5,417,845
Commercial Loan |  |
Accounts, Notes, Loans and Financing Receivable [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 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 2,851,721 | 2,409,090
Commercial Loan | Nonresidential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,017,341 | 1,019,838
Commercial Loan | Commercial business |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 177,530 | 176,807
Commercial Loan | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 186,663 | 140,131
One-to Four-Family Residential Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 1,719,514 | 1,645,816
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 48,338 | 44,894
Consumer Loans | Home equity loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 45,690 | 42,028
Consumer Loans | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, before allowance for credit loss, fee and loan in process | $ 2,648 | $ 2,866

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