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Allowance for Credit Losses - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | $ 44,939 | $ 48,734 | $ 47,058 | $ 58,165
Loans individually analyzed | 39,900 |  |  |
Total | 5,748,750 | 5,850,476 |  |
Unaccreted yield adjustments | (15,963) | (21,055) |  |
Total loans receivable, net of yield adjustments | 5,732,787 | 5,829,421 |  |
Commercial business | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 24,125 | 26,362 |  |
Total | 2,645,851 | 2,761,775 |  |
Commercial business | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 6,125 | 8,953 |  |
Total | 948,075 | 968,574 |  |
Commercial business | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 1,573 | 1,440 |  |
Total | 142,747 | 146,861 |  |
Commercial business | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 1,230 | 1,336 |  |
Total | 209,237 | 226,609 |  |
One- to four-family residential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 11,461 | 10,237 | 7,540 | 9,747
Total | 1,756,051 | 1,700,559 |  |
Consumer loans: |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total | 46,789 | 46,098 |  |
Consumer loans: | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 349 | 338 | 245 | 433
Total | 44,104 | 43,549 |  |
Consumer loans: | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 76 | 68 | $ 84 | $ 36
Total | 2,685 | 2,549 |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 9 | 3 |  |
Loans collectively evaluated | 132 | 211 |  |
Loans individually analyzed | 1,584 | 928 |  |
Loans collectively evaluated | 14,105 | 17,967 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 31 | 70 |  |
Loans individually analyzed | 284 | 333 |  |
Loans collectively evaluated | 2,145 | 3,562 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 6 | 9 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 2,794 | 4,237 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 5,735 | 5,735 |  |
Receivables Acquired with Deteriorated Credit Quality | One- to four-family residential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 9 | 3 |  |
Loans collectively evaluated | 95 | 132 |  |
Loans individually analyzed | 1,276 | 570 |  |
Loans collectively evaluated | 3,431 | 4,433 |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer loans: | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 24 | 25 |  |
Loans collectively evaluated | 0 | 0 |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer loans: | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans 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] |  |  |  |
Loans individually analyzed | 853 | 3,417 |  |
Loans collectively evaluated | 43,945 | 45,103 |  |
Loans individually analyzed | 38,293 | 41,699 |  |
Loans collectively evaluated | 5,694,768 | 5,789,882 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 326 |  |
Loans collectively evaluated | 24,125 | 26,036 |  |
Loans individually analyzed | 22,591 | 19,114 |  |
Loans collectively evaluated | 2,623,260 | 2,742,661 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 517 | 3,001 |  |
Loans collectively evaluated | 5,577 | 5,882 |  |
Loans individually analyzed | 9,539 | 16,207 |  |
Loans collectively evaluated | 936,107 | 948,472 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 228 | 20 |  |
Loans collectively evaluated | 1,339 | 1,411 |  |
Loans individually analyzed | 714 | 252 |  |
Loans collectively evaluated | 139,239 | 142,372 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 1,230 | 1,336 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 203,502 | 220,874 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | One- to four-family residential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 108 | 70 |  |
Loans collectively evaluated | 11,249 | 10,032 |  |
Loans individually analyzed | 5,429 | 6,101 |  |
Loans collectively evaluated | 1,745,915 | 1,689,455 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans: | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 349 | 338 |  |
Loans individually analyzed | 20 | 25 |  |
Loans collectively evaluated | 44,060 | 43,499 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans: | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 76 | 68 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | $ 2,685 | $ 2,549 |  |

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