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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | $ 1,299,353 | $ 1,385,316
Fair Value, Measurements, Nonrecurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 17,721 | 21,031
Fair Value, Measurements, Nonrecurring | Residential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 449 | 2,035
Total assets |  | 178
Fair Value, Measurements, Nonrecurring | Commercial loans | Multi-family mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 7,300 | 7,517
Fair Value, Measurements, Nonrecurring | Commercial loans | Nonresidential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 9,972 | 11,479
Total assets | 12,956 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring | Residential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 0 | 0
Total assets |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring | Commercial loans | Multi-family mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring | Commercial loans | Nonresidential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 0 | 0
Total assets | 0 |
Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 1,299,353 | 1,385,316
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring | Residential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 0 | 0
Total assets |  | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring | Commercial loans | Multi-family mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring | Commercial loans | Nonresidential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 0 | 0
Total assets | 0 |
Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 17,721 |
Total assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable |  | 21,031
Total assets | 17,721 | 21,031
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Residential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 449 | 2,035
Total assets |  | 178
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Commercial loans | Multi-family mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 7,300 | 7,517
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Commercial loans | Nonresidential mortgage |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Net loans receivable | 9,972 | $ 11,479
Total assets | $ 12,956 |

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