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Securities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage-backed securities with a book value | $ 186,589 | $ 155,588
Fair Value | $ 189,891 | 162,394
Percentage of equity securities | 10.00% |
Carrying value of securities pledged as collateral | $ 96,429 | 66,186
Gross gains from sales of available for sale securities | 327 | 295
Gross losses from sales of available for sale securities | 7 | 28
Tax benefit to net realized gains (losses) | 92 | 76
Investments in debt and marketable equity securities | $ 85,118 | $ 24,574
Temporarily impaired debt securities percentage of investment securities portfolio | 45.00% | 16.00%
Mortgage-backed Securities - GSE Residential [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage-backed securities with a book value | $ 167,711 | $ 143,033
Fair Value | 170,415 | 148,855
Investments in debt and marketable equity securities | 79,162 | 24,513
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in debt and marketable equity securities | 85,118 | 24,574
Small Business Administration [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage-backed securities with a book value | 9,115 | 3,578
Fair Value | 9,190 | 3,640
Investments in debt and marketable equity securities | $ 5,956 | $ 61

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