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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Mortgage-backed securities with a book value | $ 237,410,000 |  | $ 237,410,000 |  | $ 245,052,000
Fair Value | $ 208,098,000 |  | $ 208,098,000 |  | 220,906,000
Percentage of equity securities | 10.00% |  | 10.00% |  |
Repurchase agreements | $ 9,938,000 |  | $ 9,938,000 |  | 9,244,000
Gross gains from sales of available for sale securities |  |  | 0 | $ 0 |
Gross losses from sales of available for sale securities |  |  | 183,000 | 0 |
Tax benefit to net realized gains (losses) | 52,000 | $ 0 | 52,000 | $ 0 |
Investments in debt and marketable equity securities | $ 197,809,000 |  | $ 197,809,000 |  | $ 209,133,000
Temporarily impaired debt securities percentage of investment securities portfolio | 95.00% |  | 95.00% |  | 95.00%
Asset Pledged as Collateral with Right [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Carrying value of securities pledged as collateral | $ 110,870,000 |  | $ 110,870,000 |  | $ 125,209,000
Maturity Overnight [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Repurchase agreements | 9,900,000 |  | 9,900,000 |  |
Mortgage-backed Securities - GSE Residential [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Mortgage-backed securities with a book value | 206,631,000 |  | 206,631,000 |  | 210,367,000
Fair Value | 180,078,000 |  | 180,078,000 |  | 188,185,000
Investments in debt and marketable equity securities | 173,232,000 |  | 173,232,000 |  | 181,629,000
Debt Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investments in debt and marketable equity securities | 197,809,000 |  | 197,809,000 |  | 209,133,000
Small Business Administration [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Mortgage-backed securities with a book value | 18,366,000 |  | 18,366,000 |  | 17,960,000
Fair Value | 16,176,000 |  | 16,176,000 |  | 16,442,000
Investments in debt and marketable equity securities | $ 16,176,000 |  | $ 16,176,000 |  | $ 14,983,000

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