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Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Mortgage-backed securities with a book value | $ 148,711 |  | $ 148,711 |  |  | $ 144,905
Fair Value | $ 152,948 |  | $ 152,948 |  |  | 146,291
Percentage of equity securities | 10.00% |  | 10.00% |  |  |
Carrying value of securities pledged as collateral | $ 70,893 |  | $ 70,893 |  |  | 57,921
Repurchase agreements | 3,404 |  | 3,404 |  |  | 2,015
Gross gains from sales of available for sale securities |  |  | 167 |  |  |
Gross losses from sales of available for sale securities |  |  | 28 |  |  |
Tax benefit to net realized gains (losses) | $ 42 | $ 0 | $ 40 | $ 0 |  |
Investments in debt and marketable equity securities |  |  |  |  | $ 9,408 | $ 47,146
Temporarily impaired debt securities percentage of investment securities portfolio | 6.00% |  | 6.00% |  |  | 32.00%
Maturity Overnight [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Repurchase agreements | $ 1,700 |  | $ 1,700 |  |  |
Maturity 30 to 90 Days [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Repurchase agreements | 1,700 |  | 1,700 |  |  |
Mortgage-backed Securities - GSE Residential [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Mortgage-backed securities with a book value | 136,111 |  | 136,111 |  |  | $ 124,615
Fair Value | 139,640 |  | 139,640 |  |  | 125,510
Investments in debt and marketable equity securities |  |  |  |  | $ 7,336 | 46,216
Debt Securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Investments in debt and marketable equity securities | $ 9,408 |  | $ 9,408 |  |  | $ 47,146

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