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Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Mortgage-backed securities with a book value | $ 144,896 |  | $ 144,896 |  | $ 144,905
Fair Value | $ 146,807 |  | $ 146,807 |  | 146,291
Percentage of equity securities | 10.00% |  | 10.00% |  |
Carrying value of securities pledged as collateral | $ 66,434 |  | $ 66,434 |  | 57,921
Repurchase agreements | 3,340 |  | 3,340 |  | 2,015
Gross gains from sales of available for sale securities |  |  | 21,000 |  |
Gross losses from sales of available for sale securities |  |  | 28,000 |  |
Tax benefit to net realized gains (losses) | (2) | $ 0 | (2) | $ 0 |
Sales of available-for-sale securities | (8) |  | (7) | $ 0 |
Investments in debt and marketable equity securities | $ 37,552 |  | $ 37,552 |  | $ 47,146
Temporarily impaired debt securities percentage of investment securities portfolio | 26.00% |  | 26.00% |  | 32.00%
Maximum [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Repurchase agreements term |  |  | 90 days |  |
Minimum [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Repurchase agreements term |  |  | 30 days |  |
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 | 1,600 |  | 1,600 |  |
U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Mortgage-backed securities with a book value | 10,665 |  | 10,665 |  | $ 12,654
Fair Value | 11,070 |  | 11,070 |  | 12,950
Mortgage-backed Securities - GSE Residential [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Mortgage-backed securities with a book value | 128,984 |  | 128,984 |  | 124,615
Fair Value | 130,387 |  | 130,387 |  | 125,510
Investments in debt and marketable equity securities | 33,744 |  | 33,744 |  | 46,216
Debt Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investments in debt and marketable equity securities | $ 37,552 |  | $ 37,552 |  | $ 47,146

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