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Securities - Association's Investments Gross Unrealized Investment Losses and Fair Value of Association's Investments with Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | ---
Less than 12 Months, Fair Value | $ 0 | $ 1,988
Less than 12 Months, Unrealized Losses | 0 | (5)
12 Months or More, Fair Value | 181,210 | 183,664
12 Months or More, Unrealized Losses | (22,464) | (29,084)
Total, Fair Value | 181,210 | 185,652
Total, Unrealized Losses | (22,464) | (29,089)
U.S. Treasury [Member] |  |
Less than 12 Months, Fair Value |  | 0
Less than 12 Months, Unrealized Losses |  | 0
12 Months or More, Fair Value |  | 444
12 Months or More, Unrealized Losses |  | (53)
Total, Fair Value |  | 444
Total, Unrealized Losses |  | (53)
U.S. Government and Federal Agency [Member] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 5,763 | 6,609
12 Months or More, Unrealized Losses | (220) | (370)
Total, Fair Value | 5,763 | 6,609
Total, Unrealized Losses | (220) | (370)
Mortgage-backed: GSE residential [Member] |  |
Less than 12 Months, Fair Value | 0 | 945
Less than 12 Months, Unrealized Losses | 0 | (1)
12 Months or More, Fair Value | 162,563 | 162,525
12 Months or More, Unrealized Losses | (20,495) | (26,360)
Total, Fair Value | 162,563 | 163,470
Total, Unrealized Losses | (20,495) | (26,361)
Small Business Administration [Member] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 12,884 | 14,086
12 Months or More, Unrealized Losses | (1,749) | (2,301)
Total, Fair Value | 12,884 | 14,086
Total, Unrealized Losses | (1,749) | (2,301)
State and political subdivisions [Member] |  |
Less than 12 Months, Fair Value |  | 1,043
Less than 12 Months, Unrealized Losses |  | (4)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Total, Fair Value |  | 1,043
Total, Unrealized Losses | $ 0 | $ (4)

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