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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
Mar. 31, 2025
Jun. 30, 2024
Less than 12 Months, Fair Value $ 13,060 $ 1,988
Less than 12 Months, Unrealized Losses (185) (5)
12 Months or More, Fair Value 167,155 183,664
12 Months or More, Unrealized Losses (24,637) (29,084)
Total, Fair Value 180,215 185,652
Total, Unrealized Losses (24,822) (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 1,786 6,609
12 Months or More, Unrealized Losses (198) (370)
Total, Fair Value 1,786 6,609
Total, Unrealized Losses (198) (370)
Mortgage-backed: GSE residential [Member]    
Less than 12 Months, Fair Value 10,795 945
Less than 12 Months, Unrealized Losses (173) (1)
12 Months or More, Fair Value 153,314 162,525
12 Months or More, Unrealized Losses (22,566) (26,360)
Total, Fair Value 164,109 163,470
Total, Unrealized Losses (22,739) (26,361)
Small Business Administration [Member]    
Less than 12 Months, Fair Value 1,237 0
Less than 12 Months, Unrealized Losses (11) 0
12 Months or More, Fair Value 12,055 14,086
12 Months or More, Unrealized Losses (1,873) (2,301)
Total, Fair Value 13,292 14,086
Total, Unrealized Losses (1,884) (2,301)
State and political subdivisions [Member]    
Less than 12 Months, Fair Value 1,028 1,043
Less than 12 Months, Unrealized Losses (1) (4)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 1,028 1,043
Total, Unrealized Losses $ (1) $ (4)