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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)