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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, 2025
Jun. 30, 2025
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value $ 9,607 $ 9,129
Less than 12 Months, Unrealized Losses (85) (113)
12 Months or More, Fair Value 161,382 164,276
12 Months or More, Unrealized Losses (20,761) (23,093)
Total, Fair Value 170,989 173,405
Total, Unrealized Losses (20,846) (23,206)
U.S. Government and federal agency    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 916 1,812
12 Months or More, Unrealized Losses (77) (174)
Total, Fair Value 916 1,812
Total, Unrealized Losses (77) (174)
Mortgage-backed: GSE residential [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 8,387 7,887
Less than 12 Months, Unrealized Losses (68) (100)
12 Months or More, Fair Value 148,871 150,592
12 Months or More, Unrealized Losses (19,043) (21,152)
Total, Fair Value 157,258 158,479
Total, Unrealized Losses (19,111) (21,252)
Small Business Administration [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 1,220 1,242
Less than 12 Months, Unrealized Losses (17) (13)
12 Months or More, Fair Value 11,595 11,872
12 Months or More, Unrealized Losses (1,641) (1,767)
Total, Fair Value 12,815 13,114
Total, Unrealized Losses $ (1,658) $ (1,780)