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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, 2023
Jun. 30, 2023
Less than 12 Months, Fair Value $ 13,575 $ 16,728
Less than 12 Months, Unrealized Losses (493) (506)
12 Months or More, Fair Value 175,175 178,090
12 Months or More, Unrealized Losses (37,042) (29,889)
Total, Fair Value 188,750 194,818
Total, Unrealized Losses (37,535) (30,395)
U.S. Treasury [Member]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 430 438
12 Months or More, Unrealized Losses (67) (59)
Total, Fair Value 430 438
Total, Unrealized Losses (67) (59)
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 6,427 6,477
12 Months or More, Unrealized Losses (550) (499)
Total, Fair Value 6,427 6,477
Total, Unrealized Losses (550) (499)
Mortgage-backed: GSE residential [Member]    
Less than 12 Months, Fair Value 12,377 14,517
Less than 12 Months, Unrealized Losses (441) (440)
12 Months or More, Fair Value 154,201 158,413
12 Months or More, Unrealized Losses (33,554) (26,994)
Total, Fair Value 166,578 172,930
Total, Unrealized Losses (33,995) (27,434)
Small Business Administration [Member]    
Less than 12 Months, Fair Value 1,198 1,148
Less than 12 Months, Unrealized Losses (52) (60)
12 Months or More, Fair Value 13,070 12,762
12 Months or More, Unrealized Losses (2,854) (2,337)
Total, Fair Value 14,268 13,910
Total, Unrealized Losses (2,906) (2,397)
State and political subdivisions [Member]    
Less than 12 Months, Fair Value 0 1,063
Less than 12 Months, Unrealized Losses 0 (6)
12 Months or More, Fair Value 1,047 0
12 Months or More, Unrealized Losses (17) 0
Total, Fair Value 1,047 1,063
Total, Unrealized Losses $ (17) $ (6)