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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, 2023
Jun. 30, 2022
Less than 12 Months, Fair Value $ 34,757 $ 169,518
Less than 12 Months, Unrealized Losses (980) (16,877)
12 Months or More, Fair Value 158,880 39,615
12 Months or More, Unrealized Losses (25,465) (7,323)
Total Fair Value 193,637 209,133
Total, Unrealized Losses (26,445) (24,200)
US Treasury [Member]    
Less than 12 Months, Fair Value 0 3,400
Less than 12 Months, Unrealized Losses 0 (83)
12 Months or More, Fair Value 1,442 0
12 Months or More, Unrealized Losses (54) 0
Total Fair Value 1,442 3,400
Total, Unrealized Losses (54) (83)
U.S. Government and Federal Agency [Member]    
Less than 12 Months, Fair Value 1,949 9,121
Less than 12 Months, Unrealized Losses (46) (367)
12 Months or More, Fair Value 4,590 0
12 Months or More, Unrealized Losses (391) 0
Total Fair Value 6,539 9,121
Total, Unrealized Losses (437) (367)
Mortgage-backed securities – GSE residential [Member]    
Less than 12 Months, Fair Value 29,284 144,042
Less than 12 Months, Unrealized Losses (852) (15,267)
12 Months or More, Fair Value 140,627 37,587
12 Months or More, Unrealized Losses (23,178) (6,962)
Total Fair Value 169,911 181,629
Total, Unrealized Losses (24,030) (22,229)
Small Business Administration [Member]    
Less than 12 Months, Fair Value 2,454 12,955
Less than 12 Months, Unrealized Losses (76) (1,160)
12 Months or More, Fair Value 12,221 2,028
12 Months or More, Unrealized Losses (1,842) (361)
Total Fair Value 14,675 14,983
Total, Unrealized Losses (1,918) (1,521)
State and Political Subdivisions [Member]    
Less than 12 Months, Fair Value 1,070  
Less than 12 Months, Unrealized Losses (6)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 1,070  
Total, Unrealized Losses $ (6) $ 0