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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
Dec. 31, 2022
Jun. 30, 2022
Less than 12 Months, Fair Value $ 94,938 $ 169,518
Less than 12 Months, Unrealized Losses (6,720) (16,877)
12 Months or More, Fair Value 102,871 39,615
12 Months or More, Unrealized Losses (22,692) (7,323)
Total Fair Value 197,809 209,133
Total, Unrealized Losses (29,412) (24,200)
US Treasury [Member]    
Less than 12 Months, Fair Value 1,485 3,400
Less than 12 Months, Unrealized Losses (15) (83)
12 Months or More, Fair Value 437 0
12 Months or More, Unrealized Losses (59) 0
Total Fair Value 1,922 3,400
Total, Unrealized Losses (74) (83)
U.S. Government and Federal Agency [Member]    
Less than 12 Months, Fair Value 2,861 9,121
Less than 12 Months, Unrealized Losses (129) (367)
12 Months or More, Fair Value 3,618 0
12 Months or More, Unrealized Losses (367) 0
Total Fair Value 6,479 9,121
Total, Unrealized Losses (496) (367)
Mortgage-backed Securities - GSE Residential [Member]    
Less than 12 Months, Fair Value 82,025 144,042
Less than 12 Months, Unrealized Losses (5,982) (15,267)
12 Months or More, Fair Value 91,207 37,587
12 Months or More, Unrealized Losses (20,670) (6,962)
Total Fair Value 173,232 181,629
Total, Unrealized Losses (26,652) (22,229)
Small Business Administration [Member]    
Less than 12 Months, Fair Value 8,567 12,955
Less than 12 Months, Unrealized Losses (594) (1,160)
12 Months or More, Fair Value 7,609 2,028
12 Months or More, Unrealized Losses (1,596) (361)
Total Fair Value 16,176 14,983
Total, Unrealized Losses $ (2,190) $ (1,521)