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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, 2022
Jun. 30, 2022
Less than 12 Months, Fair Value $ 124,419 $ 169,518
Less than 12 Months, Unrealized Losses (12,668) (16,877)
12 Months or More, Fair Value 79,538 39,615
12 Months or More, Unrealized Losses (19,434) (7,323)
Total Fair Value 203,957 209,133
Total, Unrealized Losses (32,102) (24,200)
US Treasury [Member]    
Less than 12 Months, Fair Value 2,932 3,400
Less than 12 Months, Unrealized Losses (57) (83)
12 Months or More, Fair Value 432 0
12 Months or More, Unrealized Losses (64) 0
Total Fair Value 3,364 3,400
Total, Unrealized Losses (121) (83)
U.S. Government and Federal Agency [Member]    
Less than 12 Months, Fair Value 8,854 9,121
Less than 12 Months, Unrealized Losses (633) (367)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 8,854 9,121
Total, Unrealized Losses (633) (367)
Mortgage-backed Securities - GSE Residential [Member]    
Less than 12 Months, Fair Value 102,542 144,042
Less than 12 Months, Unrealized Losses (11,120) (15,267)
12 Months or More, Fair Value 72,885 37,587
12 Months or More, Unrealized Losses (18,074) (6,962)
Total Fair Value 175,427 181,629
Total, Unrealized Losses (29,194) (22,229)
Small Business Administration [Member]    
Less than 12 Months, Fair Value 9,012 12,955
Less than 12 Months, Unrealized Losses (850) (1,160)
12 Months or More, Fair Value 6,221 2,028
12 Months or More, Unrealized Losses (1,296) (361)
Total Fair Value 15,233 14,983
Total, Unrealized Losses (2,146) (1,521)
State and Political Subdivisions [Member]    
Less than 12 Months, Fair Value 1,079  
Less than 12 Months, Unrealized Losses (8)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 1,079  
Total, Unrealized Losses $ (8) $ 0