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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance $ (20,559) $ (21,648)
Other comprehensive loss before reclassification 2,982 146
Amounts reclassified from accumulated other comprehensive income 51 0
Net current period other comprehensive loss (4) 1
Ending balance (17,530) (21,501)
Unrealized Gains and Losses on Available-for- Sale Securities [Member]    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance (20,768) (21,715)
Other comprehensive loss before reclassification 2,982 146
Amounts reclassified from accumulated other comprehensive income 51 0
Net current period other comprehensive loss 0 0
Ending balance (17,735) (21,569)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance 209 67
Other comprehensive loss before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive loss (4) 1
Ending balance $ 205 $ 68