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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance $ (21,648) $ (17,346)
Other comprehensive loss before reclassification 146 (1,630)
Amounts reclassified from accumulated other comprehensive income 0 123
Net current period other comprehensive loss 1 (4)
Ending balance (21,501) (18,857)
Unrealized Gains and Losses on Available-for- Sale Securities [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance (21,715) (17,263)
Other comprehensive loss before reclassification 146 (1,630)
Amounts reclassified from accumulated other comprehensive income 0 123
Net current period other comprehensive loss 0 0
Ending balance (21,569) (18,770)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance 67 (83)
Other comprehensive loss before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive loss 1 (4)
Ending balance $ 68 $ (87)