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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance $ (21,648) $ (17,346)
Other comprehensive (loss) income before reclassification 1,667 (3,825)
Amounts reclassified from accumulated other comprehensive loss 0 131
Net current period other comprehensive loss 2 (2)
Ending balance (19,979) (21,042)
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) income before reclassification 1,667 (3,825)
Amounts reclassified from accumulated other comprehensive loss 0 131
Net current period other comprehensive loss 0 0
Ending balance (20,048) (20,957)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance 67 (83)
Other comprehensive (loss) income before reclassification 0 0
Amounts reclassified from accumulated other comprehensive loss 0 0
Net current period other comprehensive loss 2 (2)
Ending balance $ 69 $ (85)