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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance $ (21,648) $ (17,346)
Other comprehensive (loss) income before reclassification (5,121) (5,688)
Net current period other comprehensive (loss) income 2 (1)
Ending balance (26,767) (23,035)
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 (5,121) (5,688)
Net current period other comprehensive (loss) income 0 0
Ending balance (26,836) (22,951)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance 67 (83)
Other comprehensive (loss) income before reclassification 0 0
Net current period other comprehensive (loss) income 2 (1)
Ending balance $ 69 $ (84)