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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance $ (17,346) $ 1,933
Other comprehensive income before reclassification (4,574) (19,821)
Amounts reclassified from accumulated other comprehensive income 122 197
Net current period other comprehensive income 150 345
Ending balance (21,648) (17,346)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance (17,263) 2,361
Other comprehensive income before reclassification (4,574) (19,821)
Amounts reclassified from accumulated other comprehensive income 122 197
Ending balance (21,715) (17,263)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance (83) (428)
Net current period other comprehensive income 150 345
Ending balance $ 67 $ (83)