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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, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance $ (16,264) $ (20,559)
Other comprehensive income before reclassification 1,713 4,703
Amounts reclassified from accumulated other comprehensive loss 82 51
Net current period other comprehensive income (loss) 1 (2)
Ending balance (14,468) (15,807)
Unrealized Gains and Losses on Available-for- Sale Securities [Member]    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance (16,541) (20,768)
Other comprehensive income before reclassification 1,713 4,703
Amounts reclassified from accumulated other comprehensive loss 82 51
Net current period other comprehensive income (loss) 0 0
Ending balance (14,746) (16,014)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance 277 209
Other comprehensive income before reclassification 0 0
Amounts reclassified from accumulated other comprehensive loss 0 0
Net current period other comprehensive income (loss) 1 (2)
Ending balance $ 278 $ 207