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Changes in Accumulated Other Comprehensive Income (Loss) (AOCI) by Component - Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains (losses) on available-for-sale securities $ (171) $ (275)
Tax expense 1,600 2,043
Net Income 4,660 5,784
Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified amount before tax 39 207
Tax expense 11 59
Net Income 28 148
Accumulated Net Realized Investment Gains (Losses) [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains (losses) on available-for-sale securities (171) (275)
Amortization of Defined Benefit Pension Items [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Actuarial losses $ 210 $ 482