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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, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains (losses) on available-for-sale securities $ (275) $ 320
Tax expense 2,043 2,034
Net Income 5,784 5,347
Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified amount before tax 207 648
Tax expense 59 186
Net Income 148 462
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 (275) 320
Amortization of Defined Benefit Pension Items [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Actuarial losses $ 482 $ 328