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Changes in Accumulated Other Comprehensive Income (AOCI) by Component - Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Tax expense $ 740 $ 663
Net Income 1,969 1,891
Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified amount before tax (2) (7)
Tax expense (1) (2)
Net Income (1) (5)
Accumulated Net Realized Investment Gains (Losses) [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains on available-for-sale securities 0 0
Amortization of Defined Benefit Pension Items [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Actuarial losses $ (2) $ (7)