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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 6 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains (losses) on available-for-sale securities $ (183) $ 0 $ (183) $ 0
Tax expense 486 629 1,226 1,292
Net Income 1,404 1,704 3,373 3,595
Amounts Reclassified from AOCI [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified amount before tax (184) (14) (186) (21)
Tax expense (52) (4) (53) (6)
Net Income (132) (10) (133) (15)
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 (183) 0 (183) 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 $ (1) $ (14) $ (3) $ (21)