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Changes in Accumulated Other Comprehensive Loss (AOCI) by Component - Amounts Reclassified from Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains (losses) on available-for-sale securities $ 0 $ 0 $ (71) $ 0
Tax expense (credit) 463 47 681 222
Net Income 1,219 185 1,852 651
Amounts Reclassified from AOCI [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified amount before tax (2) 1 (75) 3
Tax expense (credit) (1) 0 (21) 1
Net Income (1) 1 (54) 2
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 0 0 (71) 0
Amortization of Defined Benefit Pension Items [Member] | Amounts Reclassified from AOCI [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of defined benefit pension items: Actuarial losses $ (2) $ 1 $ (4) $ 3