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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
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized gains (losses) on available-for-sale securities $ (114) $ (71)  
Tax expense (credit) 512 218  
Net Income 1,392 $ 633  
Amounts Reclassified from AOCI [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassified amount before tax (113)   $ (73)
Tax expense (credit) (32)   (20)
Net Income (81)   (53)
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 (114)   (71)
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 $ 1   $ (2)