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Changes in Accumulated Other Comprehensive Income (Loss) (AOCI) by Component - Amounts Reclassified from Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gains (losses) on available-for-sale securities	$ 0	$ 0	$ (71)	$ 0
Tax expense	380	243	1,061	465
Net Income	1,011	708	2,863	1,359
Amounts Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Actuarial losses	(1)	(1)	(5)	2
Total reclassified amount before tax	(1)	(1)	(76)	2
Tax expense	0	0	(21)	1
Net Income	(1)	(1)	(55)	1
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

X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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