Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Unrealized Losses on Securities Available-for-sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (17,414)	$ (18,193)	$ (19,182)	$ (20,531)
Other comprehensive income (loss) before reclassification	2,755	(1,347)	4,523	991
Amounts reclassified to net loss on sale of securities available-for-sale	487		487
Other comprehensive income (loss)	3,242	(1,347)	5,010	991
Balance	(14,172)	(19,540)	(14,172)	(19,540)
Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(528)	(877)	(528)	(877)
Other comprehensive income (loss) before reclassification	0	0	0	0
Amounts reclassified to net loss on sale of securities available-for-sale	0		0
Other comprehensive income (loss)	0	0	0	0
Balance	(528)	(877)	(528)	(877)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(17,942)	(19,070)	(19,710)	(21,408)
Other comprehensive income (loss) before reclassification	2,755	(1,347)	4,523	991
Amounts reclassified to net loss on sale of securities available-for-sale	487		487
Other comprehensive income (loss)	3,242	(1,347)	5,010	991
Balance	$ (14,700)	$ (20,417)	$ (14,700)	$ (20,417)