OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($)	6 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
OTHER COMPREHENSIVE INCOME
Net gains included in net income	$ (165,000)	$ 5,645,000	$ 5,645,000
Labor and Related Expense	15,893,000	14,381,000	29,225,000	$ 27,421,000
Tax expense	2,811,000	1,712,000	4,149,000	5,907,000
Net of tax	(9,600,000)	(6,611,000)	(15,260,000)	(21,948,000)
Amount Reclassified from Accumulated Other Comprehensive Loss
OTHER COMPREHENSIVE INCOME
Net of tax	(251,000)	4,170,000	4,148,000	(12,000)
Amount Reclassified from Accumulated Other Comprehensive Loss | Unrealized Gains/Losses on Securities
OTHER COMPREHENSIVE INCOME
Net gains included in net income	165,000	(5,645,000)	(5,645,000)
Tax expense	(43,000)	1,475,000	1,475,000
Net of tax	(122,000)	$ 4,170,000	4,170,000
Amount Reclassified from Accumulated Other Comprehensive Loss | Defined benefit plans
OTHER COMPREHENSIVE INCOME
Tax expense	(46,000)		(8,000)	(4,000)
Net of tax	(129,000)		(22,000)	(12,000)
Amount Reclassified from Accumulated Other Comprehensive Loss | Net actuarial gain
OTHER COMPREHENSIVE INCOME
Labor and Related Expense	$ 175,000		$ 30,000	$ 16,000