OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OTHER COMPREHENSIVE INCOME
Tax expense	$ 3,296	$ (4,830)
Reclassification, net of tax	6,509	(19,016)
Amount Reclassified from Accumulated Other Comprehensive Loss
OTHER COMPREHENSIVE INCOME
Reclassification, net of tax	(696)	(557)
Amount Reclassified from Accumulated Other Comprehensive Loss | Unrealized gains/losses on securities
OTHER COMPREHENSIVE INCOME
Reclassification, before tax	138	6
Reclassification, tax benefit	(36)	(1)
Reclassification, net of tax	102	5
Amount Reclassified from Accumulated Other Comprehensive Loss | Defined Benefit Plan
OTHER COMPREHENSIVE INCOME
Reclassification, before tax	(1,080)	(760)
Reclassification, tax benefit	282	198
Reclassification, net of tax	$ (798)	$ (562)