INCOME TAXES - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Deferred tax assets
Allowance for loan losses	$ 6,481	$ 7,393
Net operating loss carryforward	217
OTTI - securities	334	334
Post-retirement benefit obligations	493	486
Unrealized losses on securities available for sale	3,847
Deferred compensation	253	269
Unfunded defined benefit and postretirement benefit plan liabilities	109	1,872
Contribution carryforward	453	802
Other	696	733
Total deferred tax assets	12,883	11,889
Deferred tax liabilities
Depreciation	(2,053)	(2,329)
Net deferred loan origination costs	(527)	(506)
Prepaid pension	(2,604)	(2,800)
Prepaid expenses	(220)	(141)
Unrealized gains on securities available for sale		(58)
Other	(835)	(845)
Total deferred tax liabilities	(6,239)	(6,679)
Net deferred tax asset at end of year	$ 6,644	$ 5,210