INCOME TAXES - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Deferred tax assets
Allowance for loan losses	$ 6,480	$ 6,481
Net operating loss carryforward		217
OTTI - securities	325	334
Post-retirement benefit obligations	494	493
Unrealized losses on securities available for sale	4,849	3,847
Deferred compensation	137	253
Unfunded defined benefit and postretirement benefit plan liabilities		109
Contribution carryforward	173	453
Lease liabilities	1,621
Other	688	696
Total deferred tax assets	14,767	12,883
Deferred tax liabilities
Depreciation	(1,839)	(2,053)
Net deferred loan origination costs	(560)	(527)
Prepaid pension	(2,404)	(2,604)
Prepaid expenses	(236)	(220)
Unfunded defined benefit and postretirement benefit plan assets	(1,463)
ROU assets	(1,551)
Other	(1,495)	(835)
Total deferred tax liabilities	(9,548)	(6,239)
Net deferred tax asset at end of year	$ 5,219	$ 6,644