Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets [Abstract]
Allowance for loan losses	$ 5,257	$ 4,284
Pension benefits	138	337
Other benefit plans	3,584	2,995
Total deferred tax assets	8,979	7,616
Deferred tax liabilities [Abstract]
Depreciation	998	958
Net loan costs	220	914
Real estate investment trust income	2,907	2,774
Unrealized gains on securities	192	673
Other	245	218
Total deferred tax liabilities	4,562	5,537
Net deferred tax asset included in prepaid expenses and other assets	$ 4,417	$ 2,079