Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets [Abstract]
Allowance for loan losses	$ 4,284	$ 3,450
Pension benefits	337	190
Other benefit plans	2,995	2,454
Total deferred tax assets	7,616	6,094
Deferred tax liabilities [Abstract]
Depreciation	958	903
Loan costs	914	831
Real estate investment trust income	2,774	2,553
Unrealized gains on securities	673	345
Other	218	204
Total deferred tax liabilities	5,537	4,836
Net deferred tax asset included in prepaid expenses and other assets	$ 2,079	$ 1,258