Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets [Abstract]
Allowance for loan losses	$ 3,142	$ 4,220
Pension benefits	146	310
Other benefit plans	1,388	1,957
Total deferred tax assets	4,676	6,487
Deferred tax liabilities [Abstract]
Depreciation	919	1,392
Loan costs	763	1,051
Real estate investment trust income	2,253	3,052
Unrealized gains on securities	3	379
Other	189	224
Total deferred tax liabilities	4,127	6,098
Net deferred tax asset included in prepaid expenses and other assets	$ 549	$ 389