Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets:
Loan origination fees	$ 184	$ 100
Allowance for loan losses	809	788
Deferred director's fees	278	289
Deferred compensation	470	525
Deferred pension		613
Purchase accounting adjustments	811	1,552
NOL carry forward	1,022	1,090
Net unrealized loss on securities	19
Other	138
Total deferred tax assets	3,731	4,957
Deferred tax liabilities:
Net unrealized gain on securities		(21)
Premises and equipment	(157)	(114)
Other		(5)
Total deferred tax liabilities	(157)	(140)
Net deferred tax asset	$ 3,574	$ 4,817