Income Taxes - Schedule of reconciliation of the statutory federal income to the income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of the statutory federal income to the income tax expense
Federal income tax at statutory rate	$ 992	$ 198
State tax, net of federal benefit	47	7
Bank owned-life insurance	(99)	(74)
Gain on bargain purchase		(157)
Non-deductible merger expenses		71
Impact of tax law change		(408)
Other	7	(24)
Income tax expense (benefit)	$ 947	$ (387)
Reconciliation of the statutory federal income to the income tax expense (Percentage)
Federal income tax at statutory rate, percent	21.00%	21.00%
State tax, net of federal benefit, percent	1.00%	0.70%
Bank owned-life insurance, percent	(2.10%)	(7.90%)
Gain on bargain purchase, percent		(16.70%)
Non-deductible merger expenses, percent		7.50%
Impact of tax law change, percent		(43.30%)
Other, percent	0.10%	(2.40%)
Effective tax rate, percent	20.00%	(41.10%)