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Income Taxes - Reconciliation of Income Tax Expense at the Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Taxes Paid, Net [Abstract]
Computed at the statutory rate	$ 1,236	$ 1,019
Increase (decrease) resulting from
Tax exempt interest	(16)	(26)
Cash surrender value of life insurance	(57)	(56)
State income taxes	441	329
Other	35	27
Income tax expense	$ 1,639	$ 1,293
Tax rate as a percentage of pre-tax income	27.90%	26.70%

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