Income Taxes - Reconciliation of Income Tax Expense at the Statutory Rate (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Taxes Paid, Net [Abstract]
Computed at the statutory rate (34%)	$ 450	$ 505	$ 1,788	$ 1,324
Decrease resulting from
Tax exempt interest	(12)	(13)	(36)	(38)
Cash surrender value of life insurance	(23)	(22)	(68)	(68)
State income taxes	49	59	214	142
Other	15	13	44	37
Actual expense	$ 479	$ 542	$ 1,942	$ 1,397