Income Taxes - Reconciliation of income tax expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Tax at statutory rate	$ 3,056	$ 1,308	$ 8,922	$ 5,391
Other, net	1	(24)	15	(67)
Actual provision	3,096	1,129	8,996	5,026
Increase (reduction) in taxes
Nontaxable municipal income	(117)	(109)	(327)	(335)
State tax, net of Federal benefit	215	27	717	223
Cash surrender value of Bank-owned life insurance	(57)	(52)	(320)	(159)
Tax credit benefits	$ (2)	$ (21)	$ (11)	$ (27)