Income Taxes - Reconciliation of income tax expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Tax at statutory rate	$ 3,192	$ 2,024	$ 5,866	$ 4,083
Other, net	18	(20)	15	(45)
Actual provision	3,153	1,921	5,900	3,896
Increase (reduction) in taxes
Nontaxable municipal income	(108)	(113)	(211)	(226)
State tax, net of Federal benefit	261	87	502	196
Cash surrender value of Bank-owned life insurance	(205)	(53)	(263)	(106)
Tax credit benefits	$ (5)	$ (4)	$ (9)	$ (6)