Income Taxes - Reconciliation of Income Tax Expense at the Statutory Rate to Actual Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 7,231	$ 7,550	$ 8,074
Other, net	63	(41)	(370)
Actual provision	6,887	7,047	7,803
Increase (reduction) in taxes
Nontaxable Municipal Income	(444)	(400)	(441)
State tax, net of Federal benefit	299	487	553
Cash surrender value of Bank-owned life insurance	(214)	(279)	(266)
Tax Credit Benefits	$ (48)	$ (270)	(871)
Adjustment of deferred tax asset for enacted changes in tax laws			$ 1,124