Income Taxes - Reconciliation of income tax expense at statutory rate (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax at statutory rate													$ 10,387	$ 12,580	$ 12,538
Nontaxable municipal income													(327)	(349)	(453)
State tax, net of Federal benefit													46	812	1,018
Cash surrender value of Bank-owned life insurance													(318)	(245)	(378)
Tax credit benefits													(19)	(45)	(11)
Other, net													457	(18)	(189)
TOTAL INCOME TAXES	$ 3,939	$ 578	$ 3,267	$ 2,442	$ 3,602	$ 2,358	$ 3,288	$ 3,487	$ 3,529	$ 3,096	$ 3,153	$ 2,747	$ 10,226	$ 12,735	$ 12,525