Income Taxes - Reconciliation of income tax expense at statutory rate (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax at statutory rate													$ 12,580	$ 12,538	$ 7,231
Nontaxable municipal income													349	453	444
State tax, net of Federal benefit													812	1,018	299
Cash surrender value of Bank-owned life insurance													245	378	214
Tax credit benefits													(45)	(11)	(48)
Other, net													(18)	(189)	63
Income Tax Expense (Benefit), Total	$ 3,602	$ 2,358	$ 3,288	$ 3,487	$ 3,529	$ 3,096	$ 3,153	$ 2,747	$ 1,861	$ 1,129	$ 1,921	$ 1,976	$ 12,735	$ 12,525	$ 6,887