Securities - Security owned and pledged as collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Security Owned and Pledged as Collateral, Fair Value	$ 162,500	$ 156,100
State and political subdivisions
Security Owned and Pledged as Collateral, Fair Value	42,000	32,000
Mortgage-backed securities
Security Owned and Pledged as Collateral, Fair Value	120,500	123,900
Other securities
Security Owned and Pledged as Collateral, Fair Value	$ 0	$ 200