Securities - Security owned and pledged as collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Security Owned and Pledged as Collateral, Fair Value	$ 150,300	$ 156,100
State and political subdivisions
Security Owned and Pledged as Collateral, Fair Value	34,900	32,000
Mortgage-backed securities
Security Owned and Pledged as Collateral, Fair Value	85,500	82,000
Collateralized Mortgage Obligations
Security Owned and Pledged as Collateral, Fair Value	28,900	41,900
Other securities
Security Owned and Pledged as Collateral, Fair Value	$ 1,000	$ 200