Available for Sale Securities - Investments Pledged as Collateral to Secure Public Deposits and Securities Sold Under Agreements to Repurchase (Details) - Pledged as collateral - Public deposits - USD ($) $ in Millions	Mar. 31, 2023	Jun. 30, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 243.6	$ 198.3
Asset backed securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	99.1	126.3
Collateralized Mortgage Obligations
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	111.5	27.3
US States and Political Subdivisions Debt Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	24.4	42.3
Other Debt Obligations [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 8.6	$ 2.4