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, 2025	Jun. 30, 2024
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 291.3	$ 265.5
MBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	148.7	137.0
CMOs
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	107.3	103.5
Obligations of states and political subdivisions
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	31.7	20.8
Other securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 3.6	$ 4.3