Available for Sale Securities - Investments Pledged as Collateral to Secure Public Deposits and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Carrying value of investment and MBS pledged as collateral to secure public deposits and securities sold under agreements to repurchase	$ 191.8	$ 198.3
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Carrying value of investment and MBS pledged as collateral to secure public deposits and securities sold under agreements to repurchase	120.9	126.3
Collateralized Mortgage Obligations
Debt Securities, Available-for-sale [Line Items]
Carrying value of investment and MBS pledged as collateral to secure public deposits and securities sold under agreements to repurchase	27.1	27.3
US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale [Line Items]
Carrying value of investment and MBS pledged as collateral to secure public deposits and securities sold under agreements to repurchase	41.5	42.3
Other Debt Obligations
Debt Securities, Available-for-sale [Line Items]
Carrying value of investment and MBS pledged as collateral to secure public deposits and securities sold under agreements to repurchase	$ 2.3	$ 2.4