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Securities - Investments Pledged as Collateral to Secure Public Deposits and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Jun. 30, 2021
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 $ 181.3 $ 155.6
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 104.1  
Mortgage-Backed Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
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   95.4
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 31.5 18.8
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 $ 45.7 $ 41.4