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Investment Securities - Borrowings (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Short-Term Debt [Line Items]    
Total available borrowing capacity across all sources $ 476.9 $ 514.2
Impairment losses on investment securities 0.0 0.0
Federal Home Loan Bank Advances    
Short-Term Debt [Line Items]    
Federal Home Loan Bank advances, unused borrowing facility 287.9 310.3
Federal Reserve Bank Advances | Discount Window Facility    
Short-Term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 139.0 153.9
Securities held as collateral 150.3 180.6
Advances outstanding 0.0 0.0
Federal Funds Purchased    
Short-Term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 50.0 50.0
Advances outstanding $ 0.0 $ 0.0