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Investment Securities - Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Jun. 30, 2022
Federal Home Loan Bank Advances [Member]    
Short-Term Debt [Line Items]    
Federal Home Loan Bank advances, unused borrowing facility $ 228.6 $ 310.3
Federal Reserve Bank Advances | Discount Window Facility [Member]    
Short-Term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 146.8 168.4
Securities held as collateral 157.1 191.1
Advances outstanding 0.0 0.0
Federal Funds Purchased [Member]    
Short-Term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 50.0 50.0
Advances outstanding $ 0.0 $ 0.0