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Securities, Securities Pledged (Details) - Asset Pledged as Collateral [Member] - USD ($)
$ in Millions
Mar. 31, 2024
Jun. 30, 2023
Deposits in Excess of FDIC Insurance Limits [Member]    
Securities Pledged [Abstract]    
Securities, fair value $ 905.5 $ 904.8
Potential Borrowings at Federal Reserve Bank Discount Window [Member]    
Securities Pledged [Abstract]    
Securities, fair value $ 40.5 $ 20.8