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Deposits and Related Interest (Narratives) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Deposits and Related Interest [Abstract]    
Weighted Average Rate Domestic Deposit 0.77% 0.86%
Time Deposits, $250,000 or More $ 670.4 $ 692.1
Public funds deposit 308.2 278.7
Public Fund Collateral Investments 322.2 320.8
Accrued Interest, Time Deposits 8.0 11.7
Bank Overdrafts 1.3 1.0
Brokered Certificates of Deposits 66.6 222.1
Brokered Money Market Deposit $ 29.5 $ 21.4