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Deposits and Related Interest (Narratives) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Deposits and Related Interest [Abstract]    
Weighted Average Rate Domestic Deposit 0.66% 0.80%
Time Deposits, $250,000 or More $ 573.3 $ 628.4
Public funds deposit 217.8 218.9
Public Fund Collateral Investments 246.9 242.8
Accrued Interest, Time Deposits 1.2 1.5
Bank Overdrafts 1.3 1.1
Brokered Certificates of Deposits 11.4 25.0
Brokered Money Market Deposit $ 23.6 $ 24.1