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Commitments and Contingencies (Narratives) (Details) - USD ($)
$ in Millions
Jan. 01, 2020
Mar. 31, 2021
Dec. 31, 2020
Commitments and Contingencies [Abstract]      
Increase (Decrease) In Off-Balance Sheet Allowance $ 0.2    
Allowance For Credit Losses For Off-Balance Sheet   $ 1.2 $ 1.1
Contingency loss accrued liability   7.8 8.1
Other non-credit commitments   $ 11.9 $ 9.0