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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Chairman, Board of Directors          
Related Party Transaction [Line Items]          
Payments for life insurance policies $ 0.7 $ 0.7 $ 0.7 $ 0.7  
Chief Executive Officer          
Related Party Transaction [Line Items]          
Payments for life insurance policies 0.5 $ 0.5 0.5 $ 0.5  
Executive Officers          
Related Party Transaction [Line Items]          
Life insurance assets, carrying amount $ 23.4   $ 23.4   $ 22.2