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Investment Securities (Narrative) (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Investments
Dec. 31, 2020
Investments
Investment Securities (Textual)    
Fair market value, less than 12 months, number of investments | Investments 43 26
Fair market value, less than 12 months | $ $ 53.9  
Fair market value, 12 months or longer, number of investments | Investments 18  
Fair market value, 12 months or longer | $ $ 17.6