Investment Securities (Narrative) (Details) $ in Millions	Jun. 30, 2021 USD ($) Investments	Dec. 31, 2020 Investments
Investment Securities (Textual)
Fair market value, less than 12 months, number of investments | Investments	30	26
Fair market value, less than 12 months | $	$ 30.8
Fair market value, 12 months or longer, number of investments | Investments	12
Fair market value, 12 months or longer | $	$ 11.3