Shareholders' Equity (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Equity Additional Information [Table] [Line Items]
Trust preferred securities included in Tier 1 Capital	$ 22.0	$ 22.0
2020 Stock Repurchase Program
Equity Additional Information [Table] [Line Items]
2020 Repurchase Program, number of shares authorized	850,000
2020 Repurchase Program, authorized amount, percentage of common stock	5.00%
Treasury stock, shares acquired	0