Shareholders' Equity (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Trust preferred securities included in Tier 1 Capital	$ 22.0	$ 22.0
Stock Repurchase Program:
Authorized amount (in shares)	850,000
Authorized amount as a percentage of total common stock	5.00%
Cumulative amount of shares purchased	0
Dividends:
Amount of additional dividends the bank could have declared	$ 257.1
Reserved Shares:
Reserved shares available for grant	1,696,991