Other Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Short-Term Borrowings [Abstract]
Highest month-end balance	$ 7.2	$ 7.2
Daily average balance	6.0	6.4
Short-term borrowing collateralized by Mortgage-backed securities of government-sponsored entities	$ 9.1	$ 7.0