Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Pledged Securities sold under Agreement to repurchase	$ 10.1	$ 14.2
FHLB Advance [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	194.3
Correspondent Banks [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	21.0
Federal Reserve Bank Discount Window [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 40.9