Securities (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged as collateral to secure public deposits	$ 43.7	$ 55.3
Fair value of investments, carried at less than historical costs	$ 49.8	$ 53.8
Percentage available for sale Securities in unrealized loss positions out of total available for sale securities	62.00%	52.00%