Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value Measurements [Abstract]
Impaired loans carrying amount	$ 17.1	$ 19.7
Impaired loans measured at fair value	13.5	13.2
Impaired loans life to date impairment	3.6	6.5
Impairment charge of other real estate assets	0.0	0.0
Servicing Asset at Fair Value, Amount	4.5	4.2
Servicing Asset at Amortized Cost	3.5	3.5
Impairment charges	$ 0.0	$ 0.0