Mortgage Servicing Rights (Narrative) (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Transfers and Servicing of Financial Assets [Abstract]
Residential Mortgage Loans Serviced for Third Parties	$ 2,700.0	$ 2,700.0	$ 2,900.0
Servicing income, including late and ancillary fees	$ 6.9	$ 7.2	$ 7.9