Servicing Rights (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Transfers and Servicing [Abstract]
Serviced unpaid principal balance	$ 222.0	$ 345.9
Unpaid principal balance for loans sold during period	368.3	600.0	$ 139.1
Servicing revenue	$ 1.2	$ 3.5	$ 0.9