Mortgage Servicing Rights (Narrative) (Details 1) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Transfers and Servicing of Financial Assets [Abstract] | |||
Residential Mortgage Loans Serviced for Third Parties | $ 2,900.0 | $ 2,700.0 | $ 2,700.0 |
Servicing income, including late and ancillary fees | $ 7.1 | $ 6.9 | $ 7.2 |