Loan Servicing (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 1,330,000	$ 1,270,000	$ 1,330,000
Serviced sold mortgage loans with recourse	3,600	4,900	4,100
Mortgage Loans Sold with Recourse, Reserve	287		$ 266
Servicing fees included in other service income	$ 900	$ 800