Loan Servicing (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 1,360,000	$ 1,310,000	$ 1,360,000	$ 1,310,000	$ 1,330,000
Serviced sold mortgage loans with recourse	3,200	4,300	3,200	4,300	4,100
Mortgage Loans Sold with Recourse, Reserve	266		266		$ 266
Servicing fees included in other service income	$ 800	$ 900	$ 2,600	$ 2,500