Mortgage Servicing Rights (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Mortgage Servicing Rights [Abstract]
Residential Mortgage Loans Serviced	$ 2,390,000		$ 2,390,000			$ 2,150,000
Mortgage servicing rights	17,730	$ 19,327	17,730	$ 19,327	$ 16,824	$ 19,351	$ 18,162	$ 16,688
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets	1,500	900	4,300	3,600
Amortization of Mortgage Servicing Rights (MSRs)	1,377	695	3,978	2,657
Valuation allowance provision (reversal)	$ (360)	$ (3)	$ 1,894	$ (850)