Mortgage Servicing Rights (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Mortgage Servicing Rights [Abstract]
Residential Mortgage Loans Serviced	$ 2,240,000		$ 2,240,000			$ 2,150,000
Mortgage servicing rights	16,824	$ 18,162	16,824	$ 18,162	$ 17,186	$ 19,351	$ 16,436	$ 16,688
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets	1,500	1,400	2,900	2,700
Amortization of Mortgage Servicing Rights (MSRs)	1,333	1,110	2,601	1,962
Valuation allowance provision (reversal)	$ 380	$ (909)	$ 2,254	$ (847)