Mortgage Servicing Rights (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Mortgage Servicing Rights [Abstract]
Residential Mortgage Loans Serviced	$ 2,100,000		$ 2,100,000			$ 1,950,000
Mortgage servicing rights	19,327	$ 0	19,327	$ 0	$ 18,162	$ 16,688	$ 0	$ 16
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets	2,800		8,900
Amortization of Mortgage Servicing Rights (MSRs)	695	0	2,657	164
Valuation allowance provision	$ (3)	$ 0	$ (850)	$ 0