Mortgage Servicing Rights (Valuation allowance) (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
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]
Valuation allowance	$ 2,349	$ 3	$ 2,349	$ 3	$ 1,969	$ 95	$ 912	$ 850
Valuation allowance provision (reversal)	$ 380	$ (909)	$ 2,254	$ (847)